10 Easy Ways to Protect Plants from Frost

Updated on October 31, 2018
The Dirt Farmer profile image

Jill volunteers at community gardens and learns about gardening through the MD Master Gardening and Master Naturalist programs.

From watering before a cold snap to using cloths to cover your plants, this article will share with you 10 easy ways to help protect your plants from the ravages of frost.
From watering before a cold snap to using cloths to cover your plants, this article will share with you 10 easy ways to help protect your plants from the ravages of frost. | Source

One day it's 65°F and sunny, and the next it's 32°F with snow on the ground. Yep, that's spring—a magical time of year filled with burgeoning life and fluctuating thermometers.

For many of us, spring presents one of the year's greatest gardening challenges: protecting tender new growth from damage due to cold. Frost damage, freezing death, root damage, and frost cracks on bark are four primary negative effects of severe drops in the temperature.

In early spring, when the threat of frost is especially great, closely monitoring weather conditions via weather radio, TV, and websites for reports of expected cold spells is imperative. That way, when frost is predicted, you can prepare for it. It's also a good idea to periodically check the temperature at ground level near your plants to see how cold it is for them and whether or not you need to do something about it.

This article will explain what frost is, how freezing temperatures affect plants and what you can do about it. It will also provide easy and effective suggestions for protecting plants from frost, methods that can be applied to tender food crops like tomatoes and citrus trees, delicate potted plants like succulents and begonias, as well as other plants susceptible to extreme cold. Read on to find out how to protect your green friends from frost damage, freezing temperatures and the cold hands of winter.

10 Easy Ways to Protect Plants From Frost

Here are 10 easy, practical methods I've used to reduce frost's impact on my garden:

  1. Choose cold-hardy plants
  2. Place plants in frost-resistant spots
  3. Avoid frost pockets
  4. Harden off seedlings
  5. Cover plants before nightfall
  6. Protect plants with cloches
  7. Warm plants with water jugs
  8. Water before a frost
  9. Bring potted plants indoors
  10. Wrap fruit trees

Continue reading to find out more details about how to apply these methods in your own garden.

Many varieties of pansy are cold hardy.
Many varieties of pansy are cold hardy. | Source

1. Choose Cold-Hardy Plants

Some vegetables and flowers are hardy souls that thrive in spite of (or sometimes because of) the cold. These kinds of plants are known as "hardy," because they can tolerate some amount of short-term freezing. By contrast, plants that are killed or severely injured by freezing temperatures are known as "tender."

Crocuses often push their way through snow to bloom, and a spring storm rarely gives narcissus, tulips, grape hyacinths, or pansies pause. There are also a wide range of tasty edibles that are resistant to frost, including

  • broccoli
  • cabbage
  • calendula (pot marigold)
  • carrots
  • chives
  • lettuce
  • leeks
  • peas
  • radish
  • spinach
  • Swiss chard

Experts at your local nursery are great sources of information about hardy plants appropriate to your zone. Native plants, particularly native perennials, will most likely be the best choices.

Which plants are sensitive to frost?

  • Tender plants such as avocados, fuchsia, bougainvillea, begonias, impatiens, geraniums and succulents
  • Edibles such as citrus trees, tropical plants, tomatoes, pumpkins, sweet potatoes, cucumber, okra, eggplant, corn and peppers
  • Spring-blooming shrubs and trees such as cherry, azalea and rhododendron
  • Tender perennials like canna, elephant ear, caladium and dahlia. (Before a killing frost, consider digging these plants up and storing them in a dry, cool place.)

Don't Strand Plants

Smart placement near other plants, benches, or walls—especially if these structures are south- or west-facing—will go a long way toward protecting plants from being damaged by frost.

2. Place Plants in Frost-Resistant Spots

It's as true for plants as it is for real estate: location, location, location. Set out seedlings and store-bought spring plants in areas that are less likely to experience damaging cold.

As cold air moves to lower ground, it will pass by plants located on high ground or slopes. That's why it's best to place seedlings and other plants that are susceptible to frost in these elevated locations.

Placing plants by benches, fences, and walls—particularly if they are south- or west-facing—can provide additional protection, especially if the structures are dark in color. During the day, the structures absorb heat. Throughout the night, they radiate that heat, keeping plants warmer than they'd otherwise be. Nearby shrubbery also provides protection from light frosts.

What is frost?

Frost generally occurs on clear and calm nights, where there are few to no clouds to reflect warmth back to the ground and little to no wind to disperse warmer patches of air. The cold air then settles down to the lowest point, while the hot air rises up and away from the ground.

On these nights, frost can happen even if the temperature on your thermometer does not read below freezing. As long as the air temperatures at ground level dip below 32°F, ice crystals can still form on plants. This in turn disrupts the movement of fluids within the plant, depriving its tissues of water and drying it out. This is why leaves damaged by frost shrivel up and turn dark brown or black. If left in freezing temperatures for long durations of time without much protection, plants can easily die from desiccation.

Note: Frost can also occur when there is wind, but it is a chilling wind that then brings in even colder air, making matters worse.

Dianthus can serve as a beautiful flowering ground cover, but don't plant it in a frost pocket if you want pretty blooms!
Dianthus can serve as a beautiful flowering ground cover, but don't plant it in a frost pocket if you want pretty blooms! | Source

3. Avoid Frost Pockets

Frost pockets are depressions in the ground. Cold air drains into these "pockets," and it can't get out. When this happens, plants located in the depressed areas can suffer frost damage. Avoid sowing seeds and bedding new plants in these low places.

Check the Ground-Level Temperature

Temperatures higher up may vary from those lower to the ground. In other words, just because an elevated thermometer reads above 32°F doesn't necessarily mean it isn't below that at ground level.

4. Harden Off Seedlings

Before setting out seedlings, acclimate them to the outdoors by gradually exposing them to conditions outside. This process, called hardening off, will help you grow stronger plants that are more likely to withstand the vicissitudes of early spring.

Begin the hardening off process about 14 days before transplanting. When the weather's mild and above 45°F, place the seedlings outside during the day in a warm, shady spot that's protected from the wind. At night, bring them indoors.

After two weeks, the seedlings will be stronger, sturdier plants, ready for transplanting.

To harden them off before transplanting, seedlings like these four o'clocks are set outside in a warm, shady spot.
To harden them off before transplanting, seedlings like these four o'clocks are set outside in a warm, shady spot. | Source

5. Cover Plants Before Nightfall

If you’re going to cover up your plants before a hard frost, do so before dusk. If you wait until darkness falls, most of the stored heat in your garden will have dissipated.

No matter what type of cover you use, make sure that it extends down to the soil on each side. Do not leave any openings for warmth to escape. If you can, it's also advisable to use stakes to keep material, especially plastic, from touching the foliage. Do not affix or gather your cover to the trunk, however, as this will prevent the heat radiating up out of the soil from reaching the plant. (See diagram below for proper covering.)

In the morning, after the frost has thawed, remove the covers. Failing to do so could cause the plant to break dormancy and start actively growing again, which would make it even more susceptible to frost damage in the future.

What can I cover my plants with to protect them from frost?

Here are just some of the items you can use to cover your tender plants:

  • bed sheets or blankets
  • drop cloths
  • an inverted flower pot or bucket
  • milk jugs with the bottom cut out
  • frost cloths (These can protect some plants to temperatures as low as 20°F.)
  • garden blankets, such as Reemay (These are good for garden rows or raised beds and will protect tender spring flowers and vegetables from cold en masse.)

It's also important to remember that covers don’t have to be elaborate or expensive in order to work. A row of sticks with newspaper, cardboard, or sheets and towels tented over them will do just fine. If you don’t have sticks, lay the covers directly over your plants. This too will prevent heat loss.

Make sure to place your covers completely over your plants and let them drape all the way to the ground—don't tie the cover to the trunk, otherwise the heat radiating up out of the soil won't be able to warm up your plant.
Make sure to place your covers completely over your plants and let them drape all the way to the ground—don't tie the cover to the trunk, otherwise the heat radiating up out of the soil won't be able to warm up your plant.

6. Protect Plants with Cloches

Strictly speaking, cloches are removable glass or plastic covers that protect plants from cold. Sometimes called bells or bell jars, most fit over individual plants, but some are large enough to cover a row. Like other covers, cloches should be placed over plants before the sun goes down and removed in the morning after the frost has thawed.

Glass cloches are highly ornamental. When you're not using them outside for frost protection, you can use them indoors over humidity-loving houseplants like violets.

You can also use plastic cloches, which are generally less expensive than glass ones. But because they are lightweight, they must be staked into the ground to prevent them from blowing away in high winds.

Note: Since cloches used for cold protection are temporary measures, you may opt to create your own makeshift versions. Flower pots, Mason jars, baskets, and milk jugs with the bottoms removed can all be placed over plants to shield them from freeze and frost.

Keep Cloches Staked Down

Stake lightweight cloches into the ground to prevent them from blowing over.

7. Warm Plants With Water Jugs

Fill plastic milk jugs with water and place them in the sun, allowing them to soak up heat during the day. Before dusk, set the jugs around your plants and throw a cover over them. The water in the jugs will lose heat more slowly than the soil and the air, and the warmth it emits will help protect your plants from the cold.

Sage in bloom against a background of Reemay over spring vegetables in our raised garden bed.
Sage in bloom against a background of Reemay over spring vegetables in our raised garden bed. | Source

8. Water Before a Frost

It may sound crazy, but watering around plants the night before a spring frost can actually protect them from freezing. During the night, the wet soil will release moisture into the air, which will raise the temperature and keep plants warmer.

Ground Hanging Baskets

Place hanging baskets on the ground before covering them so they can benefit from heat rising up from the soil.

9. Bring Potted Plants Indoors

When frost is predicted, bring planters and hanging baskets inside. The roots of potted plants experience more severe temperature fluctuations than those planted in the ground. They'll reach lower temperatures, too. That's why potted plants are especially susceptible to root damage due to cold. It can cause their roots—particularly those near the edge of the pot—to turn spongy and black. Although root damage may not kill the plant, it will stunt its growth.

Just make sure when you bring potted plants inside that they don't have any insects or pests on them and aren't currently suffering from any diseases. This will not only potentially exacerbate the problem, but it could also infect your other plants.

If you opt to cover a hanging basket rather than bring it inside, place it on the ground first, and then place the cover over the basket in order to take advantage of the ground's relative warmth.

10. Wrap Fruit Trees

If you grow fruit trees, be sure to wrap the trunks in the fall with burlap strips or tree wrap. Most fruit trees have thin barks that are susceptible to splitting when temperatures fluctuate dramatically. Tree wrap will prevent this splitting, which is known as frost crack.

It's often a good idea to use multiple layers of cloth or weatherproof paper, while still keeping the wrapping a bit loose. This provides more effective insulation. You should also extend the wrapping all the way to the ground and at least as high up as the lower limbs or branches. (See diagram below for proper technique.)

If necessary, this wrapping can be left on for the majority of the winter season.

When wrapping the trunk of a fruit tree, it's wise to use multiple layers of cloth—while still keeping the wrapping a bit loose—and extend the wrapping from all the way down to the ground to at least as high as the lowest limbs.
When wrapping the trunk of a fruit tree, it's wise to use multiple layers of cloth—while still keeping the wrapping a bit loose—and extend the wrapping from all the way down to the ground to at least as high as the lowest limbs.

Frequently Asked Questions

Here is some additional information regarding questions frequently asked about how to protect your plants from frost:

What factors affect the chances that a plant will die from frost?

  • Cloud coverage: If there are more clouds in the sky to absorb and reflect heat back down to the earth, then your plants will stand a better chance of fending off frosts.
  • Wind: Without enough wind to mix the rising warm air with the falling cold air, your plants will be more susceptible to the cold of the night.
  • Humidity: Higher humidity raises the dew point and helps slow the rate of temperature change, decreasing the likelihood that frost will form on your plants. (This explains why dry deserts can shift from high heat to freezing cold so quickly.)
  • Soil properties: The sun warms the soil during the day, and this heat then radiates out into the cooler atmosphere of the night. If your soil is deep, loose, heavy, and fertile, then it will release more moisture into the air. By contrast, thin, sandy, or nutrient-poor soil will not release as much moisture. Additionally, heavily mulched soil will prevent more moisture from releasing into the atmosphere, thus providing less protection on colder nights.
  • Proximity of structures and other plants: Without other nearby plants and structures to provide shelter from cold winds and radiate back heat to your plants, they will be more vulnerable to frost.
  • Age of the plant: Younger plants that are still actively growing or flowering will be more vulnerable to colder temperatures.

What are the different kinds of frost and what do they mean?

The following table breaks down the different kinds of freezes and frosts, as well as the potential effects for plants exposed to even a few hours of freezing temperatures:

Types of Frosts and Freezes and Their Effects

Temperature
Type or Name
Effects on Plants
Around 29–32°F
Light Freeze/Light Frost
Ice forms on the outside. Will likely only significantly harm or kill tender plants.
Around 25–29°F
Moderate Freeze/Kiling Frost
Ice forms on the inside of the plant, which causes plant cells to burst. Will cause significant destruction to most foliage and vegetation. Fruit blossoms and semi-hardy plants will suffer extensive damage and potentially death. Even root-hardy perennials will be hurt.
Below 25°F
Severe Freeze
Will cause severe damage to most all plants, leading to desiccation and death.

What are the first and last frost dates for my area?

The last frost date in the spring and the first frost date in the fall indicate how long your growing season will be. You need to know these dates so that you can determine when to start seeds indoors and when to purchase and plant nursery plants.

For freeze and frost dates in the U.S., you can visit the Farmer's Almanac or the National Oceanic and Atmospheric Administration (NOAA). Freeze-date tables, as well as other frost/freeze information, are also available through your local state cooperative extension office.

What do I do if I see frost damage?

Just because you see frost damage does not necessarily mean you need to take any drastic action. Many plants can be surprisingly resilient and might very well bounce back come springtime.

Your best bet is to wait until the weather begins to get warmer again (usually around March) and see if any new leaves sprout.

Should I prune frost-damaged growth?

It is definitely not advisable to begin pruning frost-damaged growth until the spring for a variety of reasons:

  • Those damaged limbs and leaves will continue to trap heat within the canopy and help the plant make it through the winter.
  • Damage is often not as bad as it may seem at first glance, and new growth may yet still emerge out of an area you might have thought was already dead.
  • Pruning damaged limbs might stimulate new growth from your plant, and that new growth will be especially susceptible to frost (as well as your entire plant).

Only once new growth has sprouted from your plant in the following spring should you begin to prune dead or damaged limbs.

What doesn't help protect plants from frost?

Though you might have heard that these methods are effective, the following are almost certain to make matters worse:

  • Large fires: This creates an updraft of hot air above the plants, which they cannot access. It also sucks in cold air from surrounding areas that could make the ground temperature even colder for your plants.
  • Mulching: Though this can be of temporary help for situations such as trying to keep your deciduous fruit tree from prematurely breaking dormancy, it not only prevents the soil from capturing heat from the sun but also blocks much of that heat from rising up from that soil to help warm your plant. (If you do decide to use mulch for a short cold period, be sure to remove it once the danger of frost is over.)

In general, spring bulbs like daffodils, tulips and anemones (pictured), which are planted in autumn, are cold-hardy plants that don't require additional frost protection.
In general, spring bulbs like daffodils, tulips and anemones (pictured), which are planted in autumn, are cold-hardy plants that don't require additional frost protection. | Source

How do you protect plants from frost?

See results

Works Cited

  1. Bradley, Lucy (1998, April). Frost Protection. University of Arizona Extension. Retrieved on 19 October 2018.
  2. Mason, Sandra. Anticipating Frost - What to Do with Frost Sensitive Plants. University of Illinois Extension. Retrieved on 19 October 2018.
  3. Brown, Faith. How to Protect Plants from Frost. University of California, Division of Agriculture and Natural Resources. Retrieved on 19 October 2018.
  4. Day, Julie. How to Protect Your Garden from Frost and Freeze. Today's Homeowner. Retrieved on 19 October 2018.

Questions & Answers

© 2011 Jill Spencer

Comments

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    • The Dirt Farmer profile imageAUTHOR

      Jill Spencer 

      8 months ago from United States

      I'll hope for the best, too, Deborah!

    • profile image

      Deborah Riley 

      8 months ago

      Will water my wildflowers tonight and pray they will be ok! SC

    • The Dirt Farmer profile imageAUTHOR

      Jill Spencer 

      9 months ago from United States

      Thanks for commenting, Gregg and Lily! Hope your plants are doing well.

    • profile image

      Gregg Friedman MD 

      12 months ago

      I have to bring in my potted Red Lipstick Palm anytime the temperature drops below 60 degrees F. Thanks for your tips with dealing with low temperatures. By Gregg L. Friedman MD

    • profile image

      Lily 

      13 months ago

      I found your inventions of the jugs are extremely useful. Thank you for sharing :-)

    • The Dirt Farmer profile imageAUTHOR

      Jill Spencer 

      16 months ago from United States

      Hi Sarah! Wet the soil around your seedlings well before nightfall. Then cover them baskets, bowls, etc.-- homemade cloches. If you cover your seedlings with cloth or newspaper, be sure to stake the covering up with sticks and then weight the edges with rocks to prevent the little plants from getting squashed by the cover. Remove the covering the next morning. Good luck to you!

    • profile image

      sarah 

      16 months ago

      I need your help!!I have little seedlings and we are getting huge frost's and I don't know what to do, because we do not live anywhere near a town and I am not keen on going to town. What would be the best option to save my seedlings??

    • The Dirt Farmer profile imageAUTHOR

      Jill Spencer 

      23 months ago from United States

      Yes, I've heard of people who have orchards using those. Thanks for the suggestion! --Jill

    • profile image

      Jerry 

      23 months ago

      What about using propane heaters, like the old 'smudge pots'?

    • The Dirt Farmer profile imageAUTHOR

      Jill Spencer 

      2 years ago from United States

      Hi Tina. I don't know! Are you going to protect them from the frost? Try one of the strategies above. The easiest is probably to throw something over them before night falls. Good luck to you!

    • profile image

      Tina Whitt 

      2 years ago

      We have a freeze warning...will my poppies be okay they are pretty big...thanks

    • The Dirt Farmer profile imageAUTHOR

      Jill Spencer 

      2 years ago from United States

      Hi eugbug! Thanks for your comments and for sharing the article. The bubble wrap method sounds like a great way to repurpose, and the hot water bottles sound a lot like the milk jug idea. Use what you have, huh? I'm so glad we have not had extended freezes here. I'm sure you were heartsick over the losses, esp. the orange tree. Even our native plants, I think, would be hard pressed to survive a long period of temps that low. Thanks again for stopping by! Jill

    • eugbug profile image

      Eugene Brennan 

      2 years ago from Ireland

      This is very useful Jill, so I'll tweet it! Bubblewrap is supposed to be good for wrapping plants but anything fleecy that doesn't soak up water and lose its insulating properties is equally good. I've used some hot water bottles on occasions for keeping plants warm on cold nights!

      I lost several shrubs including a fig, olive and camelia during the winter of 2010 when temperatures dropped to -15 C (5F) during an extended snowy period. My biggest loss was a 25 year old orange tree which I had grown from a pip. Citrus trees usually withstand some frost damage, but if temperatures are sub-zero day and night for weeks on end (which was the case here in 2010) even plants under cover will probably freeze. Maybe those heating cables which are used for frost protection of pipes would be worth trying out?

    • The Dirt Farmer profile imageAUTHOR

      Jill Spencer 

      4 years ago from United States

      Hi S.M. Thanks for leaving a comment. An old aquarium would make a great makeshift cloche. What a wonderful way to repurpose! All the best,

      Jill

    • profile image

      S.M. 

      4 years ago

      You can throw an empty aquarium over the plants too. A lot of gardeners are fish addicts too! We have a few tanks around as emergency spares. Lucky people that have a 33gal. or bigger, it's 36 inches long and 16-18" deep. :)

      There are often second hand tanks that go for cheap at lawn sales, especially if they have a crack. :)

    • The Dirt Farmer profile imageAUTHOR

      Jill Spencer 

      5 years ago from United States

      Thanks, kikalina! I need to get out and take some new pics now. Our crocuses are blooming and the daffodils are just about to open. Can't wait! All the best, Jill

    • kikalina profile image

      kikalina 

      5 years ago from Europe

      Amazing photos. Great hub.

    • The Dirt Farmer profile imageAUTHOR

      Jill Spencer 

      5 years ago from United States

      Hi purl3agony! Don't fret about the snow too much. Unless it was so heavy that it broke down your plants, snow will keep the ground warm and protect plants. (Scrape it away, and you might see green underneath!) It's hard frosts and thaws that do the real damage.

      Hi John! Doh! I should have mentioned leaves. I use them in our herb garden, which is away from the house, but not in the surrounding flowerbeds as they attract mice and, subsequently, ticks. Nice to hear from you, John! Think I'll add your idea to the hub. Thanks! --Jill

    • johnr54 profile image

      Joanie Ruppel 

      5 years ago from Texas

      We also use leaves to cover our plants. I have purchased old sheets at garage sales and use them as covers in case an early frost is in the air.

    • purl3agony profile image

      Donna Herron 

      5 years ago from USA

      Pinning this now, but wish I had studied this before our first snow last week :( I'll be ready for next year :)

    • The Dirt Farmer profile imageAUTHOR

      Jill Spencer 

      5 years ago from United States

      Appreciate the support, Prasetio. Thanks!

    • prasetio30 profile image

      prasetio30 

      5 years ago from malang-indonesia

      Very informative hub. I love gardening and you have wonderful tips here. Thanks for writing and share with us. Voted up!

      Prasetio

    • The Dirt Farmer profile imageAUTHOR

      Jill Spencer 

      5 years ago from United States

      Hi ytsenoh. Good timing, huh? Stay warm--and thanks for reading! --Jill

    • ytsenoh profile image

      Cathy 

      5 years ago from Louisiana, Idaho, Kauai, Nebraska, South Dakota, Missouri

      In light of the snow we just had (!!!), I love this hub. You do such a great job with your images and always well-written. Thank you.

    • The Dirt Farmer profile imageAUTHOR

      Jill Spencer 

      5 years ago from United States

      Thanks, Peggy! I well remember how warm it was all year long when I lived in Texas. I actually missed the cold weather and would have given anything for a good snow. Still, sometimes I'd like to be able to grow tropical plants outside. (: Take care, Jill

    • Peggy W profile image

      Peggy Woods 

      5 years ago from Houston, Texas

      I well remember those snowbound days when living in Wisconsin. In Houston we only had to cover our more tropical plants less than 10 times for predicted frosts this past winter and our average last day is generally the end of February. We just use old sheets. I'll be able to wash them up soon and store them in our shed for next winter. Your tip of watering before a freeze is valid. Even fruit grove owners do that to help protect their crops. Good hub! Up, useful, interesting and will share. Beautiful photos!

    • The Dirt Farmer profile imageAUTHOR

      Jill Spencer 

      5 years ago from United States

      Thanks for your comments, Glimmer Twin Fan! I updated this to improve the layout and add a few new pictures. Covering, uncovering, racing around--whew! Spring can be a wild ride for gardeners! --Jill (:

    • Glimmer Twin Fan profile image

      Claudia Mitchell 

      5 years ago

      Saw this on pinterest and had to read. Written before I joined hubpages. This is great for me. Last spring we covered and uncovered a dozen times. Especially my peonies. This is really useful. Taking my daughter to the busstop this am I saw my snowdrops poking through the ice. Gave me hope that spring is on it's way.

    • The Dirt Farmer profile imageAUTHOR

      Jill Spencer 

      7 years ago from United States

      Oh, no! Another snowbound gardener. I'm sure you are sick of the cold. Thanks for reading! --DF

    • moonlake profile image

      moonlake 

      7 years ago from America

      Enjoyed your hub. We still have to much snow will be awhile before we can start planting. Please no more snow storms we're sick of winter.

    • The Dirt Farmer profile imageAUTHOR

      Jill Spencer 

      7 years ago from United States

      Wow, and I thought we had it bad here in MD, where a snowstorm is supposed to hit us again on April 1. Hope you see green soon!

    • Bob Ewing profile image

      Bob Ewing 

      7 years ago from New Brunswick

      Still a foot of snow in the backyard, nothing peeping out yet, good tips here, though.

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