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Citrus Tree Protection From the Cold: How To Ensure Your Trees Survive When Temperatures Drop

Whether you’re nurturing a single citrus tree or raising a grove, ensuring optimal growth and health is a top priority.

Your soil is the perfect pH, proper nutrition has been applied at just the right intervals, and you’ve vigilantly guarded against pests. Now, with cold weather looming on the horizon, the focus is on how to protect your citrus trees from the cold. 

In this article, you’ll discover tips for citrus tree protection from cold weather, answers to common questions, and how to keep your citrus trees thriving from January through December.

Table of Contents

How Cold Will Citrus Trees Tolerate?

While cold hardiness varies widely by variety, in general, citrus trees can tolerate brief drops in temperatures down to 26°F to 28°F without suffering major damage.

Healthy, mature trees are able to withstand colder temperatures better than young ones. 

TreeSource Citrus Nursery is a full-service commercial citrus nursery, serving the California citrus industry and greenhouse growers around the world. Contact us today for more information or to place an order.

How To Protect Citrus Trees From the Cold: 5 Tips

#1: Know Your Zone

Your plant hardiness zone defines the expected minimum winter temperatures and frost threat, thus determining the level of protection your citrus trees require:

  • Zones 9–11 are optimal for most citrus trees, including oranges, limes, and lemons.
  • Zone 8 is fine for hardier citrus varieties like kumquats and satsuma mandarins, provided they are planted in a south-facing, sheltered location.
  • Zone 7 and below require trees to be grown in containers and moved inside during cold months.

#2: Use the Right Covering

Citrus tree protection from cold weather can consist of: 

  • Frost cloths
  • Burlap
  • Frost blankets
  • Cloth sheets
  • Specialized tree covers

Additional tips for citrus tree protection from the cold include: 

  • To trap heat effectively, ensure covers extend all the way to the ground.
  • Secure coverings with rocks or weights to trap rising heat. 
  • Avoid using plastic coverings directly on leaves, since temperature fluctuations can transfer heat and cause damage. 

#3: Create a Frame

Use a tomato cage or create a simple structure from wood stakes to keep covering fabric off leaves and prevent freeze damage where they touch.

#4: Water Adequately

Thoroughly water your citrus trees before freezing temperatures arrive. Moist soil is more efficient at absorbing and retaining heat than dry soil and provides the best possible insulation to the roots. 

It’s important, however, not to overwater, as waterlogged soil can damage the roots. In general, citrus trees require less water during the winter months than they do in the spring and summer.

#5: Use Heating Devices

Providing a heat source can help to protect citrus trees from cold weather, and may include: 

  • Micro-sprinklers and irrigation: These options are particularly helpful for larger trees or groves to create a layer of ice around the tree/s. As the water freezes, it releases latent heat that protects tree tissues.
  • Specialized tree wraps or heat tape: Wrap the trunks of young trees up to two feet from the base to protect them from freezing. 
  • Water barrels or heat sinks: Fill 55-60 gallon black drums with water and place them on the north/northwest side of each tree. The water absorbs heat throughout the day, then radiates it back at night.
  • Incandescent Christmas lights: Old-fashioned C9 jumbo bulbs provide a significant amount of heat. String the lights through the canopy and place a frost cover over the top. 

Cold protection is important not only in the field, but also while young citrus trees are being transported to growers in colder regions.

At TreeSource Citrus Nursery, shipments during winter and deliveries to colder regions include additional safeguards such as:

  • Scheduling shipments early in the week to minimize delays and shorten transit time.
  • Fully hydrating seedlings before shipment to maintain stable, greenhouse-like conditions during transport.
  • Closely monitoring weather patterns and adjusting shipping timelines when extreme cold is expected.

Post-Freeze Citrus Tree Care: What To Do After Temperatures Rise

Once the risk of freezing has passed, wait several weeks before pruning citrus trees.

Additional tips include:

  • Light irrigation once the soil has thawed
  • Avoid fertilizing immediately after a freeze
  • Monitor leaf drop

Commonly Asked Questions About Citrus Tree Protection From Cold

Which Citrus Trees Are Most Cold-Sensitive?

Citrus trees requiring the most protection from cold include:

  • Limes 
  • Lemons 
  • Citron

What Are the Key Factors in Citrus Tree Cold Sensitivity?

Variables affecting how sensitive a citrus tree is to the cold include:

  • The tree’s age: One- to two-year-old trees are considerably more susceptible to damage than mature trees.
  • The timing of cold weather: A tree that has not experienced a gradual decline in temperature is less freeze-hardy.
  • The duration of cold weather: Freezing temperatures extending 24 to 36 hours or more cause more damage than brief, overnight freezes.

Should I Prune My Citrus Trees Before Winter?

No. 

Since pruning encourages new growth that’s more susceptible to cold damage, for optimal citrus tree protection from cold, avoid heavy pruning before winter.

When Should I Start Protecting Citrus Trees From Cold Weather

Citrus tree protection from the cold should begin before the first freeze warning and follow these general thresholds:

  • Light protection at 32–35°F
  • Full protection below 28–30°F

Additional tips for the timing of protection include: 

  • Take note of regional forecasts and local extension alerts 
  • Focus on monitoring overnight lows, not daytime highs.
  • Microclimates, like low spots, open areas, and north-facing exposures, freeze first

What Are Signs of Cold Damage on Citrus Trees?

Symptoms of damage include:

  • Wilting, water-soaked, or blackening leaves
  • Leaf drop
  • Split bark
  • Fruit damage
  • Branch die-off (in extreme cases)

Can Plastic Be Used To Protect Citrus Trees From Cold?

While it’s not the best option for citrus tree protection from cold weather, plastic can be used, provided it doesn’t touch the leaves, since direct contact can result in frost damage. 

If you decide to use plastic, place a cloth layer underneath and remove it during the day to keep the trees from overheating.

Are Potted Citrus Trees Protected Differently Than In-Ground Trees?

Yes. 

Since the roots of potted citrus trees are less insulated, they are more susceptible to damage from cold temperatures. Move pots indoors or to a sheltered area.

Can Indoor Citrus Trees Be Affected By Cold Temperatures?

Yes. 

Indoor citrus trees can be negatively impacted by cold drafts that commonly occur near doors and windows. To encourage optimal health, place trees out of the path of cold air and maintain consistent indoor temperatures.

Should I Cover Citrus Trees Overnight During a Freeze?

Yes. 

If cold temperatures are expected, cover your citrus trees in the late afternoon before temperatures begin to drop. Remove the coverings before temperatures rise the following day to keep the trees from overheating.

How Long Can Citrus Trees Remain Covered During Cold Weather?

If temperatures are below freezing, citrus trees can remain covered for multiple consecutive nights, provided you:

  • Remove covers during the day once temperatures are above freezing
  • Provide ventilation during sunny days
  • Use breathable materials 

If temperatures rise and the trees remain covered, they may experience moisture accumulation and be at high risk of fungal infection.

Should Citrus Fruit Be Harvested Before a Freeze?

Yes. 

Harvest citrus fruit (especially lemons and limes) before a hard freeze to prevent splitting, rotting, or drying out. A light frost (30-32°F) is generally safe, but when temperatures are expected to drop below 27°F, ice crystals may form inside, ruining the crop and possibly damaging the tree.

Can Citrus Trees Recover From Cold Damage?

With proper care, many citrus trees can recover. Any necessary pruning should be put off until spring so you can clearly distinguish between damaged and living wood. Once pruning is complete, continue with the regular schedule of watering and fertilization.

TreeSource: Full-Service USDA/CDFA Certified Commercial Citrus Nursery Serving Greenhouse Growers Worldwide

TreeSource is the trusted destination for all your citrus tree needs.

Founded in 1999, we’re an industry leader in the innovation and development of modern citrus trees. Our stringent compliance standards allow us to ship almost anywhere in the U.S. by USDA/APHIS (FL & TX are coming soon!).

Our available citrus trees include: 

If you’re local or happen to be in the area, we invite you to join the TreeSource staff on a full tour of our nursery. We’re confident you’ll see why we’re the citrus industry leader.