Is Burlap Good for Frost Protection? | What It Actually Does

Burlap is effective for frost protection as a windbreak and barrier against ice, snow, and sun scald, but it does not significantly raise the temperature inside the wrap.

Most gardeners wrap their prized shrubs the night before a freeze expecting the burlap to trap heat like a blanket. That assumption is the most expensive mistake you can make with this material. Burlap is excellent at stopping wind from stripping moisture from leaves and at shielding tender branches from heavy ice, but it won’t keep a non-hardy plant alive through a hard freeze. Knowing what burlap actually does—and doesn’t do—is the difference between saving your investment and finding brown foliage in spring.

What Burlap Does During a Freeze

Burlap works primarily as a physical barrier, not a thermal insulator. On a clear, calm night when temperatures dip below freezing, the air temperature inside a burlap wrap will reach equilibrium with the outside air within minutes. Gardening Know How’s guide on wrapping plants in burlap explains that the cover’s real job is to block the wind that causes winter burn—the browning and dieback that happens when cold wind pulls moisture out of leaves faster than roots can replace it.

Burlap also catches snow and ice, preventing heavy accumulations from snapping branches. And in late summer and fall, a single layer draped over tomatoes or peppers blocks 50–80% of sunlight, reducing sun scald on fruit as they ripen.

Burlap vs. Plastic vs. Frost Cloth: How It Stacks Up

The key difference is breathability. Plastic traps moisture and can create a greenhouse effect that overheats plants on sunny winter days, then freezes that moisture against the foliage overnight. Burlap lets air circulate, which prevents that cycle. But none of these materials will protect a lemon tree or a non-hardy fuchsia that can’t survive below freezing regardless of coverage.

How to Wrap Plants in Burlap the Right Way

Getting it wrong means wasting your effort or even damaging the plant. The correct process involves stakes, space, and a double layer.

Step 1: Drive Stakes Around the Plant

Place three or four wooden stakes into the ground 2–4 inches away from the plant’s outermost foliage. The stakes should be tall enough to support the burlap above the top of the plant by several inches. This air gap is what prevents frozen burlap from contacting and damaging leaves.

Step 2: Use a Double Layer of 10 oz Burlap

Standard lightweight landscape burlap won’t cut it. Look for “sack weight” or “10 oz” burlap—the tighter weave provides the density that actually blocks wind and sheds ice. Fold the fabric so you have two layers over the plant.

Step 3: Drape and Secure

Gently lay the burlap over the stakes so it rests on the stakes, not on the leaves. Attach the fabric to the stakes with a staple gun or tight knot. Leave the bottom edge loose enough that air can still move through the space between the burlap and the soil.

Step 4: Cover the Soil Area

Fold the excess burlap at the bottom outward and spread it around the base of the plant, or add a thick layer of mulch over the root zone. This step is critical: plants don’t generate internal heat, so the cover must help insulate the ground to retain any warmth radiating up from the soil.

Step 5: Remove as Soon as Weather Improves

Pull the burlap off when temperatures rise above freezing. Leaving it on for days traps humidity against the leaves and invites fungal problems. Leave the stakes in place through spring so you can quickly re-cover during a late cold snap.

If you’re ready to buy the right material for the job, our tested picks for the best burlap tree protection covers the 10 oz rolls and pre-made wraps that nurseries actually trust.

When Burlap Fails Completely

Burlap is useless if you skip the fundamentals. Here are the situations where it does nothing or makes things worse.

Non-hardy plants. A lemon tree or fuchsia won’t survive a hard freeze no matter how many layers you stack. Burlap only protects plants that would make it through winter with some help—it doesn’t change a plant’s cold hardiness zone.

No soil insulation under the cover. Wrapping the top of a plant while leaving the root zone exposed to freezing air is the most common mistake. The ground is the only real heat source; if the cover doesn’t extend over the soil surface or you haven’t mulched, the plant will freeze from the roots up.

Wet, freezing conditions. Burlap absorbs water. If you apply it during rain or snow that later freezes, the fabric itself becomes a sheet of ice against the foliage, causing the damage you were trying to prevent. Apply only in dry weather when a clear cold night is forecast.

Tight wrapping on cedars and evergreens. Strapping burlap tight against cedar or arborvitae shades the interior needles, stops photosynthesis, and can cause winterkill—the tree turns brown from the inside out by spring. Use stakes to keep the fabric off the foliage.

Additional Practical Uses for Burlap in Cold Weather

While the focus is frost, burlap serves several related protective roles that make it worth keeping on hand.

• Critter barrier: Drape short lengths around tender young trees and attach to stakes; deer and rabbits won’t push through the loose weave as readily as they do through plastic.
• Seed bed cover: A single layer over freshly sown beds stops birds from scratching up seeds and prevents heavy rain from washing soil away, while the loose weave still lets seedlings push through.
• Potted plant insulation: Wrap containers in two or three layers of burlap to protect roots from freezing; potted plants are far more vulnerable than in-ground ones because the root zone is exposed on all sides.

Burlap Protection Checklist for Your Yard

Here’s the at-a-glance decision tool for whether and how to use burlap this winter.