Winter Garden Protection

What am I actually protecting the garden from?

Plants face several winter threats: sustained cold, sudden temperature swings, drying wind, ice, heavy snow and heaving as soil freezes and thaws. The swings are often more harmful than steady cold.

Know what you grow. Hardy perennials and trees may need little, while borderline plants and tender crops need real protection. The USDA hardiness zone map shows winter minimum temperatures to help judge which plants suit your site.

Look at your site as well as the plants. Low spots collect cold air, south-facing walls hold heat and open areas take the full wind. Moving a tender plant a few feet can change its odds.

• Check low spots where cold air settles
• Note wind direction and exposed areas

How does mulch protect plants?

A layer of organic mulch insulates soil, evens out temperature swings and reduces heaving. Apply it after the ground cools so it does not shelter rodents early or keep soil too warm.

Use clean, weed-free material such as straw or shredded leaves, and keep mulch slightly back from stems and trunks to avoid rot and rodent damage. Remove or thin it gradually in spring.

Leaves that mat down can smother crowns, so mix them with coarser material or shred them first. Check mulch after a thaw to see that it has not shifted.

• Wait until soil has cooled
• Use clean, weed-free mulch
• Keep it away from trunks
• Remove gradually in spring

When do row covers and cold frames help?

Row covers and cold frames add a few degrees of protection and block wind. They extend harvests of hardy crops such as many greens and can shelter young plants. Extension offices such as Utah State and Colorado State publish guidance on season extension.

Anchor covers firmly against wind and vent cold frames on sunny days so plants do not overheat. Check them regularly for moisture, pests and damage.

• Anchor covers against wind
• Vent frames on sunny days
• Check for moisture and pests
• Remove covers during warm spells as needed

How do I protect trees, shrubs and perennials?

Young trees can suffer from sunscald, animal browsing and rodent damage. Trunk guards, fencing and proper watering before freeze-up help. Ask your extension office for guidance on your species.

Wrap or cover tender plants only if your extension office recommends it, and avoid plastic that traps moisture and heat. Water well in fall if conditions are dry, since dry roots are more vulnerable in winter.

Rodents tunnel under mulch and snow and chew bark on young trees, so install guards before the first snow and check them after storms.

• Install guards before the first heavy snow
• Water well before the ground freezes if fall is dry

What about containers and raised beds?

Containers are more exposed than ground soil and their roots freeze more easily. Move tender plants indoors or into a sheltered spot, group pots together and insulate them as advised for your species.

Raised beds drain well but cool quickly. Mulch them and consider covers for hardy crops. Empty clay pots where water could freeze and crack them.

Check pots after hard freezes for cracks and loose soil, and bring in any that hold plants you want to keep.

How do I manage snow, ice and wind?

Snow can insulate plants, but heavy or wet snow can break branches and crush frames. Brush snow gently from shrubs and structures when it is safe, and do not shake ice off branches, which can cause breakage.

Windbreaks such as fences or evergreens reduce drying and damage. Think about where winds come from on your property and place shelters accordingly. Support or remove any structures at risk of collapse.

Do not walk on frozen or snow-covered lawn beds and perennial plantings more than needed, since compaction and crushed crowns do damage.

• Brush wet snow off shrubs gently
• Never beat or shake ice off branches
• Check cold frames after storms

What winter tasks can I do on mild days?

Winter is a good time to plan next year's garden, order seed, test soil if ground is workable and clean and repair tools and structures. Check stored bulbs, tubers and produce for rot or sprouting.

Walk the garden after storms, noting damage and checking covers. Keep a journal with weather, protection methods used and results, so you learn what works on your site.

Winter is also a good time to review your soil test results and plan amendments, using your extension office's advice and the product label.

Last reviewed: November 12, 2026. Written by the Homestead & Small Farm Editorial Team. See our editorial policy.