Protecting Plants from Early Frost

Simple ways to ride out an early light frost: covers, pots, and watering. Hard freezes still end tender crops.

Published 2026-09-02 by ThriveThyme

frost protection fall planting first frost

An early light frost does not have to end the garden overnight. A hard freeze is different. Know which you are facing.

Before a Forecast Freeze Night

Water the soil earlier in the day if it is dry. Moist soil holds heat better than bone-dry soil.
Cover tender crops with fabric row cover, an old sheet, or a frost blanket before dusk. Anchor the edges. Remove covers in the morning so plants do not cook.
Move pots against a wall or indoors for the night.
Harvest ripe tender fruit (tomatoes, peppers, beans) if a hard freeze is likely. See what to harvest before the first frost and how to ripen green tomatoes indoors.

Lightweight fabric helps for a short light frost on greens and fruiting plants.
Plastic that touches leaves can damage them. Keep plastic off foliage or use hoops.
Covers buy days or a week in a mild snap. They do not turn a zone 4 yard into zone 7 for the season.

Damaged tomato and basil tops often will not recover after a hard freeze. Pull and compost.
Kale, collards, and many root crops often taste better after light cold. Keep harvesting. More: vegetables that taste better after frost.
Empty beds can take a cover crop if soil is still workable and you have establish time left.

Set first frost in My Garden, then use What to plant before first frost and What is first frost. For zone lists, start at What to plant now. For a frost countdown and a pick-now crop list, open the Frost Harvest Desk.