How to Set Up a Frost-Night Kit

What to keep by the door for a 32F night: row cover, pins, hoops, cloches, and a crop list. Prep once so you are not cutting fabric at dusk.

Published 2026-10-12 by ThriveThyme

frost night row cover season extension fall

How to Set Up a Frost-Night Kit

The hard part of a frost night is not the fabric. It is finding scissors, pins, and a dry cover after dark. Pack the kit once in early fall and leave it by the door.

Act when the forecast low is 32F or below (light frost) or 28F or below (hard freeze). Your forecast beats any zone table. See first frost date and the Season Extension Desk.

What Goes in the Kit

• Row cover cut to bed size, with enough extra to drape to the soil on all sides. Medium weight (about 0.5 to 1.0 oz per sq yd) covers most fall greens. Keep a light piece for one-night saves and a heavier piece if you overwinter spinach or kale.
• Pins, staples, or rocks to hold edges. Wind lifts loose fabric.
• Hoops (wire or PVC) if you use a low tunnel. Store them nested so they are ready to stick in.
• Cloches or milk jugs with bottoms cut out for a few individual plants.
• Gloves and a headlamp for after-dusk covers.
• A one-page crop list: pick / cover / leave in. Print it from Frost Harvest Desk or Season Extension Desk, or write the beds on a card.

Optional: a spare old sheet for a one-time emergency cover. Fabric row cover breathes better and is the better repeat tool.

Prep Steps (Do These Before Frost Season)

1. Measure each bed you plan to cover. Cut fabric now. Label pieces with a permanent marker (north bed, cold frame, tomatoes).
2. Stick hoops in once on a calm afternoon so holes are ready. Pull them if you need to till; otherwise leave them.
3. Sort pots and tender crops you can move against a wall or indoors for the night.
4. Water dry beds in the afternoon before a frost night. Moist soil holds more heat than bone-dry soil. Do not soak leaves at dusk.

On the Night

1. Pick tender crops before dusk. Covers do not reliably save tomatoes and peppers through a hard freeze. Use Frost Harvest Desk.
2. Cover light-frost greens before dusk. Anchor every edge.
3. Close cold frame lids. Prop them again by mid morning. See How to vent a cold frame on sunny days.
4. Open tunnels and strip flat covers once the sun is up and air is above freezing so plants do not cook.

How Much Fabric to Buy

A bed 4 feet by 8 feet needs about 5 by 10 feet of fabric so edges reach the soil. Buy a little extra for tears. Medium fabric for greens is the first roll most gardeners need. Add heavy fabric only if you plan to overwinter.

Degree gains and method limits: Cold frame vs row cover vs low tunnel and How to use row cover and low tunnels.

Next Steps

• Mark which crops to cover on a frost night.
• Keep the kit dry. Wet fabric is heavy and miserable at dusk.