Growing Strawberries in a Cold Frame: Shelter and Earlier Crops

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You can grow strawberries in a cold frame, using it for shelter or to bring the harvest forward. An unheated frame does not guarantee winter fruit, and established strawberry plants do not all need one to survive outdoors.

When I first wrote about this, I had rescued a few sad-looking strawberry plants from a discount shop and was pleased they had survived winter. That small win is still worth celebrating. The useful next question is what the frame actually contributes, rather than assuming a cover can do everything.

Choose the job you want the frame to do

Your aim	What to expect
Shelter exposed container plants	Some protection from wind and rain, with continued checks on moisture and ventilation.
Encourage an earlier crop	Cover from late winter to encourage earlier growth, while managing frost and pollination.
Harvest strawberries all winter	A basic unheated frame is not a dependable way to achieve this.

If your plants are already established in a well-drained bed, read the guide to strawberry winter care before deciding you need extra equipment.

What is a cold frame?

A cold frame is a low protective structure with a transparent lid. It admits daylight and gives some shelter, but its temperature still responds to the weather. A closed frame can warm quickly in sunshine and become cold again at night.

The RHS guide to cold frames explains their uses and the importance of managing ventilation. Think of the lid as something you adjust, not something you shut in October and forget until April.

How to set up strawberries in a cold frame

1. Choose healthy plants. Check for rotting fruit, damaged leaves and obvious pest problems before moving them in.
2. Use containers with drainage. Arrange them so water can escape and you can reach each pot.
3. Allow room to inspect the plants. Avoid packing every gap so tightly that watering and checking become awkward.
4. Secure the frame and lid. Consider wind exposure, pets and children, especially if using reclaimed glazing.
5. Keep a simple checking routine. Look at moisture, condensation, growth and the forecast.

You do not need a perfect matching set of pots. A setup you can inspect easily is more useful than one that looks beautiful but makes the back row inaccessible.

Ventilation matters, even in cold weather

Open or prop the lid safely when conditions allow to release excess warmth and moisture. Close it as needed for adverse weather. Adjust to your site: a sheltered sunny frame will behave differently from one in a cold, exposed corner.

Persistent condensation is a reason to inspect airflow and moisture, rather than add more insulation automatically. The RHS guidance on protective cloches also explains why ventilation is part of using covers successfully.

How often should you water?

There is no reliable “every three days” rule. A lid excludes rain, while dormant plants use less water than actively growing ones. Check the compost and water when needed, letting excess drain away.

Do not respond to every drooping leaf by pouring in more water. First check whether the pot is dry or already wet. The same visible symptom can lead you towards very different actions.

Using a cold frame for an earlier strawberry harvest

The RHS suggests moving potted strawberries into an unheated greenhouse or cold frame in February to encourage earlier cropping. Timing still depends on weather and local conditions.

Once flowers appear, allow access for pollinating insects when weather permits and watch for frost. Covering plants can bring flowers forward into a period when protection is still needed. Earlier growth creates another job to manage; it is not a completely hands-off shortcut.

One practical experiment is to put a few plants under cover and leave comparable plants outside. Label them, record the first flower and first ripe fruit, and see whether the result justifies the space in your own garden. Treat this as a household comparison rather than a controlled scientific trial.

What happens after the cold-frame crop?

As conditions improve, increase ventilation and acclimatise plants before moving them back into an exposed position. The frame can then serve another seasonal job. Avoid turning it into permanent overcrowded storage.

If an earlier harvest would be useful, try a small number of plants first. If your main aim is simply keeping existing strawberries healthy through winter, drainage and sensible care may be enough.

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Reviewed and updated October 2026. By Niki Wilkinson, Back To The Good Life.

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