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How Warm Is A Polytunnel In Winter?

How Warm Is A Polytunnel In Winter

Temperature control

To avoid the risk of plants suffering from too much cold in winter, you need to carefully control the temperature inside the polytunnel. The polytunnel plastic layer contains air bubbles that help trap heat and limit the loss of warm air. The larger the bubbles, the more light they collect and the more efficient the heating process is. Make sure to remove the snow from the tunnel to reduce the heat loss.

The most important factor when ensuring good temperature control in a polytunneil in winter is the type of polythene used. It’s advisable to choose a polytunnel with double-layered polythene and reinforced nylon mesh. The reinforced polythene will be more insulated and durable. However, these structures tend to be more expensive than their non-reinforced counterparts. Also, they don’t let in as much light as a regular polytunnel.


Ventilation is important in a polytunnel, and should not be neglected if you haven’t already done so. Good air circulation is vital to the well-being of your crops, and it can also reduce disease. There are a number of different methods for achieving good ventilation in a polytunnel.

Firstly, you need to decide what type of ventilation is necessary for your particular polytunnel. For example, doors may be sufficient for some plants, but if your polytunnel is larger and is used for different purposes, you may need to install additional side ventilation.


If you are planning to plant some crops indoors in winter but don’t have the right climate, you can consider purchasing a polytunnel. This structure allows about eighty percent of the sunlight to reach your plants. It is also more protected from the elements, such as snow and rain. Polytunnels are typically cheaper than greenhouses, but the cost of replacement plastic can add up.

A polytunnel should be insulated to keep your crops alive in winter. This type of structure is usually made from a double layer of polythene reinforced with nylon mesh. This reinforced polythene material is far more durable and insulating. However, it is not as transparent as a conventional greenhouse, and it will cost you more.

Plant protection

Winter is a tricky time for plants and polytunnels. Frost and snow can cause damage to crops, especially those grown in the polytunnel. You can protect plants by using horticultural fleece, bubble wrap, or row covers. You can also cover individual plants with cloches made from plastic packaging.

Adding thermal mass to your polytunnel or greenhouse can help protect your plants during the winter months. This mass helps absorb the heat of the sun during the day and then release it slowly when temperatures fall. This can help protect tender plants from frost. You can also plant tender plants near a sunny south-facing wall to prevent them from being damaged by frost.


When growing crops in winter, a polytunnel can be an invaluable tool. The proper insulation of a polytunnel can ensure that crops grow and produce well even in the dead of winter. They are made from double layers of polythene reinforced with nylon mesh to keep the cold out and prevent the plants from freezing. These double layers increase insulation and are more expensive than regular polytunnels. These structures also don’t allow for a great deal of light.

One of the benefits of a polytunnel is that you can grow many different types of plants. It allows you to grow plants that would be impossible to grow outside. Most of these plants are annuals. However, you can plant some perennial plants as well. For example, asparagus and globe artichokes do very well in a polytunnel. This means that you can eat more of them.


The size of a polytunnel is an important factor to consider, especially if you plan to grow crops inside it. A large polytunnel is more versatile than a small one, and will allow you to get the most out of your produce. However, if you intend to grow crops outdoors, a smaller polytunnel may not be the most practical option.

The soil in your polytunnel needs some extra care in the winter. It will become more fertile and will be able to support growing plants better in the spring and summer. It can be enhanced by adding manure, compost, or mulch during mid-winter.


Winter conditions can have a significant impact on a polytunnel. The materials used can help to retain heat and prevent damage to the structures. For example, adding a layer of horticultural fleece or bubble wrap to the beds can protect plants from frost. It is also possible to use cloches made from plastic packaging to protect individual plants.

Another great advantage of a polytunnel is that it extends the growing season. This means you can continue to grow your vegetables even when the weather is sub-optimal. Many plants grow faster in a polytunnel and mature sooner, so you can enjoy the benefits of earlier harvests. Often, crops that aren’t hardy can overwinter indoors in a polytunnel.