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What Temperature Should A Polytunnel Be?

Keeping the temperature in your polytunnel consistent is an important part of growing vegetables. There are several factors to consider including the type of soil you have, the amount of ventilation, and pests. Here are a few tips to help you keep your polytunnel at the perfect temperature.


Keeping your polytunnel cool is a common problem, especially in the summer months. To keep your polytunnel cool, you need to ensure it has proper ventilation. There are various ways to do this. Some of them are more expensive than others. The best way to do this is to determine the best type of ventilation for your specific needs.

In terms of ventilation, it isn’t a good idea to try and cover up your polytunnel with a large integrated foil window. While this may help to keep your plants dry, it will also contribute to more moisture under the cover.

The most obvious way to ventilate a polytunnel is by opening the doors. This aids natural ventilation, but it isn’t the most effective solution. You may want to consider installing double doors or a larger sliding door to improve ventilation. You also want to avoid blocking the airflow with obstructions.

Another way to ventilate a polytunnel is by implementing side ventilation. This can be an ideal solution in calm, sheltered locations. It is also a good choice for polytunnels with variable ventilation needs. A side ventilation system typically includes a timber fixing rail and side aluminium gutters.

Soil temperature

Keeping cool in a polytunnel is important, particularly if you are growing food crops. To do so, you need to make certain design decisions and abide by some basic rules.

Keeping cool in a polytunnel requires good airflow and ventilation. It is also important to avoid overcrowding, which can cause problems with air movement.

The ideal temperature for most polytunnel plants is between 26 and 30 degrees Celsius. This is a warm enough temperature for germination but not too hot. A lower temperature can be detrimental to plants, especially those that are thermophilic. It is important to avoid overheating, because too much heat can cause problems with photosynthesis.

A good way to avoid overheating is to add organic mulch to the beds. It also helps keep the plants cool and prevent disease.

Using a shade net can be a good way to keep cool in a polytunnel, but be sure to tie it to the roof of the polytunnel on the inside. You can also use 4-mil or 6-mil agriculture grade plastic over the row cover.


Choosing the right temperature for a polytunnel can make all the difference to the health and wellbeing of your plants. Too high a temperature can kill your plants. On the other hand, too low a temperature can stunt the growth of your plants.

A polytunnel should provide adequate ventilation to avoid overheating. In order to do this, you may want to consider a fan. Fans should be placed about six feet above the floor of the polytunnel, and not on the ceiling. A fan will draw fresh air into the polytunnel and keep hot air from escaping.

A polytunnel is a good place to grow some exotic vegetables. However, if you want to grow some hardy vegetables, you might want to think about a greenhouse. A greenhouse is a place where you can grow plants that don’t like the cold or hot temperatures of your local climate.

A polytunnel can also help you protect your plants from hailstones and heavy rain. However, the best way to do this is to keep the doors open as much as possible during the summer months. This will help the air move around your plants, thereby preventing disease and pests.

Growing vegetables in a polytunnel

Using a polytunnel to grow vegetables is a great way to prolong your growing season and protect your plants from harsh weather conditions. These types of structures can be moved around as weather changes, allowing you to maximise your production. They are also great for propagating plants.

There are many different types of vegetables that can be grown in a polytunnel. Some are able to be overwintered. These plants remain dormant until the following spring, but they will still grow.

Tomatoes are a good choice for growing in a polytunnel. These plants are low to the ground and require little space. They can be planted in single rows or you can grow them in raised beds. These plants require a warm climate to grow well.

Cucumbers are another vegetable that can be grown in a polytunnel. They can be sown in spring or early summer. These plants can be planted at 45cm (18″) spacing.

Rocket is another great choice for growing vegetables in a polytunnel. This plant is easy to grow and has a peppery flavour. Rocket grows quickly and is ready to harvest within a few weeks.