growing weed in cold temperatures

Growing weed in cold temperatures

Let’s say you found a nice spot somewhere in a forest or in some other lovely outdoor location. If you can, don’t plant your outdoor crops directly in soil, but use pots instead. This way, you can easily move your plants should it turn out that the “sunny spot” you found in spring doesn’t look so great later on in the year. With your plants in pots, you will also have the option of bringing them safely indoors when frost or heavy rain is predicted.

One difference to HID is that LED lights create significantly less heat. In general, this is seen as an advantage. During the warmer months of the year, LEDs won’t heat up your tent as much as HID, so you won’t need additional cooling for your grow room. Likewise, LEDs allow you to output lots of light and therefore maximise your harvest without risking heat stress or burning your plants.

Some think that growing weed with good yields in Northern climates is only possible during the short months of summer. But this isn’t true. You can also grow cannabis in cold weather if you know how to go about it. Read on to learn how you can grow marijuana in cold weather!

On the other hand, LED lights can be a clear disadvantage in winter. Since they produce almost no heat, they can’t warm up your growing area as HID lamps do. This means you’ll likely require an extra heater so that your plants can thrive when it’s colder.

Use Pots5. USE POTS

Contrary to what some might say, it is possible to grow weed with good results outdoors in cooler climates. You can in fact grow outdoor marijuana all year round if you plan your grow well. For example, it can help to know the weather particular to your area so you can time your harvest to beat mould and frost. Here are our tips on how you can grow marijuana in cold weather.

Those places around the world where cannabis grows out in the wild have plenty of sunshine, fertile soil, and an optimal outdoor temperature of 20–28°C. In Northern Europe, including the UK, the Netherlands, Germany, and many other parts of Europe, we can feel lucky if we get such optimal outdoor growing conditions for a few short weeks in summer. Then again, this doesn’t have to be a problem if we grow indoors.

The same is true for CFL (fluorescent) grow lights that are still widely used for vegging. Just like LEDs, these lamps hardly create any heat, so you will possibly need some heating solution to keep your plants happy and healthy.


The colder weather in fall and winter isn’t just a concern if you grow cannabis outdoors. Low temperatures can also affect your grow indoors. Your plants may avoid the threat of frost if they are away from the elements inside your home, but the lower temperatures combined with high humidity can still cause problems. For example, this can greatly increase the risk for mould and bud rot. However, whether your plants can get over the colder months will depend on several key factors. One of them is what type of grow lights you use.

Modern LEDs are now almost, if not equally as powerful as HID lamps, yet they use only a fraction of the power of HID lights. This can add up to significant savings on the grower’s energy bill over time.

Growing weed in cold temperatures

​​​​Auto-flowering strains let you keep your grow lights on for 24 hours/day, which helps keep plants warm in cool grow areas

The ruderalis hemp plant (the ancestor of all auto-flowering strains) evolved in the freezing environment of northern Siberia

I bring out my HPS grow light when the temperature drops. It puts off a lot of heat to keep plants warm. On top of that, the high levels of infrared light make plants more resistant to cold.

Hot grow lights help keep plants warm. If it’s getting cold at night, change your timer so grow lights turn on in the evening during the coldest hours.

Plants are droopy and sad when their roots get chilly. Keep the plant container off the ground when growing in a cellar or other space that has a cold floor.

But you can capture that power indoors, too. If you’re growing in a basement or garage, it’s common for the floor to be cold. When that’s the case, put your plants on a tray or some other barrier to prevent roots from sitting directly on the chilly floor.

Keep roots warm and up off the cold floor

But did you know there’s a type of cannabis that will make buds even if you leave your grow lights on for 24 hours a day?

Growing weed in cold temperatures

The most common period for growing marijuana is usually between the months of April-May (seeds germination), for the September-October harvest (this can vary depending on what planet hemisphere we live; the latitude and the season), since they are the months in which the weather is less hostile, and in the rest of the months, many are the self-growers who devote them, simply, to consume everything they harvested.

How cold affects marijuana

-If we start from seeds: It is recommended to germinate them inside your home in any winter month. The germination is carried out with natural water, between 18-22ºC.

Tips to combat the cold weather

Protect from cold to our marijuana plant