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what temperature should a greenhouse be at night

What Temperature Should a Greenhouse Be at Night?

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Diving into the world of greenhouses is like stepping into a realm of endless possibilities. One burning question that often pops up, especially among newcomers, is “What temperature should a greenhouse be at night?” Well, you’re in luck! While the ideal nighttime temperature varies, for most plants, it’s between 60°F to 68°F.

But that’s just the tip of the iceberg. As you delve deeper into this article, you’ll uncover the nuances of greenhouse temperatures, ensuring your plants thrive in their cozy abode.

What Temperature Should a Greenhouse Be at Night?

From our experience, the ideal temperature for a greenhouse at night varies depending on the plants you’re growing. However, for most plants, maintaining a temperature between 60°F to 76°F is a good rule of thumb. The temperature should never drop below 45°F. But remember, it’s essential to consider the specific needs of your plants. For instance:

  • Cold-season crops like lettuce or greens thrive at around 45 to 50°F.
  • Tomatoes or cucumbers prefer a warmer environment, ideally between 65°F to 70°F.
  • If you’re growing citrus trees and aiming for fruit production, aim for 70°F to 75°F.

How to Maintain Greenhouse Temperature at Night

Understand your greenhouse’s microclimate

Every greenhouse has its unique microclimate, and in our experience, this is influenced by more than just the obvious factors like nearby trees, houses, and fences.

how cold can a greenhouse get

The direction your greenhouse faces, the type of soil beneath it, and even the altitude can play a role. Being aware of these factors is crucial when adjusting temperatures, as they can significantly impact internal warmth and humidity.

Invest in good heating systems

Does a greenhouse need a heater? Contrary to popular belief, greenhouses do need heating, especially in the colder months. Natural gas, propane, and electricity are the top fuel choices.

After putting it to the test, we found that having two heaters is not just a luxury but a necessity. This dual system acts as a safety measure, ensuring that your plants remain protected even if one heater fails.

We also highly recommend learning the best way to heat a greenhouse. Proper greenhouse heating is crucial to keep your plants thriving.

Ventilation is key

Proper ventilation is the unsung hero of a thriving greenhouse. Automatic shutter ventilation systems have been game-changers in our experience. They work tirelessly to regulate airflow, ensuring a consistent environment.

Additionally, fans are essential, not just for temperature, but also for maintaining the right humidity levels, which can be just as crucial for plant health.

Adjust for seasons

Remember, the needs of your greenhouse change with the seasons.

During the hot summer months, shade cloths are essential to protect plants from intense sunlight.

Ensure proper ventilation by opening vents and windows, and consider using fans to circulate air and reduce humidity. Water plants during cooler parts of the day to prevent rapid evaporation. It’s also a good idea to learn how to cool a greenhouse without electricity for summer.

how much warmer does a greenhouse get

In winter, insulation is key. Use materials like bubble wrap to retain heat. Ensure your heating system is functional, and always have a backup. Water plants sparingly, as they require less moisture in cooler temperatures, and regularly check for and seal any gaps to keep the cold out. If you’re looking to save on costs, be sure you know the cheapest way to heat a greenhouse.


When winter’s chill sets in, insulation becomes your greenhouse’s best friend. According to our research, materials like bubble wrap or polycarbonate sheets can be used to trap heat, ensuring that the temperature remains steady. This not only protects your plants but can also save you a significant amount on heating costs.

Regular maintenance

Last but certainly not least, regular maintenance goes a long way. From our experience, routinely checking for gaps, cracks, or any wear and tear and addressing them promptly can make a world of difference. This not only helps in maintaining the temperature but also extends the life of your greenhouse.

minimum greenhouse temperature

Ready to turn your greenhouse into a plant paradise? Visit Greenhouse Emporium for top-tier greenhouse accessories, and let’s make your green dreams a reality today!

Picture of Jesse James
Jesse James

Jesse James, an Army Veteran, now shares his passion for gardening through engaging articles on Greenhouse Emporium. Leveraging his experience and love for nature, Jesse provides practical advice and inspires others on their gardening journey.

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