How Cold is Too Cold to Cover Tomato Plants?

Tomato plants are prone to damage from frost and cold temperatures, but they can be protected with the use of covers. However, it's important to know at what point it's necessary to cover them, and when covering them could be more harmful than helpful. In this article, we'll explore how cold is too cold to cover tomato plants.

Understanding Frost and Freezing Temperatures

Frost occurs when temperatures drop below 32°F (0°C) and water on the surfaces of plants freezes. This can cause damage to leaves, stems, and fruit. Freezing temperatures, on the other hand, occur when temperatures drop below 28°F (-2°C), and can cause even more severe damage to plants.

When to Cover Tomato Plants

It's generally recommended to cover tomato plants when temperatures are expected to drop below 32°F (0°C) for an extended period of time, such as several hours overnight. This can be achieved with the use of blankets, tarps, or other coverings. The coverings should be placed over the plants in the evening and removed in the morning, to allow the plants to receive sunlight and prevent overheating during the day.

When Not to Cover Tomato Plants

While covering tomato plants can be beneficial in protecting them from frost, it's important to know when covering them could be more harmful than helpful. If temperatures are expected to drop below 28°F (-2°C), covering the plants may actually trap cold air around them and cause even more damage. In this case, it's best to leave the plants uncovered and hope for the best.

Other Ways to Protect Tomato Plants

In addition to covering tomato plants, there are other ways to protect them from cold temperatures. One option is to plant them in raised beds or containers, which can help retain heat during colder weather. Adding a layer of mulch around the plants can also help insulate the soil and retain heat. Fertilizing the plants regularly can also help them withstand cold temperatures.

Conclusion

Tomato plants are susceptible to damage from frost and cold temperatures, but they can be protected with the use of covers. It's important to know when to cover them, and when covering them could be more harmful than helpful. Remember to remove coverings in the morning to prevent overheating, and to leave the plants uncovered if temperatures are expected to drop below 28°F (-2°C). With proper protection, your tomato plants can survive even the coldest temperatures.