How Low of a Temperature Can Tomato Plants Withstand?

Tomatoes are a warm-season crop that thrive in temperatures between 70 to 90 degrees Fahrenheit. However, unexpected cold snaps and winter frosts can damage or even kill tomato plants. In this article, we will explore how low of a temperature tomato plants can withstand and how to protect them from the cold.

Tolerable Temperature for Tomato Plants

Tomato plants are not frost tolerant and can be damaged at temperatures below 32 degrees Fahrenheit. Exposure to freezing temperatures can cause the plant's leaves, stem, and fruit to become black and mushy. Therefore, it is recommended to plant tomatoes after the last frost date in your area or cover them with a protective layer if temperatures are expected to drop.

However, tomato plants can handle cooler temperatures above freezing. In fact, the plants grow and produce better when exposed to temperatures between 50 to 75 degrees Fahrenheit. If the temperatures approach the lower end of this range, the growth of the plants may slow down, but they can still survive.

Preparing for Cold Temperatures

If you live in an area that experiences unexpected temperature drops, it's best to plan for the worst and prepare your tomato plants for the cold. Here are some tips to protect your plants from frost:

Cover the plants with blankets, sheets, or frost cloths. These materials create a layer of insulation that helps prevent heat loss from the plants.

Place a small heater or incandescent light bulb near the plant. This creates extra warmth that helps raise the temperature around the plant.

Mulch the soil around the plants. A layer of organic mulch, such as straw or leaves, protects the soil from freezing and helps maintain warmth around the roots.

Water the plants before the cold snap. Wet soil holds more heat than dry soil, and water can also help protect the plant's roots from freezing.

Conclusion

Tomatoes are a beloved crop that can provide a bountiful harvest. However, it is important to protect them from the cold, as they are not frost-tolerant. Remember to plan for unexpected temperature drops, cover the plants with insulating materials, and provide extra warmth with heaters or light bulbs. By taking these precautions, you can help ensure a healthy and thriving tomato plant.