Readers ask: What Low Temperature Can Tomato Plants Tolerate?

Low Temperatures Although tomato plants can survive temperatures down to 33 degrees Fahrenheit, they show problems when temperatures drop below 50 degrees F, according to the U.S. Department of Agriculture Research Service.

What temperature is too low for tomato plants?

Temperatures below 55 degrees Fahrenheit are too low to grow a healthy tomato plant, says The University of Arizona Cooperative Extension. The low temperatures interfere with normal pollination of the blossoms, which drop off the plants. Fruit fails to set, so no tomatoes are produced.

At what temperature should I cover my tomato plants?

Temperatures between 38ºF and 55ºF won’t kill tomato plants, but keeping them covered for an extended amount of time can. Remove coverings in the morning or once temperatures rise over 50ºF to give them extra light and warmth.

Is 40 degrees too cold for tomatoes?

Although mature plants might survive light frosts, temperatures below 40 F damage flower and fruit production, making tomatoes perennial only in U.S. Department of Agriculture zones 12 and up. Tomatoes flower and set fruit best when the air and soil temperatures range between 60 and 70 F.

What temperature is too cold for tomatoes on the vine?

Between 32 and 55 degrees, tomatoes suffer from chilling injury. Growth may be stunted, leaves wilted or pitted and plants may be more susceptible to disease. Fruit will not set below 50 degrees and fruit that sets below 55 degrees may be misshapen. Fruit may also develop soft spots and have a shorter storage life.

What happens if you plant tomatoes too early?

Planting too early in cooler temperatures can cause stunted growth, wilting, surface pitting, foliage necrosis and increased susceptibility to disease. Low soil temperatures can stunt plant growth and prevent root development.

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Is 42 degrees too cold for tomato plants?

Yes, 40°F at night is cold for tomatoes, and may damage the crop. Tomatoes grow best when daytime temperatures are between 70°F and 85°F, and nighttime temperatures are between 59°F and 68°F. Low nighttime temperatures (below 55 degrees) can inhibit pollen formation and fruit development.

How do you keep tomato plants warm at night?

If your summer plants are already in the ground, cover them with individual cardboard boxes on really cold nights. If you’re going to use spun-polyester row covers, such as Reemay, or sheer curtains to keep them warm, make sure to rig up supports so the covers don’t sit directly on the plants.

What is the lowest temperature tomato plants can tolerate UK?

Tomatoes can tolerate a night time temperature falling to 13.5ºC but if the daytime temperature falls below 15ºC for a week or more, growth will be stunted at best and crops reduced. If night time temperatures drop below 13.5ºC, pollen fails to develop and flowers that open the following morning will not set fruit.

How do I protect my tomato plants from frost in the spring?

You need two things to protect your tomato and pepper plants from frost: tomato cages (wood or metal is fine) or sturdy garden stakes, and bubble wrap. The tomato cages or garden stakes will form your structure, and you’ll wrap the bubble wrap around that to protect your plants.

Should I cover my plants at 39 degrees?

Most gardeners keep fabrics and covers on hand to protect plants from cold. When the weather begins to dip, it can affect the plants and shrubs. Plants at 39 degrees can begin to feel the chill and require a cover just to be safe.

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Are tomatoes OK at 45 degrees?

A temperature of 45 degrees Fahrenheit (7.2 degrees Celsius) may not cause severe, immediate damage to your tomato plants, especially if you protect them. However, it can cause them to produce less pollen during the flowering stage.

How cold can tomatoes get at night?

They need full sun, rich soil and warm temperatures. The ideal nighttime temperatures range between 59 to 68 degrees Fahrenheit with daytime temperatures between 70 and 85 degrees F. When temperatures fall above or below these ranges, problems with growth, flowering and fruit production occur.

Will tomato plants survive a frost?

Surprisingly, tomatoes can survive a light freeze if it is not accompanied by frost, provided temperatures don’t dip below 28-30ºF. A frost, on the other hand, is localized. Low temperatures may or may not reach freezing, but moisture must be in the picture for frost to develop. Tomato plants cannot survive frost.

When can you put tomato plants outside?

Planting tomatoes outside Move your tomatoes outside after the last frost in May. Choose a sunny, sheltered spot, where you can plant them into a border (into soil that has had plenty of well-rotted garden compost added), or into 30cm pots, or put two or three plants in a growing bag.

When should I bring my tomatoes inside?

Tomato Plant Care Tomato plants can be placed outside once all risk of frost has passed, but they will do better if kept in a greenhouse or indoors overnight until the summer when daytime temperatures are no lower than 17C.