Will Heat kill tomato plants?
Keeping this in consideration, what temperature kills tomatoes?
Temperatures below 32 degrees Fahrenheit will readily kill tomato seedlings. Daytime temperatures below 55 degrees will stunt growing tomatoes and decease tomato yield. If daytime temperatures drop below 50 degrees, tomato plants will survive but not yield tomatoes.
Beside above, how hot is too hot for tomato plants?
Daytime temperatures consistently above 90° F or night time temperatures consistently above 75° F create all kinds of stress for tomato plants. It's too hot for tomatoes to be pollinated. That means fewer fruit. But even more worrisome is the toll the heat takes on the plants.
Apply 3 to 4 inches of shredded bark or chopped leaves around the base of your tomato or other plant and extend it 1 to 2 inches beyond the canopy to cover the entire root zone. Mulch helps keep the soil cool, which helps maintain moisture and prevent the roots from dying in the extreme heat.