![]() Plant these seeds or transplants two to three weeks before the date of the average last spring frost they will grow in daytime temperatures as low as 40 degrees Fahrenheit. Hardy vegetables tolerate cold temperatures the best-their seeds will germinate in cool soil, and seedlings can typically survive heavy frost. Know the Temp for Seedlings Although the seeds of some plant species require a temperature as low as 50 degrees Fahrenheit to germinate, the optimal temperature for seedlings is between 65 and 75 degrees Fahrenheit, The Old Farmer’s Almanac says. The carrot tops are cold-hardy down to at least 18☏ but the roots can take even colder temps, especially if you pile on a thick layer of straw mulch to insulate them. Other plants are just hardy by nature and can withstand temperatures as low as 18-20☏. Some keel over when temps fall to 40☏ others crumble at 35☏. Tropical plants have differing low-temperature thresholds. Seedlings, with their tender new leaves, often give up the ghost when temperatures dip to 32-33☏. What is the lowest temperature seedlings can tolerate? Should I cover my plants at 39 degrees?.How cold is too cold for vegetable seeds?.How do you protect carrot seedlings from frost?.Should I cover my plants at 43 degrees?.How cold is too cold for seedlings in greenhouse?.Is 40 degrees at night too cold for plants?.What happens when seedlings get too cold?. ![]() At what temperature do carrots stop growing?.What temperature is safe for seedlings?.What is the lowest temperature seedlings can tolerate?.
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