just one question in regards to the growing season (temperatures, frost, freeze)

[Isleofpalms85]

At what temperature do meteorologists define as the end of the growing season, is it when the low bottoms out at 32 Degrees Fahrenheit or is it 28 Degrees Fahrenheit?

[B87]

Isn't it when the mean temperature is above 5 or. 6c, the temperature above which grass wil grow?

[Isleofpalms85]

Originally Posted by B87

Isn't it when the mean temperature is above 5 or. 6c, the temperature above which grass wil grow?

Really, a mean temperature of less than 40 degrees Fahrenheit? who would've ever thought that until you I always thought that terms killing frost or hard freeze had superficial meaning, I guess they must notI

[Ariete]

The US definition is the time between the first and last 32F air temperatures. I find it a bit odd, as here we usually get a freeze or two in May, though the growing season has definitely already started. Also, we had a freeze on October 1, but the growing season hasn't ended.

Finland uses the 5C/41F daily mean temp when the temp is permanently above that, usually from mid April to late October. Several freezes in a row though ends or postpones the growing season, though the temp may have been above the treshold before or after.