Freeze/Frost Probability & Growing Season Length
Freeze/frost probability maps – based on 1981-2010 normals
Spring
temperature as cold or colder than
36°F
Average last day of 36°F or lower
1 in 10 years have a last 36°F temp. before this date
1 in 10 years have a last 36°F temp. after this date
32°F
Average last day of 32°F or lower
1 in 10 years have a last 32°F temp. before this date
1 in 10 years have a last 32°F temp. after this date
28°F
Average last day of 28°F or lower
1 in 10 years have a last 28°F temp. before this date
1 in 10 years have a last 28°F temp. after this date
Autumn
temperature as cold or colder than
36°F
Average first day of 36°F or lower
1 in 10 years have a first 36°F temp. before this date
1 in 10 years have a first 36°F temp. after this date
32°F
Average first day of 32°F or lower
1 in 10 years have a first 32°F temp. before this date
1 in 10 years have a first 32°F temp. after this date
28°F
Average first day of 28°F or lower
1 in 10 years have a first 28°F temp. before this date
1 in 10 years have a first 28°F temp. after this date
Growing Season Length
temperature persistently above or equal to
36°F
Average growing season length days ≥ 36°F
1 in 10 years have a first 36°F temp. before this date
1 in 10 years have a first 36°F temp. after this date
32°F
Average growing season length days ≥ 32°F
10% of days ≥ 32°F longer than
90% of days ≥ 32°F longer than
28°F
Average growing season length days ≥ 28°F
10% of days ≥ 28°F longer than
90% of days ≥ 28°F longer than
