Frost dates in Keene, NH
The average last spring frost in Keene is around May 18 and the first fall frost is around September 23. That gives Keene an average growing season of about 128 days.
Last spring frost
| Early (10% chance after) | May 4 |
|---|---|
| Average (50%) | May 18 |
| Late (90%) | June 4 |
First fall frost
| Early (10%) | September 11 |
|---|---|
| Average (50%) | September 23 |
| Late (90% chance before) | October 8 |