Frost dates in Glenns Ferry, ID
The average last spring frost in Glenns Ferry is around May 14 and the first fall frost is around September 25. That gives Glenns Ferry an average growing season of about 134 days.
Last spring frost
| Early (10% chance after) | April 19 |
|---|---|
| Average (50%) | May 14 |
| Late (90%) | June 3 |
First fall frost
| Early (10%) | September 10 |
|---|---|
| Average (50%) | September 25 |
| Late (90% chance before) | October 13 |