Frost dates in New Plymouth, ID
The average last spring frost in New Plymouth is around May 5 and the first fall frost is around September 29. That gives New Plymouth an average growing season of about 147 days.
Last spring frost
| Early (10% chance after) | April 16 |
|---|---|
| Average (50%) | May 5 |
| Late (90%) | May 25 |
First fall frost
| Early (10%) | September 16 |
|---|---|
| Average (50%) | September 29 |
| Late (90% chance before) | October 14 |