Frost dates in Union Gap, WA
The average last spring frost in Union Gap is around May 12 and the first fall frost is around October 3. That gives Union Gap an average growing season of about 144 days.
Last spring frost
| Early (10% chance after) | April 23 |
|---|---|
| Average (50%) | May 12 |
| Late (90%) | May 28 |
First fall frost
| Early (10%) | September 22 |
|---|---|
| Average (50%) | October 3 |
| Late (90% chance before) | October 19 |