Frost dates in Sinclair, WY
The average last spring frost in Sinclair is around May 31 and the first fall frost is around September 17. That gives Sinclair an average growing season of about 109 days.
Last spring frost
| Early (10% chance after) | May 13 |
|---|---|
| Average (50%) | May 31 |
| Late (90%) | June 17 |
First fall frost
| Early (10%) | September 3 |
|---|---|
| Average (50%) | September 17 |
| Late (90% chance before) | September 26 |