Frost dates in Sidney, MT
The average last spring frost in Sidney is around May 16 and the first fall frost is around September 21. That gives Sidney an average growing season of about 128 days.
Last spring frost
| Early (10% chance after) | April 30 |
|---|---|
| Average (50%) | May 16 |
| Late (90%) | May 29 |
First fall frost
| Early (10%) | September 10 |
|---|---|
| Average (50%) | September 21 |
| Late (90% chance before) | October 11 |