Frost dates in Monticello, UT
The average last spring frost in Monticello is around May 20 and the first fall frost is around October 8. That gives Monticello an average growing season of about 141 days.
Last spring frost
| Early (10% chance after) | May 1 |
|---|---|
| Average (50%) | May 20 |
| Late (90%) | May 29 |
First fall frost
| Early (10%) | September 26 |
|---|---|
| Average (50%) | October 8 |
| Late (90% chance before) | October 25 |