Frost dates in Smithfield, UT
The average last spring frost in Smithfield is around May 18 and the first fall frost is around September 25. That gives Smithfield an average growing season of about 130 days.
Last spring frost
| Early (10% chance after) | May 3 |
|---|---|
| Average (50%) | May 18 |
| Late (90%) | June 10 |
First fall frost
| Early (10%) | September 11 |
|---|---|
| Average (50%) | September 25 |
| Late (90% chance before) | October 13 |