Last frost date in Smithfield, Utah
May 8
Average last frost in spring. In an early year (1 in 10) it's over by April 24; in a late year (1 in 10) it comes after May 29.
October 2
Average first frost in fall. 1 year in 10 it comes by September 19.
Source: NOAA U.S. Climate Normals 1991–2020, station Logan Cache AP (USW00094128), 3.6 miles from Smithfield, elevation 4,454 ft. NOAA National Centers for Environmental Information. These are long-term averages, not a forecast.
| Early year | Average | Late year | |
|---|---|---|---|
| Last frost in spring | Apr 24 | May 8 | May 29 |
| First frost in fall | Sept 19 | Oct 2 | Oct 15 |
Frost-free days in an average year: 144
| Chance in a year | Average last in spring | Average first in fall | |
|---|---|---|---|
| Light frost (36°F) | Every year | May 30 | Sept 20 |
| Frost (32°F) | Every year | May 8 | Oct 2 |
| Hard freeze (28°F) | Every year | Apr 22 | Oct 13 |
Nights at 32°F or colder in an average year: 173
What to plant now in Smithfield
- Spring planting calendar for an average last frost around May 10 Smithfield: May 8
- Fall planting calendar for an average first frost around September 30 Smithfield: October 2
Planting dates: USDA Home and Garden Bulletin No. 9 (1967), “Suburban and Farm Vegetable Gardens,” tables 4 and 5. How we match the table.
Nearby in Utah
- North Logan 4 mi · last frost Apr 30
- Logan 7 mi · last frost May 8
- Hyrum 14 mi · last frost May 12
- Tremonton 20 mi · last frost Apr 24
- Brigham City 26 mi · last frost May 5
Updated