Last frost date in Boise City, Idaho
April 24
Average last frost in spring. In an early year (1 in 10) it's over by April 4; in a late year (1 in 10) it comes after May 9.
October 21
Average first frost in fall. 1 year in 10 it comes by October 5.
Source: NOAA U.S. Climate Normals 1991–2020, station Boise Air Terminal (USW00024131), 2.3 miles from Boise City, elevation 2,814 ft. NOAA National Centers for Environmental Information. These are long-term averages, not a forecast.
This station is also the nearest one for Kuna and Meridian, so their frost dates are the same as Boise City's.
| Early year | Average | Late year | |
|---|---|---|---|
| Last frost in spring | Apr 4 | Apr 24 | May 9 |
| First frost in fall | Oct 5 | Oct 21 | Nov 5 |
Frost-free days in an average year: 179
| Chance in a year | Average last in spring | Average first in fall | |
|---|---|---|---|
| Light frost (36°F) | Every year | May 8 | Oct 8 |
| Frost (32°F) | Every year | Apr 24 | Oct 21 |
| Hard freeze (28°F) | Every year | Apr 2 | Oct 31 |
Nights at 32°F or colder in an average year: 108
What to plant now in Boise City
- Spring planting calendar for an average last frost around April 20 Boise City: April 24
- Fall planting calendar for an average first frost around October 20 Boise City: October 21
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 Idaho
- Garden City 6 mi · last frost May 17
- Eagle 15 mi · last frost Apr 30
- Nampa 17 mi · last frost Apr 29
- Mountain Home 42 mi · last frost May 2
- Jerome 106 mi · last frost May 2
Updated