Nampa, ID Frost Dates
The last spring frost in Nampa usually comes around April 29 and the first fall frost around October 13.
| Spring (last) | Fall (first) | |
|---|---|---|
| Frost, 32°F | April 29 | October 13 |
| Hard freeze, 28°F | April 11 | October 25 |
Growing season: about 164 days.
Frequently asked questions
When is the last frost in Nampa, ID?
The median date of the last spring frost (32°F) is April 29. In half of years the last frost comes earlier and in half it comes later, so waiting a week or two past April 29 lowers the risk for tender plants.
When is the first frost in Nampa?
The median date of the first fall frost (32°F) is October 13, and a hard freeze (28°F) usually follows around October 25.
How long is the growing season in Nampa?
About 164 days between the median last spring frost and first fall frost.
NOAA NCEI U.S. Climate Normals 1991-2020, station USC00106305. Median (50% probability) dates. Low spots and valleys can frost later in spring and earlier in fall than the station.