Bozeman, MT Frost Dates
The last spring frost in Bozeman usually comes around May 26 and the first fall frost around September 22.
| Spring (last) | Fall (first) | |
|---|---|---|
| Frost, 32°F | May 26 | September 22 |
| Hard freeze, 28°F | May 8 | October 3 |
Growing season: about 116 days.
Frequently asked questions
When is the last frost in Bozeman, MT?
The median date of the last spring frost (32°F) is May 26. In half of years the last frost comes earlier and in half it comes later, so waiting a week or two past May 26 lowers the risk for tender plants.
When is the first frost in Bozeman?
The median date of the first fall frost (32°F) is September 22, and a hard freeze (28°F) usually follows around October 3.
How long is the growing season in Bozeman?
About 116 days between the median last spring frost and first fall frost.
NOAA NCEI U.S. Climate Normals 1991-2020, station USC00241044. Median (50% probability) dates. Low spots and valleys can frost later in spring and earlier in fall than the station.