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Frost dates for Bozeman, Montana

In a typical year, Bozeman’s last spring frost lands around May 26 and the first fall frost around Sep 22, a growing season of about 119 days. These are odds drawn from 30-year NOAA climate normals, not a promise. USDA zone 5a.

Right now the typical frost season has arrived; planting waits for spring.

Last spring frost and first fall frost odds for Bozeman, Montana
OddsLast spring frostFirst fall frost
10 percentMay 9Sep 5
50 percentMay 26Sep 22
90 percentJun 14Oct 5

A 10 percent year is an early year, a 90 percent year a late one. Frost-sensitive planting usually waits for the 90 percent side of the last-frost band.

Soil in Bozeman is typically around 44°F at 4 inches this time of year, estimated from the last two weeks of normal air temperatures.

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Common questions

When is the last frost in Bozeman, Montana?

Bozeman’s last spring frost falls around May 26 in a typical year. One year in ten it is done by May 9, and one year in ten frost holds on until June 14. Frost-sensitive planting usually waits for the late side of that band.

When is the first fall frost in Bozeman?

The first fall frost arrives around September 22 in a typical year, as early as September 5 in an early year and as late as October 5 in a late one.

How long is the growing season in Bozeman?

About 119 days, counted between the typical last spring frost and the typical first fall frost.

What USDA zone is Bozeman in?

Bozeman is in USDA hardiness zone 5a under the 2023 USDA Plant Hardiness Zone Map.

Dates come from 30-year NOAA climate normals for the nearest reporting station. They describe odds, not a forecast.

Nearby cities

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