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Frost dates for Kalispell, Montana

In a typical year, Kalispell’s last spring frost lands around May 31 and the first fall frost around Sep 10, a growing season of about 102 days. These are odds drawn from 30-year NOAA climate normals, not a promise. USDA zone 5b.

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

Last spring frost and first fall frost odds for Kalispell, Montana
OddsLast spring frostFirst fall frost
10 percentMay 13Aug 26
50 percentMay 31Sep 10
90 percentJun 22Sep 25

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 Kalispell is typically around 40°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 Kalispell, Montana?

Kalispell’s last spring frost falls around May 31 in a typical year. One year in ten it is done by May 13, and one year in ten frost holds on until June 22. Frost-sensitive planting usually waits for the late side of that band.

When is the first fall frost in Kalispell?

The first fall frost arrives around September 10 in a typical year, as early as August 26 in an early year and as late as September 25 in a late one.

How long is the growing season in Kalispell?

About 102 days, counted between the typical last spring frost and the typical first fall frost.

What USDA zone is Kalispell in?

Kalispell is in USDA hardiness zone 5b 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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