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Frost dates for Butte, Montana

In a typical year, Butte’s last spring frost lands around Jun 13 and the first fall frost around Sep 5, a growing season of about 84 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 Butte, Montana
OddsLast spring frostFirst fall frost
10 percentMay 27Aug 24
50 percentJun 13Sep 5
90 percentJul 1Sep 19

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 Butte 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 Butte, Montana?

Butte’s last spring frost falls around June 13 in a typical year. One year in ten it is done by May 27, and one year in ten frost holds on until July 1. Frost-sensitive planting usually waits for the late side of that band.

When is the first fall frost in Butte?

The first fall frost arrives around September 5 in a typical year, as early as August 24 in an early year and as late as September 19 in a late one.

How long is the growing season in Butte?

About 84 days, counted between the typical last spring frost and the typical first fall frost.

What USDA zone is Butte in?

Butte 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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