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Frost dates for Gillette, Wyoming

In a typical year, Gillette’s last spring frost lands around May 15 and the first fall frost around Oct 1, a growing season of about 139 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 Gillette, Wyoming
OddsLast spring frostFirst fall frost
10 percentMay 1Sep 15
50 percentMay 15Oct 1
90 percentMay 27Oct 14

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 Gillette is typically around 45°F at 4 inches this time of year, estimated from the last two weeks of normal air temperatures.

See what is plantable in your ZIP with the what-to-plant lookup.

Common questions

When is the last frost in Gillette, Wyoming?

Gillette’s last spring frost falls around May 15 in a typical year. One year in ten it is done by May 1, and one year in ten frost holds on until May 27. Frost-sensitive planting usually waits for the late side of that band.

When is the first fall frost in Gillette?

The first fall frost arrives around October 1 in a typical year, as early as September 15 in an early year and as late as October 14 in a late one.

How long is the growing season in Gillette?

About 139 days, counted between the typical last spring frost and the typical first fall frost.

What USDA zone is Gillette in?

Gillette 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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