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Frost dates for Pullman, Washington

In a typical year, Pullman’s last spring frost lands around May 6 and the first fall frost around Sep 29, a growing season of about 146 days. These are odds drawn from 30-year NOAA climate normals, not a promise. USDA zone 6b.

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

Last spring frost and first fall frost odds for Pullman, Washington
OddsLast spring frostFirst fall frost
10 percentApr 22Sep 9
50 percentMay 6Sep 29
90 percentMay 25Oct 15

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 Pullman is typically around 47°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 Pullman, Washington?

Pullman’s last spring frost falls around May 6 in a typical year. One year in ten it is done by April 22, and one year in ten frost holds on until May 25. Frost-sensitive planting usually waits for the late side of that band.

When is the first fall frost in Pullman?

The first fall frost arrives around September 29 in a typical year, as early as September 9 in an early year and as late as October 15 in a late one.

How long is the growing season in Pullman?

About 146 days, counted between the typical last spring frost and the typical first fall frost.

What USDA zone is Pullman in?

Pullman is in USDA hardiness zone 6b 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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