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Frost dates for Hermiston, Oregon

In a typical year, Hermiston’s last spring frost lands around Apr 26 and the first fall frost around Oct 10, a growing season of about 167 days. These are odds drawn from 30-year NOAA climate normals, not a promise. USDA zone 7b.

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

Last spring frost and first fall frost odds for Hermiston, Oregon
OddsLast spring frostFirst fall frost
10 percentApr 9Sep 25
50 percentApr 26Oct 10
90 percentMay 10Oct 26

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 Hermiston is typically around 51°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 Hermiston, Oregon?

Hermiston’s last spring frost falls around April 26 in a typical year. One year in ten it is done by April 9, and one year in ten frost holds on until May 10. Frost-sensitive planting usually waits for the late side of that band.

When is the first fall frost in Hermiston?

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

How long is the growing season in Hermiston?

About 167 days, counted between the typical last spring frost and the typical first fall frost.

What USDA zone is Hermiston in?

Hermiston is in USDA hardiness zone 7b 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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