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Frost dates for Jackson, Wyoming

In a typical year, Jackson’s last spring frost lands around Jun 20 and the first fall frost around Aug 31, a growing season of about 72 days. These are odds drawn from 30-year NOAA climate normals, not a promise. USDA zone 4b.

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

Last spring frost and first fall frost odds for Jackson, Wyoming
OddsLast spring frostFirst fall frost
10 percentJun 5Aug 12
50 percentJun 20Aug 31
90 percentJul 9Sep 13

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 Jackson is typically around 39°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 Jackson, Wyoming?

Jackson’s last spring frost falls around June 20 in a typical year. One year in ten it is done by June 5, and one year in ten frost holds on until July 9. Frost-sensitive planting usually waits for the late side of that band.

When is the first fall frost in Jackson?

The first fall frost arrives around August 31 in a typical year, as early as August 12 in an early year and as late as September 13 in a late one.

How long is the growing season in Jackson?

About 72 days, counted between the typical last spring frost and the typical first fall frost.

What USDA zone is Jackson in?

Jackson is in USDA hardiness zone 4b 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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