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Frost dates for Green Bay, Wisconsin

In a typical year, Green Bay’s last spring frost lands around Apr 30 and the first fall frost around Oct 9, a growing season of about 162 days. These are odds drawn from 30-year NOAA climate normals, not a promise. USDA zone 5b.

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

Last spring frost and first fall frost odds for Green Bay, Wisconsin
OddsLast spring frostFirst fall frost
10 percentApr 16Sep 24
50 percentApr 30Oct 9
90 percentMay 16Oct 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 Green Bay 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 Green Bay, Wisconsin?

Green Bay’s last spring frost falls around April 30 in a typical year. One year in ten it is done by April 16, and one year in ten frost holds on until May 16. Frost-sensitive planting usually waits for the late side of that band.

When is the first fall frost in Green Bay?

The first fall frost arrives around October 9 in a typical year, as early as September 24 in an early year and as late as October 26 in a late one.

How long is the growing season in Green Bay?

About 162 days, counted between the typical last spring frost and the typical first fall frost.

What USDA zone is Green Bay in?

Green Bay is in USDA hardiness zone 5b 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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