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Frost dates for Jamestown, North Dakota

In a typical year, Jamestown’s last spring frost lands around May 8 and the first fall frost around Sep 29, a growing season of about 144 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 Jamestown, North Dakota
OddsLast spring frostFirst fall frost
10 percentApr 26Sep 17
50 percentMay 8Sep 29
90 percentMay 21Oct 11

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 Jamestown is typically around 43°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 Jamestown, North Dakota?

Jamestown’s last spring frost falls around May 8 in a typical year. One year in ten it is done by April 26, and one year in ten frost holds on until May 21. Frost-sensitive planting usually waits for the late side of that band.

When is the first fall frost in Jamestown?

The first fall frost arrives around September 29 in a typical year, as early as September 17 in an early year and as late as October 11 in a late one.

How long is the growing season in Jamestown?

About 144 days, counted between the typical last spring frost and the typical first fall frost.

What USDA zone is Jamestown in?

Jamestown 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.

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