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Frost dates for Saint Louis, Missouri

In a typical year, Saint Louis’s last spring frost lands around Apr 1 and the first fall frost around Nov 4, a growing season of about 217 days. These are odds drawn from 30-year NOAA climate normals, not a promise. USDA zone 7a.

Right now the growing season is open, with about 10 days until the typical first fall frost.

Last spring frost and first fall frost odds for Saint Louis, Missouri
OddsLast spring frostFirst fall frost
10 percentMar 14Oct 24
50 percentApr 1Nov 4
90 percentApr 18Nov 21

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 Saint Louis is typically around 58°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 Saint Louis, Missouri?

Saint Louis’s last spring frost falls around April 1 in a typical year. One year in ten it is done by March 14, and one year in ten frost holds on until April 18. Frost-sensitive planting usually waits for the late side of that band.

When is the first fall frost in Saint Louis?

The first fall frost arrives around November 4 in a typical year, as early as October 24 in an early year and as late as November 21 in a late one.

How long is the growing season in Saint Louis?

About 217 days, counted between the typical last spring frost and the typical first fall frost.

What USDA zone is Saint Louis in?

Saint Louis is in USDA hardiness zone 7a 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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