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Frost dates for Saint Marys, Pennsylvania

In a typical year, Saint Marys’s last spring frost lands around May 14 and the first fall frost around Oct 6, a growing season of about 145 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 Saint Marys, Pennsylvania
OddsLast spring frostFirst fall frost
10 percentApr 28Sep 24
50 percentMay 14Oct 6
90 percentMay 29Oct 20

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 Marys is typically around 47°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 Marys, Pennsylvania?

Saint Marys’s last spring frost falls around May 14 in a typical year. One year in ten it is done by April 28, and one year in ten frost holds on until May 29. Frost-sensitive planting usually waits for the late side of that band.

When is the first fall frost in Saint Marys?

The first fall frost arrives around October 6 in a typical year, as early as September 24 in an early year and as late as October 20 in a late one.

How long is the growing season in Saint Marys?

About 145 days, counted between the typical last spring frost and the typical first fall frost.

What USDA zone is Saint Marys in?

Saint Marys 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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