Skip to content

Frost dates for Portsmouth, Ohio

In a typical year, Portsmouth’s last spring frost lands around Apr 17 and the first fall frost around Oct 25, a growing season of about 191 days. These are odds drawn from 30-year NOAA climate normals, not a promise. USDA zone 7a.

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

Last spring frost and first fall frost odds for Portsmouth, Ohio
OddsLast spring frostFirst fall frost
10 percentApr 3Oct 11
50 percentApr 17Oct 25
90 percentMay 5Nov 6

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 Portsmouth is typically around 54°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 Portsmouth, Ohio?

Portsmouth’s last spring frost falls around April 17 in a typical year. One year in ten it is done by April 3, and one year in ten frost holds on until May 5. Frost-sensitive planting usually waits for the late side of that band.

When is the first fall frost in Portsmouth?

The first fall frost arrives around October 25 in a typical year, as early as October 11 in an early year and as late as November 6 in a late one.

How long is the growing season in Portsmouth?

About 191 days, counted between the typical last spring frost and the typical first fall frost.

What USDA zone is Portsmouth in?

Portsmouth 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

Row & Bed is a plant reference built around your garden: your zone, your frost dates, your forecast, and a cited page for every variety in your beds.

Set up your garden