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Ohio Last Frost Date 2027

The average last spring frost (32°F, 50% chance) in Ohio falls between Apr 8 in Cuyahoga County and May 8 in Mahoning County. The first fall frost comes between Oct 10 (Knox County) and Nov 12 (Cuyahoga County).

Photo: Red and green azalea leaves edged with frost crystals on an autumn morning. Famartin, CC BY-SA 4.0, via Wikimedia Commons

Weathered red barn beside a freshly mown green lawn, Wayne County

When to plant in Ohio: crop by crop

Planting dates for each crop in Ohio, from the Ohio State University Extension calendar.

Tomatoes

Peppers

Potatoes

Sweet Corn

Green Beans

Cucumbers

Squash

Lettuce

Onions

Garlic

Peas

Watermelon

Ohio frost date questions

When is the last frost in Ohio?

The average last spring frost (32°F, 50% chance) in Ohio falls between Apr 8 in Cuyahoga County and May 8 in Mahoning County. The first fall frost comes between Oct 10 (Knox County) and Nov 12 (Cuyahoga County).

What does a 50% last frost date mean?

In half of the years from 1991 to 2020, the last 32°F night came on or after that date. Waiting until the 10% date cuts the risk to about 1 year in 10.

When is it safe to plant tomatoes in Ohio?

Tender crops such as tomatoes and peppers go out after the last frost. Use the 10% date for your county for a safer margin; the Ohio State University Extension planting calendar has the crop dates.

When is the first frost in Ohio?

The 50% first fall frost ranges from Oct 10 in Knox County to Nov 12 in Cuyahoga County.

How long is the growing season in Ohio?

Between 157 days (Mahoning County) and 217 days (Cuyahoga County) between the last and first 32°F freeze in half of years.

What is the difference between frost and a hard freeze?

These dates use 32°F, when tender plants are damaged. A 28°F hard freeze damages most hardy vegetables; the widget shows both.

Where do these frost dates come from?

NOAA NCEI U.S. Climate Normals for 1991 to 2020, freeze probability dates for each weather station. Each county uses its nearest station with a complete record.

Why does my county use a station in another county?

Not every county has a NOAA station with a full 30-year record. The station name, distance and elevation are listed so you can judge how close it is to your garden.

Photos: Red and green azalea leaves edged with frost crystals on an autumn morning: Famartin, CC BY-SA 4.0, via Wikimedia Commons; Farmstead and pasture below wooded hills west of Cumberland, Guernsey County: Nyttend, Public domain, via Wikimedia Commons; Weathered red barn beside a freshly mown green lawn, Wayne County: Tom Bower, CC BY 2.0, via Flickr; Unripe green tomato on the plant: Microrao, CC BY-SA 4.0, via Wikimedia Commons; Pepper plant in a kitchen garden loaded with green, yellow and red peppers: NPS, Public domain, via Wikimedia Commons; Potato plants growing in a home garden: Geo Lightspeed7, CC BY-SA 4.0, via Wikimedia Commons; Rows of sweet corn in a field: Wee Hong, CC BY-SA 4.0, via Wikimedia Commons; Clusters of long green bean pods hanging from a climbing bean vine: Nirajan_pant, CC BY-SA 3.0, via Wikimedia Commons; Cucumber plants growing in a greenhouse bed: HARTLEPOOLMARINA2014, CC BY-SA 4.0, via Wikimedia Commons; Harvested zucchini and summer squash: nociveglia from Appennino Emiliano, Italy, CC BY 2.0, via Wikimedia Commons; Lettuce plants growing in rows: AfroBrazilian, CC BY-SA 3.0, via Wikimedia Commons; Long rows of green onion plants growing in sandy farm soil: ליזי שאנן, CC BY 2.5, via Wikimedia Commons; Neat rows of young garlic shoots growing in dark tilled soil: Timothy A. Gonsalves, CC BY-SA 4.0, via Wikimedia Commons; Pea vines on a garden trellis with white flowers and flat green pods: Forest and Kim Starr, CC BY 2.0, via Wikimedia Commons; Young watermelon plant in a garden: Forest and Kim Starr, CC BY 3.0 us, via Wikimedia Commons.