Ohio frost dates

Across Ohio, the average last spring frost is around April 25 and the average first fall frost around October 14 — roughly 172 frost-free days. USDA zones 5b, 6a, 6b.

Risk you accept	Last spring frost by	First fall frost by
Cautious (~10%)	May 9	September 30
Average (~50%)	April 25	October 14
Gambler (~90%)	April 11	October 28

→ Turn these into sowing dates with the Ohio planting calendar, or look up an exact ZIP code.

Statewide average from NOAA/NCEI freeze normals. Cautious/gambler dates are about two weeks either side of the average.