Frost Dates for 43612 — Toledo, Ohio

Half of springs at Toledo Metcalf Field, OH see their last 32°F night by April 20; only one in ten is past it by April 5, and one in ten still has one after May 7. Planting tender crops after April 27 leaves a 30% risk of a frost on them, after May 1 20%, and after May 7 10%. The 17 days between the even-odds date and the one-in-ten date is narrower than at 24% of the 148 Ohio stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 27 in half of years, as early as October 14 one year in ten, and holds off past November 9 one year in ten. A hard freeze of 28°F follows 11 days later, around November 7; in spring the one-in-ten date for 28°F is April 25, 12 days before the 32°F one. The freeze-free season lasts 188 days in a typical year, longer than at 76% of the 148 Ohio stations; it reaches 209 days one year in ten and falls short of 167 one year in ten. On average 118 nights a year drop to 32°F or below. Nights of 36°F, when frost can still settle on leaves in low, open spots, continue 11 days longer, to about May 1, and return around October 15. Severe cold of 16°F or below comes every winter, usually between December 8 and March 10.

July is the warmest month at Toledo Metcalf Field, OH, averaging 85°F by day and 65°F at night; January is the coldest at 34°F and 20°F. A freezing night is all but certain in every month from November to April (a 90% chance or more). From June to September the chance of a 32°F night stays under 10% each month. In spring, May still brings one in 21% of years.

Warmth for growing adds up to 3,283 growing degree days a year (base 50°F), more than at 59% of the 148 Ohio stations. 34% of them (1,119) have built up by the end of June, and July adds the most, 766. Precipitation totals 32.5 inches a year, most in May (3.5") and least in January (1.8"); May to September bring 51% of it.

The nearest other station, Toledo Express Airport, OH, 15 miles southwest of Toledo, has a last frost 2 days later (April 22), a first frost 3 days earlier (October 24).

The first measurable snow (0.1 inch or more) in Toledo usually arrives around November 24, and the last of the season around April 1. Those are the middle dates across the winters of 1991–2020 at Toledo Express Airport, OH, 15 miles away: half of years saw snow earlier, half later. Every one of those winters saw snow. The last 32°F night of spring typically comes 19 days after the last snow.

ZIP 43612 is 11 miles from Toledo Metcalf Field, OH, which stands at 622 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 21 other ZIP codes share the station; its figures are presented in full for 43551 (Perrysburg). The 2023 USDA Plant Hardiness Zone Map lists ZIP 43612 in zone 6b, the band where the coldest night of the year averaged -5 to 0°F (-20.6 to -17.8°C) over 1991–2020; a zone describes winter lows, not frost dates.