Frost Dates for 43566 — Waterville, Ohio

Half of springs at Toledo Express Airport, OH see their last 32°F night by April 22; only one in ten is past it by April 6, and one in ten still has one after May 7. Planting tender crops after April 29 leaves a 30% risk of a frost on them, after May 3 20%, and after May 7 10%. The 15 days between the even-odds date and the one-in-ten date is narrower than at 77% of the 148 Ohio stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 24 in half of years, as early as October 11 one year in ten, and holds off past November 8 one year in ten. A hard freeze of 28°F follows 11 days later, around November 4; 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 206 days one year in ten and falls short of 168 one year in ten. On average 123 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 9 days longer, to about May 1, and return around October 13. Severe cold of 16°F or below comes every winter, usually between December 8 and March 11.

July is the warmest month at Toledo Express Airport, OH, averaging 87°F by day and 64°F at night; January is the coldest at 35°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 26% of years.

Warmth for growing adds up to 3,434 growing degree days a year (base 50°F), more than at 73% of the 148 Ohio stations. 35% of them (1,191) have built up by the end of June, and July adds the most, 786. Precipitation totals 35.2 inches a year, most in May (3.8") and least in February (2.3"); May to September bring 47% of it.

The nearest other station, Bowling Green Wwtp, OH, 10 miles southeast of Waterville, has the same 50% last-frost date, a first frost 1 day later (October 25), a season 2 days shorter.

The first measurable snow (0.1 inch or more) in Waterville 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, 6.9 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 21 days after the last snow.

ZIP 43566 is 7 miles from Toledo Express Airport, OH, which stands at 669 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 10 other ZIP codes share the station; its figures are presented in full for 43615 (Toledo). The 2023 USDA Plant Hardiness Zone Map lists ZIP 43566 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.