Frost Dates for 45211 — Cincinnati, Ohio

Half of springs at Cheviot, OH see their last 32°F night by April 17; only one in ten is past it by April 2, and one in ten still has one after May 5. Planting tender crops after April 24 leaves a 30% risk of a frost on them, after April 30 20%, and after May 5 10%. The 18 days between the even-odds date and the one-in-ten date is wider than at 76% of the 148 Ohio stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 26 in half of years, as early as October 11 one year in ten, and holds off past November 7 one year in ten. A hard freeze of 28°F follows 9 days later, around November 4; in spring the one-in-ten date for 28°F is April 21, 14 days before the 32°F one. The freeze-free season lasts 191 days in a typical year, longer than at 84% of the 148 Ohio stations; it reaches 211 days one year in ten and falls short of 168 one year in ten. On average 106 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 12 days longer, to about April 29, and return around October 16. Severe cold of 16°F or below comes every winter, usually between December 11 and March 4.

July is the warmest month at Cheviot, OH, averaging 85°F by day and 65°F at night; January is the coldest at 37°F and 22°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 19% of years.

Warmth for growing adds up to 3,702 growing degree days a year (base 50°F), more than at 89% of the 148 Ohio stations. 37% of them (1,351) have built up by the end of June, and July adds the most, 787. Precipitation totals 48.3 inches a year, most in May (5.2") and least in February (3.2"); May to September bring 44% of it.

The nearest other station, Cheviot 3 W, OH, 4 miles west of Cincinnati, has a last frost 1 day earlier (April 16), a first frost 2 days later (October 28), a season 2 days longer.

The first measurable snow (0.1 inch or more) in Cincinnati usually arrives around December 7, and the last of the season around March 16. Those are the middle dates across the winters of 1991–2020 at Cheviot, OH, 1 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 32 days after the last snow.

ZIP 45211 is 1 mile from Cheviot, OH, which stands at 891 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 14 other ZIP codes share the station; its figures are presented in full for 45238 (Cincinnati). The 2023 USDA Plant Hardiness Zone Map lists ZIP 45211 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.