Frost Dates for 45308 — Bradford, Ohio

Half of springs at Piqua Wwtp, OH see their last 32°F night by April 18; only one in ten is past it by April 5, 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 29 20%, and after May 5 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 23 in half of years, as early as October 9 one year in ten, and holds off past November 4 one year in ten. A hard freeze of 28°F follows 11 days later, around November 3; in spring the one-in-ten date for 28°F is April 20, 15 days before the 32°F one. The freeze-free season lasts 186 days in a typical year, longer than at 71% of the 148 Ohio stations; it reaches 206 days one year in ten and falls short of 164 one year in ten. On average 111 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 April 29, and return around October 13. Severe cold of 16°F or below comes every winter, usually between December 10 and March 5.

July is the warmest month at Piqua Wwtp, OH, averaging 84°F by day and 65°F at night; January is the coldest at 36°F and 21°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 17% of years.

Warmth for growing adds up to 3,450 growing degree days a year (base 50°F), more than at 74% of the 148 Ohio stations. 37% of them (1,262) have built up by the end of June, and July adds the most, 756. Precipitation totals 40.9 inches a year, most in May (4.4") and least in February (2.3"); May to September bring 47% of it.

The nearest other station, Greenville Wtp, OH, 11 miles west of Bradford and 177 feet higher, has a last frost 3 days later (April 21), a first frost 3 days earlier (October 20), a season 6 days shorter.

The first measurable snow (0.1 inch or more) in Bradford usually arrives around December 13, and the last of the season around March 16. Those are the middle dates across the winters of 1991–2020 at Versailles, OH, 7 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 33 days after the last snow.

ZIP 45308 is 11 miles from Piqua Wwtp, OH, which stands at 853 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 4 other ZIP codes share the station; its figures are presented in full for 45373 (Troy). The 2023 USDA Plant Hardiness Zone Map lists ZIP 45308 in zone 6a, the band where the coldest night of the year averaged -10 to -5°F (-23.3 to -20.6°C) over 1991–2020; a zone describes winter lows, not frost dates.