Frost Dates for 43506 — Bryan, Ohio

Half of springs at Bryan 2 SE, OH see their last 32°F night by April 26; only one in ten is past it by April 14, and one in ten still has one after May 11. Planting tender crops after May 2 leaves a 30% risk of a frost on them, after May 6 20%, and after May 11 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 17 in half of years, as early as October 3 one year in ten, and holds off past October 30 one year in ten. A hard freeze of 28°F follows 11 days later, around October 28; in spring the one-in-ten date for 28°F is April 30, 11 days before the 32°F one. The freeze-free season lasts 170 days in a typical year, shorter than at 81% of the 148 Ohio stations; it reaches 190 days one year in ten and falls short of 150 one year in ten. On average 138 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 10 days longer, to about May 6, and return around October 5. Severe cold of 16°F or below comes every winter, usually between November 29 and March 14.

July is the warmest month at Bryan 2 SE, OH, averaging 85°F by day and 62°F at night; January is the coldest at 32°F and 17°F. A freezing night is all but certain in every month from October 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 34% of years.

Warmth for growing adds up to 3,015 growing degree days a year (base 50°F), fewer than at 78% of the 148 Ohio stations. 34% of them (1,035) have built up by the end of June, and July adds the most, 730. Precipitation totals 37.4 inches a year, most in May (4.0") and least in February (2.2"); May to September bring 49% of it.

The nearest other station, Montpelier, OH, 9 miles northwest of Bryan, has a last frost 2 days later (April 28), a first frost 1 day later (October 18), a season 3 days longer.

The first measurable snow (0.1 inch or more) in Bryan usually arrives around November 22, and the last of the season around April 2. Those are the middle dates across the winters of 1991–2020 at Stryker, OH, 8.2 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 24 days after the last snow.

ZIP 43506 is 2 miles from Bryan 2 SE, OH, which stands at 730 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 1 other ZIP code shares the station. The 2023 USDA Plant Hardiness Zone Map lists ZIP 43506 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.