Frost Dates for 43777 — Roseville, Ohio

Half of springs at Philo 3 SW, OH see their last 32°F night by April 19; only one in ten is past it by April 2, and one in ten still has one after May 9. Planting tender crops after April 27 leaves a 30% risk of a frost on them, after April 30 20%, and after May 9 10%. The 20 days between the even-odds date and the one-in-ten date is wider than at 98% of the 148 Ohio stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 25 in half of years, as early as October 9 one year in ten, and holds off past November 7 one year in ten. A hard freeze of 28°F follows 11 days later, around November 5; in spring the one-in-ten date for 28°F is April 21, 18 days before the 32°F one. The freeze-free season lasts 189 days in a typical year, longer than at 80% of the 148 Ohio stations; it reaches 211 days one year in ten and falls short of 162 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 12 days longer, to about May 1, and return around October 13. Severe cold of 16°F or below comes every winter, usually between December 13 and March 5.

July is the warmest month at Philo 3 SW, OH, averaging 84°F by day and 64°F at night; January is the coldest at 38°F and 23°F. A freezing night is all but certain in every month from November to March (a 90% chance or more). From June to September the chance of a 32°F night stays under 10% each month. In spring, April still brings one in 90% of years and May still brings one in 20% of years.

Warmth for growing adds up to 3,569 growing degree days a year (base 50°F), more than at 82% of the 148 Ohio stations. 37% of them (1,315) have built up by the end of June, and July adds the most, 749. Precipitation totals 39.6 inches a year, most in June (4.5") and least in February (2.1"); May to September bring 49% of it.

The nearest other station, New Lexington 2 NW, OH, 9 miles southwest of Roseville, has a last frost 11 days later (April 30), a first frost 8 days earlier (October 17), a season 21 days shorter.

The first measurable snow (0.1 inch or more) in Roseville usually arrives around December 2, and the last of the season around March 13. Those are the middle dates across the winters of 1991–2020 at Philo 3 SW, OH, 8.7 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 37 days after the last snow.

ZIP 43777 is 9 miles from Philo 3 SW, OH, which stands at 1,020 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 43777 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.