Frost Dates for 45882 — Rockford, Ohio

Half of springs at Celina 3 NE, OH see their last 32°F night by April 27; only one in ten is past it by April 12, and one in ten still has one after May 10. Planting tender crops after May 2 leaves a 30% risk of a frost on them, after May 6 20%, and after May 10 10%. The 13 days between the even-odds date and the one-in-ten date is narrower than at 97% of the 148 Ohio stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 19 in half of years, as early as October 3 one year in ten, and holds off past November 1 one year in ten. A hard freeze of 28°F follows 12 days later, around October 31; in spring the one-in-ten date for 28°F is May 2, 8 days before the 32°F one. The freeze-free season lasts 175 days in a typical year, shorter than at 68% of the 148 Ohio stations; it reaches 195 days one year in ten and falls short of 154 one year in ten. On average 116 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 8 days longer, to about May 5, and return around October 5. Severe cold of 16°F or below comes every winter, usually between December 1 and March 14.

July is the warmest month at Celina 3 NE, OH, averaging 84°F by day and 63°F at night; January is the coldest at 34°F and 19°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 35% of years.

Warmth for growing adds up to 3,272 growing degree days a year (base 50°F), more than at 55% of the 148 Ohio stations. 36% of them (1,175) have built up by the end of June, and July adds the most, 724. Precipitation totals 40.1 inches a year, most in July (4.6") and least in February (2.3"); May to September bring 49% of it.

The nearest other station, Van Wert 1 S, OH, 13 miles northeast of Rockford, has a last frost 6 days earlier (April 21), a first frost 7 days later (October 26), a season 12 days longer.

The first measurable snow (0.1 inch or more) in Rockford usually arrives around November 30, and the last of the season around March 24. Those are the middle dates across the winters of 1991–2020 at Celina 3 NE, OH, 10.8 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 34 days after the last snow.

ZIP 45882 is 11 miles from Celina 3 NE, OH, which stands at 866 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 7 other ZIP codes share the station; its figures are presented in full for 45822 (Celina). The 2023 USDA Plant Hardiness Zone Map lists ZIP 45882 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.