Frost Dates for 44089 — Vermilion, Ohio

Half of springs at Elyria Lorain Co Airport, OH see their last 32°F night by April 24; only one in ten is past it by April 9, and one in ten still has one after May 10. Planting tender crops after April 30 leaves a 30% risk of a frost on them, after May 4 20%, and after May 10 10%. The 16 days between the even-odds date and the one-in-ten date is narrower than at 53% of the 148 Ohio stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 24 in half of years, as early as October 8 one year in ten, and holds off past November 6 one year in ten. A hard freeze of 28°F follows 11 days later, around November 4; in spring the one-in-ten date for 28°F is April 26, 14 days before the 32°F one. The freeze-free season lasts 182 days in a typical year, longer than at 55% of the 148 Ohio stations; it reaches 204 days one year in ten and falls short of 160 one year in ten. On average 115 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 May 5, and return around October 10. Severe cold of 16°F or below comes every winter, usually between December 8 and March 11.

July is the warmest month at Elyria Lorain Co Airport, OH, averaging 82°F by day and 62°F at night; January is the coldest at 34°F and 20°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 30% of years.

Warmth for growing adds up to 2,930 growing degree days a year (base 50°F), fewer than at 84% of the 148 Ohio stations. 34% of them (1,009) have built up by the end of June, and July adds the most, 690. Precipitation totals 36.8 inches a year, most in June (3.9") and least in February (1.7"); May to September bring 50% of it.

The nearest other station, Oberlin, OH, 12 miles southeast of Vermilion, has a last frost 3 days later (April 27), a first frost 2 days earlier (October 22), a season 4 days shorter.

The first measurable snow (0.1 inch or more) in Vermilion usually arrives around November 26, and the last of the season around March 31. Those are the middle dates across the winters of 1991–2020 at Oberlin, OH, 11.6 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 44089 is 11 miles from Elyria Lorain Co Airport, OH, which stands at 794 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 3 other ZIP codes share the station; its figures are presented in full for 44052 (Lorain). The 2023 USDA Plant Hardiness Zone Map lists ZIP 44089 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.