Frost Dates for 44644 — Malvern, Ohio

Half of springs at Millport 4 NE, OH see their last 32°F night by May 2; only one in ten is past it by April 18, and one in ten still has one after May 20. Planting tender crops after May 10 leaves a 30% risk of a frost on them, after May 14 20%, and after May 20 10%. The 18 days between the even-odds date and the one-in-ten date is wider than at 76% of the 148 Ohio stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 13 in half of years, as early as October 1 one year in ten, and holds off past October 29 one year in ten. A hard freeze of 28°F follows 13 days later, around October 26; in spring the one-in-ten date for 28°F is May 9, 11 days before the 32°F one. The freeze-free season lasts 165 days in a typical year, shorter than at 93% of the 148 Ohio stations; it reaches 187 days one year in ten and falls short of 142 one year in ten. On average 139 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 14, and return around October 4. Severe cold of 16°F or below comes every winter, usually between December 2 and March 19.

July is the warmest month at Millport 4 NE, OH, averaging 82°F by day and 61°F at night; January is the coldest at 34°F and 19°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 54% of years.

Warmth for growing adds up to 2,823 growing degree days a year (base 50°F), fewer than at 90% of the 148 Ohio stations. 34% of them (957) have built up by the end of June, and July adds the most, 660.

The nearest other station, New Philadelphia, OH, 19 miles southwest of Malvern and 245 feet lower, has a last frost 2 days earlier (April 30), a first frost 2 days later (October 15), a season 2 days longer.

The first measurable snow (0.1 inch or more) in Malvern usually arrives around November 20, and the last of the season around March 26. Those are the middle dates across the winters of 1991–2020 at Louisville, OH, 11.1 miles away: half of years saw snow earlier, half later. Snow fell in 94% of those winters. The last 32°F night of spring typically comes 37 days after the last snow.

ZIP 44644 is 18 miles from Millport 4 NE, OH, which stands at 1,170 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 10 other ZIP codes share the station; its figures are presented in full for 44460 (Salem). The 2023 USDA Plant Hardiness Zone Map lists ZIP 44644 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.