Frost Dates for 44509 — Youngstown, Ohio

Half of springs at Warren 3 S, OH see their last 32°F night by May 8; only one in ten is past it by April 23, and one in ten still has one after May 25. Planting tender crops after May 15 leaves a 30% risk of a frost on them, after May 19 20%, and after May 25 10%. The 17 days between the even-odds date and the one-in-ten date is narrower than at 24% of the 148 Ohio stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 12 in half of years, as early as September 30 one year in ten, and holds off past October 26 one year in ten. A hard freeze of 28°F follows 14 days later, around October 26; in spring the one-in-ten date for 28°F is May 15, 10 days before the 32°F one. The freeze-free season lasts 157 days in a typical year, shorter than at 98% of the 148 Ohio stations; it reaches 178 days one year in ten and falls short of 134 one year in ten. On average 147 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 19, and return around October 2. Severe cold of 16°F or below comes every winter, usually between November 30 and March 21.

July is the warmest month at Warren 3 S, OH, averaging 83°F by day and 59°F at night; January is the coldest at 35°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 August the chance of a 32°F night stays under 10% each month. In spring, May still brings one in 71% of years.

Warmth for growing adds up to 2,658 growing degree days a year (base 50°F), fewer than at 95% of the 148 Ohio stations. 34% of them (891) have built up by the end of June, and July adds the most, 642. Precipitation totals 40.8 inches a year, most in July (4.6") and least in February (2.3"); May to September bring 48% of it.

The nearest other station, Youngstown Regional Airport, OH, 10 miles north of Youngstown and 280 feet higher, has a last frost 7 days earlier (May 1), a first frost 5 days later (October 17), a season 10 days longer.

The first measurable snow (0.1 inch or more) in Youngstown usually arrives around December 1, and the last of the season around March 23. Those are the middle dates across the winters of 1991–2020 at Warren 3 S, OH, 8.9 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 46 days after the last snow.

ZIP 44509 is 9 miles from Warren 3 S, OH, which stands at 900 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 18 other ZIP codes share the station; its figures are presented in full for 44512 (Boardman). The 2023 USDA Plant Hardiness Zone Map lists ZIP 44509 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.