Frost Dates for 43230 — Gahanna, Ohio

Half of springs at Columbus Port Columbus International Airport, OH see their last 32°F night by April 18; only one in ten is past it by April 4, and one in ten still has one after May 5. Planting tender crops after April 24 leaves a 30% risk of a frost on them, after April 29 20%, and after May 5 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 27 in half of years, as early as October 14 one year in ten, and holds off past November 7 one year in ten. A hard freeze of 28°F follows 10 days later, around November 6; in spring the one-in-ten date for 28°F is April 21, 14 days before the 32°F one. The freeze-free season lasts 191 days in a typical year, longer than at 84% of the 148 Ohio stations; it reaches 209 days one year in ten and falls short of 169 one year in ten. On average 103 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 April 29, and return around October 16. Severe cold of 16°F or below comes every winter, usually between December 14 and March 5.

July is the warmest month at Columbus Port Columbus International Airport, OH, averaging 85°F by day and 65°F at night; January is the coldest at 37°F and 22°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 17% of years.

Warmth for growing adds up to 3,607 growing degree days a year (base 50°F), more than at 85% of the 148 Ohio stations. 36% of them (1,302) have built up by the end of June, and July adds the most, 787. Precipitation totals 41.5 inches a year, most in July (4.7") and least in February (2.4"); May to September bring 48% of it.

The nearest other station, Westerville, OH, 7 miles northwest of Gahanna, has a last frost 4 days later (April 22), a first frost 3 days earlier (October 24), a season 8 days shorter.

The first measurable snow (0.1 inch or more) in Gahanna usually arrives around November 21, and the last of the season around March 29. Those are the middle dates across the winters of 1991–2020 at Columbus Port Columbus International Airport, OH, 3.4 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 20 days after the last snow.

ZIP 43230 is 3 miles from Columbus Port Columbus International Airport, OH, which stands at 810 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 7 other ZIP codes share the station. The 2023 USDA Plant Hardiness Zone Map lists ZIP 43230 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.