Westerville, OH 43240 Frost Dates
Frost dates for Westerville, OH, ZIP 43240
The last spring frost here typically falls around 04/22, about 237 days from today. The first fall frost typically arrives around 10/23, about 183 frost-free days later.
The USDA Plant Hardiness Zone Map puts Westerville in Zone 6b (-5 to 0°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
Zone 6b around Westerville has about 8 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
Why 04/22 isn't a guarantee
04/22 is the middle of 30 years of NOAA records, not a promise. Plant by 04/06 and you're betting against frost in roughly 9 years out of 10. 05/09 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Westerville compares
Westerville's growing season runs about 183 days, ranking 23,758 of 40,283 US ZIP codes measured here, longest to shortest. Within OH, it ranks 686 of 1,383.
Learn more
zone vs. frost date explains why Zone 6b and Westerville's frost date answer different questions, and the frost range explains how to read the range around Westerville's dates instead of trusting one.