Upper Arlington, OH 43221 Frost Dates
Frost dates for Upper Arlington, OH, ZIP 43221
Typically, the last spring freeze lands around 04/20, roughly 235 days out. The first fall frost typically arrives around 10/24, about 185 frost-free days later.
Zone 6b (-5 to 0°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Upper Arlington, not a forecast for this year.
What to do before the first frost
Zone 6b around Upper Arlington 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.
How much risk comes with planting early here
04/20 is the middle of 30 years of NOAA records, not a promise. Plant by 04/05 and you're betting against frost in roughly 9 years out of 10. 05/07 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Upper Arlington compares
Upper Arlington's growing season runs about 185 days, ranking 23,059 of 40,283 US ZIP codes measured here, longest to shortest. Within OH, it ranks 535 of 1,383.
Learn more
local microclimates explains what one yard in Upper Arlington can differ from the 43221 normal, and zone vs. frost date explains why Zone 6b and Upper Arlington's frost date answer different questions.