North Royalton, OH 44133 Frost Dates
Frost dates for North Royalton, OH, ZIP 44133
Typically, the last spring freeze lands around 04/20, roughly 235 days out. The first fall frost typically arrives around 11/03, about 198 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 North Royalton, not a forecast for this year.
What to do before the first frost
Zone 6b around North Royalton has about 10 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 04/20 isn't a guarantee
04/20 is the middle of 30 years of NOAA records, not a promise. Plant by 04/04 and you're betting against frost in roughly 9 years out of 10. 05/05 is the safer bet, historically only a 1-in-10 chance of frost that late.
How North Royalton compares
North Royalton's growing season runs about 198 days, ranking 18,287 of 40,283 US ZIP codes measured here, longest to shortest. Within OH, it ranks 87 of 1,383.
Learn more
the frost range explains how to read the range around North Royalton's dates instead of trusting one, and local microclimates explains what one yard in North Royalton can differ from the 44133 normal.