Fort Supply, OK 73841 Frost Dates
Frost dates for Fort Supply, OK, ZIP 73841
The last spring frost here typically falls around 04/05, about 220 days from today. The first fall frost typically arrives around 10/30, about 206 frost-free days later.
The USDA Plant Hardiness Zone Map puts Fort Supply in Zone 7a (0 to 5°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 7a around Fort Supply has about 9 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
04/05 is the middle of 30 years of NOAA records, not a promise. Plant by 03/19 and you're betting against frost in roughly 9 years out of 10. 04/23 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Fort Supply compares
At roughly 206 frost-free days, Fort Supply places 16,115 of 40,283 ZIP codes in this dataset. Within OK, it ranks 566 of 764.
Learn more
the frost range explains how to read the range around Fort Supply's dates instead of trusting one, and local microclimates explains what one yard in Fort Supply can differ from the 73841 normal.