Stillwater, OK 74075 Frost Dates
Frost dates for Stillwater, OK, ZIP 74075
Typically, the last spring freeze lands around 04/03, roughly 218 days out. The first fall frost typically arrives around 10/31, about 209 frost-free days later.
Stillwater sits in USDA Zone 7a (0 to 5°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
What to do before the first frost
Zone 7a around Stillwater 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.
Why 04/03 isn't a guarantee
04/03 is the middle of 30 years of NOAA records, not a promise. Plant by 03/18 and you're betting against frost in roughly 9 years out of 10. 04/21 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Stillwater compares
At roughly 209 frost-free days, Stillwater places 15,139 of 40,283 ZIP codes in this dataset. Within OK, it ranks 492 of 764.
Learn more
local microclimates explains what one yard in Stillwater can differ from the 74075 normal, and zone vs. frost date explains why Zone 7a and Stillwater's frost date answer different questions.