Wainwright, OK 74468 Frost Dates
74468, near Wainwright, OK: the frost window
The last spring frost here typically falls around 04/02, about 217 days from today. Fall's first freeze usually shows up around 11/02, roughly 216 days after the last spring frost.
Zone 7b (5 to 10°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 Wainwright, not a forecast for this year.
Stretching the season past the first frost
Wainwright's growing season runs out in roughly 9 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 04/02 isn't a guarantee
04/02 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/13 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/20 and only about 1 year in 10 sees frost after that.
Wainwright against the rest of the dataset
About 216 days separate Wainwright's last and first frost, putting it 13,940 of 40,283 ZIP codes nationally. Within OK, it ranks 362 of 764.
Learn more
Two guides worth reading on 74468: local microclimates, on what one yard in Wainwright can differ from the 74468 normal, and zone vs. frost date, on why Zone 7b and Wainwright's frost date answer different questions.