Stillwater, OK 74074 Frost Dates
74074, near Stillwater, OK: the frost window
The last spring frost here typically falls around 04/05, about 220 days from today. Fall's first freeze usually shows up around 10/30, roughly 206 days after the last spring frost.
Zone 7a (0 to 5°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 Stillwater, not a forecast for this year.
Stretching the season past the first frost
Stillwater'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 04/05 isn't a guarantee
04/05 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/21 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/21 and only about 1 year in 10 sees frost after that.
Stillwater against the rest of the dataset
Stillwater's growing season runs about 206 days, ranking 15,930 of 40,283 US ZIP codes measured here, longest to shortest. Within OK, it ranks 540 of 764.
Learn more
Two guides worth reading on 74074: zone vs. frost date, on why Zone 7a and Stillwater's frost date answer different questions, and the frost range, on how to read the range around Stillwater's dates instead of trusting one.