Colbert, OK 74733 Frost Dates
74733, near Colbert, OK: the frost window
The last spring frost here typically falls around 03/19, about 203 days from today. Fall's first freeze usually shows up around 11/12, roughly 237 days after the last spring frost.
Colbert sits in USDA Zone 8a (10 to 15°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.
Stretching the season past the first frost
Colbert's growing season runs out in roughly 11 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 03/19 isn't a guarantee
03/19 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/01 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/07 and only about 1 year in 10 sees frost after that.
Colbert against the rest of the dataset
Colbert's growing season runs about 237 days, ranking 9,135 of 40,283 US ZIP codes measured here, longest to shortest. Within OK, it ranks 10 of 764.
Learn more
Two guides worth reading on 74733: the frost range, on how to read the range around Colbert's dates instead of trusting one, and local microclimates, on what one yard in Colbert can differ from the 74733 normal.