Millerton, OK 74750 Frost Dates
74750, near Millerton, OK: the frost window
Typically, the last spring freeze lands around 03/20, roughly 204 days out. Fall's first freeze usually shows up around 11/10, roughly 233 days after the last spring frost.
Zone 8a (10 to 15°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 Millerton, not a forecast for this year.
Stretching the season past the first frost
Millerton'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 03/20 isn't a guarantee
03/20 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/28 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/11 and only about 1 year in 10 sees frost after that.
Millerton against the rest of the dataset
Millerton's growing season runs about 233 days, ranking 9,988 of 40,283 US ZIP codes measured here, longest to shortest. Within OK, it ranks 28 of 764.
Learn more
Two guides worth reading on 74750: the frost range, on how to read the range around Millerton's dates instead of trusting one, and local microclimates, on what one yard in Millerton can differ from the 74750 normal.