Oklahoma City, OK 73108 Frost Dates
73108, near Oklahoma City, OK: the frost window
Typically, the last spring freeze lands around 04/04, roughly 219 days out. Fall's first freeze usually shows up around 11/02, roughly 213 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 Oklahoma City, not a forecast for this year.
Stretching the season past the first frost
Oklahoma City'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 04/04 isn't a guarantee
04/04 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/16 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.
Oklahoma City against the rest of the dataset
At roughly 213 frost-free days, Oklahoma City places 14,400 of 40,283 ZIP codes in this dataset. Within OK, it ranks 390 of 764.
Learn more
Two guides worth reading on 73108: the frost range, on how to read the range around Oklahoma City's dates instead of trusting one, and local microclimates, on what one yard in Oklahoma City can differ from the 73108 normal.