Norman, OK 73026 Frost Dates
73026, near Norman, OK: the frost window
Around 03/31 is the usual last spring frost, about 215 days away. Fall's first freeze usually shows up around 11/05, roughly 219 days after the last spring frost.
Norman sits in USDA Zone 7b (5 to 10°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
Norman's growing season runs out in roughly 10 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Norman's last frost
03/31 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/12 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/17 and only about 1 year in 10 sees frost after that.
Norman against the rest of the dataset
At roughly 219 frost-free days, Norman places 12,921 of 40,283 ZIP codes in this dataset. Within OK, it ranks 214 of 764.
Learn more
Two guides worth reading on 73026: the frost range, on how to read the range around Norman's dates instead of trusting one, and local microclimates, on what one yard in Norman can differ from the 73026 normal.