Tulsa, OK 74120 Frost Dates
Tulsa, OK: when does the frost end?
Typically, the last spring freeze lands around 03/31, roughly 215 days out. Fall's first freeze usually shows up around 11/04, roughly 220 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Tulsa in Zone 7b (5 to 10°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
With roughly 10 weeks until Tulsa's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 03/31 isn't a guarantee
03/31 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/11 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/15 and only about 1 year in 10 sees frost after that.
Tulsa against the rest of the dataset
At roughly 220 frost-free days, Tulsa places 12,666 of 40,283 ZIP codes in this dataset. Within OK, it ranks 151 of 764.
Learn more
Before leaning on 74120's figures: the frost range explains how to read the range around Tulsa's dates instead of trusting one, while local microclimates explains what one yard in Tulsa can differ from the 74120 normal.