Tulsa, OK 74135 Frost Dates
74135, near Tulsa, OK: the frost window
Around 03/30 is the usual last spring frost, about 214 days away. 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
Tulsa'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.
How much risk comes with planting early here
03/30 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/10 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.
Tulsa against the rest of the dataset
About 220 days separate Tulsa's last and first frost, putting it 12,670 of 40,283 ZIP codes nationally. Within OK, it ranks 155 of 764.
Learn more
Two guides worth reading on 74135: local microclimates, on what one yard in Tulsa can differ from the 74135 normal, and zone vs. frost date, on why Zone 7b and Tulsa's frost date answer different questions.