Tulsa, OK 74128 Frost Dates
Tulsa, OK: when does the frost end?
Around 03/31 is the usual last spring frost, about 215 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
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.
How much risk comes with planting early here
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
Tulsa's growing season runs about 220 days, ranking 12,667 of 40,283 US ZIP codes measured here, longest to shortest. Within OK, it ranks 152 of 764.
Learn more
Before leaning on 74128's figures: local microclimates explains what one yard in Tulsa can differ from the 74128 normal, while zone vs. frost date explains why Zone 7b and Tulsa's frost date answer different questions.