Tulsa, OK 74129 Frost Dates
Frost dates for Tulsa, OK, ZIP 74129
Typically, the last spring freeze lands around 03/31, roughly 215 days out. The first fall frost typically arrives around 11/04, about 220 frost-free days later.
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.
What to do before the first frost
Zone 7b around Tulsa has about 10 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
Why 03/31 isn't a guarantee
03/31 is the middle of 30 years of NOAA records, not a promise. Plant by 03/11 and you're betting against frost in roughly 9 years out of 10. 04/15 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Tulsa compares
Tulsa's growing season runs about 220 days, ranking 12,668 of 40,283 US ZIP codes measured here, longest to shortest. Within OK, it ranks 153 of 764.
Learn more
zone vs. frost date explains why Zone 7b and Tulsa's frost date answer different questions, and the frost range explains how to read the range around Tulsa's dates instead of trusting one.