Tulsa, OK 74103 Frost Dates
Frost dates for Tulsa, OK, ZIP 74103
Around 03/31 is the usual last spring frost, about 215 days away. The first fall frost typically arrives around 11/04, about 220 frost-free days later.
Tulsa 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.
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
About 220 days separate Tulsa's last and first frost, putting it 12,657 of 40,283 ZIP codes nationally. Within OK, it ranks 142 of 764.
Learn more
the frost range explains how to read the range around Tulsa's dates instead of trusting one, and local microclimates explains what one yard in Tulsa can differ from the 74103 normal.