Tulsa, OK 74115 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.
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.
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.
The actual range around Tulsa's last frost
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
About 220 days separate Tulsa's last and first frost, putting it 12,664 of 40,283 ZIP codes nationally. Within OK, it ranks 149 of 764.
Learn more
Before leaning on 74115's figures: zone vs. frost date explains why Zone 7b and Tulsa's frost date answer different questions, while the frost range explains how to read the range around Tulsa's dates instead of trusting one.