Norman, OK 73069 Frost Dates
When can you plant in Norman, OK?
Around 03/31 is the usual last spring frost, about 215 days away. The first fall frost typically arrives around 11/05, about 219 frost-free days later.
The USDA Plant Hardiness Zone Map puts Norman 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
About 10 weeks of growing season left in Norman before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 03/31 isn't a guarantee
03/31 is the middle of 30 years of NOAA records, not a promise. Plant by 03/12 and you're betting against frost in roughly 9 years out of 10. 04/17 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Norman compares
About 219 days separate Norman's last and first frost, putting it 12,922 of 40,283 ZIP codes nationally. Within OK, it ranks 215 of 764.
Learn more
the frost range covers how to read the range around Norman's dates instead of trusting one. local microclimates covers what one yard in Norman can differ from the 73069 normal.