Duncan, OK 73012 Frost Dates
When can you plant in Duncan, OK?
The last spring frost here typically falls around 03/28, about 212 days from today. The first fall frost typically arrives around 11/07, about 227 frost-free days later.
The USDA Plant Hardiness Zone Map puts Duncan 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 Duncan before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Duncan's last frost
03/28 is the middle of 30 years of NOAA records, not a promise. Plant by 03/06 and you're betting against frost in roughly 9 years out of 10. 04/18 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Duncan compares
Duncan's growing season runs about 227 days, ranking 10,962 of 40,283 US ZIP codes measured here, longest to shortest. Within OK, it ranks 66 of 764.
Learn more
zone vs. frost date covers why Zone 7b and Duncan's frost date answer different questions. the frost range covers how to read the range around Duncan's dates instead of trusting one.