Douglas, OK 73733 Frost Dates
Frost dates for Douglas, OK, ZIP 73733
Around 04/11 is the usual last spring frost, about 226 days away. The first fall frost typically arrives around 10/31, about 201 frost-free days later.
Zone 7a (0 to 5°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Douglas, not a forecast for this year.
What to do before the first frost
Zone 7a around Douglas has about 9 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.
The actual range around Douglas's last frost
04/11 is the middle of 30 years of NOAA records, not a promise. Plant by 03/24 and you're betting against frost in roughly 9 years out of 10. 04/29 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Douglas compares
Douglas's growing season runs about 201 days, ranking 17,699 of 40,283 US ZIP codes measured here, longest to shortest. Within OK, it ranks 665 of 764.
Learn more
local microclimates explains what one yard in Douglas can differ from the 73733 normal, and zone vs. frost date explains why Zone 7a and Douglas's frost date answer different questions.