Douglas, AZ 85610 Frost Dates
Frost dates for Douglas, AZ, ZIP 85610
Around 04/06 is the usual last spring frost, about 221 days away. The first fall frost typically arrives around 11/10, about 215 frost-free days later.
The USDA Plant Hardiness Zone Map puts Douglas in Zone 8b (15 to 20°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
Zone 8b around Douglas has about 11 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 04/06 isn't a guarantee
04/06 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. 04/24 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Douglas compares
Douglas's growing season runs about 215 days, ranking 14,044 of 40,283 US ZIP codes measured here, longest to shortest. Within AZ, it ranks 371 of 506.
Learn more
local microclimates explains what one yard in Douglas can differ from the 85610 normal, and zone vs. frost date explains why Zone 8b and Douglas's frost date answer different questions.