Willcox, AZ 85644 Frost Dates
Frost dates for Willcox, AZ, ZIP 85644
Typically, the last spring freeze lands around 04/09, roughly 224 days out. The first fall frost typically arrives around 10/31, about 204 frost-free days later.
The USDA Plant Hardiness Zone Map puts Willcox in Zone 8a (10 to 15°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 8a around Willcox 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.
Why 04/09 isn't a guarantee
04/09 is the middle of 30 years of NOAA records, not a promise. Plant by 03/20 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 Willcox compares
At roughly 204 frost-free days, Willcox places 16,602 of 40,283 ZIP codes in this dataset. Within AZ, it ranks 380 of 506.
Learn more
the frost range explains how to read the range around Willcox's dates instead of trusting one, and local microclimates explains what one yard in Willcox can differ from the 85644 normal.