Dewey-Humboldt, AZ 86333 Frost Dates
Frost dates for Dewey-Humboldt, AZ, ZIP 86333
The last spring frost here typically falls around 04/05, about 220 days from today. The first fall frost typically arrives around 11/17, about 221 frost-free days later.
Dewey-Humboldt sits in USDA Zone 8b (15 to 20°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
What to do before the first frost
Zone 8b around Dewey-Humboldt has about 12 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 04/05 isn't a guarantee
04/05 is the middle of 30 years of NOAA records, not a promise. Plant by 03/09 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 Dewey-Humboldt compares
At roughly 221 frost-free days, Dewey-Humboldt places 12,504 of 40,283 ZIP codes in this dataset. Within AZ, it ranks 349 of 506.
Learn more
the frost range explains how to read the range around Dewey-Humboldt's dates instead of trusting one, and local microclimates explains what one yard in Dewey-Humboldt can differ from the 86333 normal.