Dewey-Humboldt, AZ 86329 Frost Dates
86329, near Dewey-Humboldt, AZ: the frost window
The last spring frost here typically falls around 04/30, about 245 days from today. Fall's first freeze usually shows up around 10/20, roughly 172 days after the last spring frost.
Zone 8a (10 to 15°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 Dewey-Humboldt, not a forecast for this year.
Stretching the season past the first frost
Dewey-Humboldt's growing season runs out in roughly 8 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Dewey-Humboldt's last frost
04/30 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/14 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/15 and only about 1 year in 10 sees frost after that.
Dewey-Humboldt against the rest of the dataset
At roughly 172 frost-free days, Dewey-Humboldt places 28,278 of 40,283 ZIP codes in this dataset. Within AZ, it ranks 444 of 506.
Learn more
Two guides worth reading on 86329: the frost range, on how to read the range around Dewey-Humboldt's dates instead of trusting one, and local microclimates, on what one yard in Dewey-Humboldt can differ from the 86329 normal.