Dewey-Humboldt, AZ 86327 Frost Dates
Dewey-Humboldt, AZ: when does the frost end?
Around 04/30 is the usual last spring frost, about 245 days away. 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
With roughly 8 weeks until Dewey-Humboldt's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
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
About 172 days separate Dewey-Humboldt's last and first frost, putting it 28,277 of 40,283 ZIP codes nationally. Within AZ, it ranks 443 of 506.
Learn more
Before leaning on 86327's figures: local microclimates explains what one yard in Dewey-Humboldt can differ from the 86327 normal, while zone vs. frost date explains why Zone 8a and Dewey-Humboldt's frost date answer different questions.