Star Valley, AZ 85931 Frost Dates
Star Valley, AZ: when does the frost end?
The last spring frost here typically falls around 05/23, about 268 days from today. Fall's first freeze usually shows up around 10/05, roughly 135 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Star Valley in Zone 6b (-5 to 0°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
With roughly 5 weeks until Star Valley's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Star Valley's last frost
05/23 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/06 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/06 and only about 1 year in 10 sees frost after that.
Star Valley against the rest of the dataset
About 135 days separate Star Valley's last and first frost, putting it 37,870 of 40,283 ZIP codes nationally. Within AZ, it ranks 490 of 506.
Learn more
Before leaning on 85931's figures: the frost range explains how to read the range around Star Valley's dates instead of trusting one, while local microclimates explains what one yard in Star Valley can differ from the 85931 normal.