Star Valley, AZ 86024 Frost Dates
86024, near Star Valley, AZ: the frost window
Typically, the last spring freeze lands around 05/31, roughly 276 days out. Fall's first freeze usually shows up around 10/02, roughly 126 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Star Valley in Zone 7a (0 to 5°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
Star Valley's growing season runs out in roughly 5 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 05/31 isn't a guarantee
05/31 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/13 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/12 and only about 1 year in 10 sees frost after that.
Star Valley against the rest of the dataset
At roughly 126 frost-free days, Star Valley places 38,684 of 40,283 ZIP codes in this dataset. Within AZ, it ranks 491 of 506.
Learn more
Two guides worth reading on 86024: the frost range, on how to read the range around Star Valley's dates instead of trusting one, and local microclimates, on what one yard in Star Valley can differ from the 86024 normal.