Star Valley, AZ 85554 Frost Dates
When can you plant in Star Valley, AZ?
Typically, the last spring freeze lands around 05/06, roughly 251 days out. The first fall frost typically arrives around 10/20, about 165 frost-free days later.
The USDA Plant Hardiness Zone Map puts Star Valley in Zone 8a (10 to 15°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
About 8 weeks of growing season left in Star Valley before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 05/06 isn't a guarantee
05/06 is the middle of 30 years of NOAA records, not a promise. Plant by 04/20 and you're betting against frost in roughly 9 years out of 10. 05/28 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Star Valley compares
At roughly 165 frost-free days, Star Valley places 30,595 of 40,283 ZIP codes in this dataset. Within AZ, it ranks 445 of 506.
Learn more
zone vs. frost date covers why Zone 8a and Star Valley's frost date answer different questions. the frost range covers how to read the range around Star Valley's dates instead of trusting one.