Sierra Vista, AZ 85615 Frost Dates
Frost dates for Sierra Vista, AZ, ZIP 85615
Around 04/07 is the usual last spring frost, about 222 days away. The first fall frost typically arrives around 11/09, about 213 frost-free days later.
The USDA Plant Hardiness Zone Map puts Sierra Vista in Zone 8b (15 to 20°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
Zone 8b around Sierra Vista has about 10 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
Why 04/07 isn't a guarantee
04/07 is the middle of 30 years of NOAA records, not a promise. Plant by 03/19 and you're betting against frost in roughly 9 years out of 10. 04/27 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Sierra Vista compares
Sierra Vista's growing season runs about 213 days, ranking 14,442 of 40,283 US ZIP codes measured here, longest to shortest. Within AZ, it ranks 373 of 506.
Learn more
the frost range explains how to read the range around Sierra Vista's dates instead of trusting one, and local microclimates explains what one yard in Sierra Vista can differ from the 85615 normal.