Tucson, AZ 85756 Frost Dates
Frost dates for Tucson, AZ, ZIP 85756
The last spring frost here typically falls around 02/05, about 161 days from today. The first fall frost typically arrives around 12/09, about 307 frost-free days later.
Tucson sits in USDA Zone 9a (20 to 25°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
What to do before the first frost
Zone 9a around Tucson has about 15 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 02/05 isn't a guarantee
02/05 is the middle of 30 years of NOAA records, not a promise. Plant by 01/04 and you're betting against frost in roughly 9 years out of 10. 03/02 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Tucson compares
At roughly 307 frost-free days, Tucson places 3,672 of 40,283 ZIP codes in this dataset. Within AZ, it ranks 237 of 506.
Learn more
local microclimates explains what one yard in Tucson can differ from the 85756 normal, and zone vs. frost date explains why Zone 9a and Tucson's frost date answer different questions.