South Tucson, AZ 85712 Frost Dates
Frost dates for South Tucson, AZ, ZIP 85712
Around 02/20 is the usual last spring frost, about 176 days away. The first fall frost typically arrives around 11/27, about 280 frost-free days later.
South Tucson sits in USDA Zone 9b (25 to 30°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 9b around South Tucson has about 13 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.
The actual range around South Tucson's last frost
02/20 is the middle of 30 years of NOAA records, not a promise. Plant by 01/30 and you're betting against frost in roughly 9 years out of 10. 03/11 is the safer bet, historically only a 1-in-10 chance of frost that late.
How South Tucson compares
About 280 days separate South Tucson's last and first frost, putting it 4,833 of 40,283 ZIP codes nationally. Within AZ, it ranks 289 of 506.
Learn more
zone vs. frost date explains why Zone 9b and South Tucson's frost date answer different questions, and the frost range explains how to read the range around South Tucson's dates instead of trusting one.