Tucson, AZ 85707 Frost Dates
When can you plant in Tucson, AZ?
Typically, the last spring freeze lands around 02/05, roughly 161 days out. The first fall frost typically arrives around 12/09, about 307 frost-free days later.
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
About 15 weeks of growing season left in Tucson before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Tucson's last frost
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
About 307 days separate Tucson's last and first frost, putting it 3,670 of 40,283 ZIP codes nationally. Within AZ, it ranks 235 of 506.
Learn more
the frost range covers how to read the range around Tucson's dates instead of trusting one. local microclimates covers what one yard in Tucson can differ from the 85707 normal.