South Tucson, AZ 85746 Frost Dates
South Tucson, AZ: when does the frost end?
Around 02/05 is the usual last spring frost, about 161 days away. Fall's first freeze usually shows up around 12/09, roughly 307 days after the last spring frost.
South 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.
Stretching the season past the first frost
With roughly 15 weeks until South Tucson's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around South Tucson's last frost
02/05 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 01/04 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 03/02 and only about 1 year in 10 sees frost after that.
South Tucson against the rest of the dataset
At roughly 307 frost-free days, South Tucson places 3,678 of 40,283 ZIP codes in this dataset. Within AZ, it ranks 239 of 506.
Learn more
Before leaning on 85746's figures: zone vs. frost date explains why Zone 9a and South Tucson's frost date answer different questions, while the frost range explains how to read the range around South Tucson's dates instead of trusting one.