Sahuarita, AZ 85629 Frost Dates
Sahuarita, AZ: when does the frost end?
Typically, the last spring freeze lands around 02/25, roughly 181 days out. Fall's first freeze usually shows up around 11/27, roughly 276 days after the last spring frost.
Zone 9a (20 to 25°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Sahuarita, not a forecast for this year.
Stretching the season past the first frost
With roughly 13 weeks until Sahuarita's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 02/25 isn't a guarantee
02/25 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 01/31 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 03/18 and only about 1 year in 10 sees frost after that.
Sahuarita against the rest of the dataset
About 276 days separate Sahuarita's last and first frost, putting it 5,048 of 40,283 ZIP codes nationally. Within AZ, it ranks 303 of 506.
Learn more
Before leaning on 85629's figures: zone vs. frost date explains why Zone 9a and Sahuarita's frost date answer different questions, while the frost range explains how to read the range around Sahuarita's dates instead of trusting one.