Marana, AZ 85658 Frost Dates
85658, near Marana, AZ: the frost window
Typically, the last spring freeze lands around 02/26, roughly 182 days out. Fall's first freeze usually shows up around 12/04, roughly 279 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Marana in Zone 9b (25 to 30°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
Marana's growing season runs out in roughly 14 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Marana's last frost
02/26 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 01/29 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.
Marana against the rest of the dataset
Marana's growing season runs about 279 days, ranking 4,860 of 40,283 US ZIP codes measured here, longest to shortest. Within AZ, it ranks 291 of 506.
Learn more
Two guides worth reading on 85658: local microclimates, on what one yard in Marana can differ from the 85658 normal, and zone vs. frost date, on why Zone 9b and Marana's frost date answer different questions.