Quartzsite, AZ 85357 Frost Dates
85357, near Quartzsite, AZ: the frost window
Typically, the last spring freeze lands around 03/17, roughly 201 days out. Fall's first freeze usually shows up around 11/19, roughly 243 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 Quartzsite, not a forecast for this year.
Stretching the season past the first frost
Quartzsite's growing season runs out in roughly 12 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 Quartzsite's last frost
03/17 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/18 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/12 and only about 1 year in 10 sees frost after that.
Quartzsite against the rest of the dataset
Quartzsite's growing season runs about 243 days, ranking 8,303 of 40,283 US ZIP codes measured here, longest to shortest. Within AZ, it ranks 324 of 506.
Learn more
Two guides worth reading on 85357: the frost range, on how to read the range around Quartzsite's dates instead of trusting one, and local microclimates, on what one yard in Quartzsite can differ from the 85357 normal.