Coolidge, AZ 85191 Frost Dates
85191, near Coolidge, AZ: the frost window
Around 01/30 is the usual last spring frost, about 155 days away. Fall's first freeze usually shows up around 12/12, roughly 319 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 Coolidge, not a forecast for this year.
Stretching the season past the first frost
Coolidge's growing season runs out in roughly 15 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 01/30 isn't a guarantee
01/30 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/24 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 12/27 and only about 1 year in 10 sees frost after that.
Coolidge against the rest of the dataset
At roughly 319 frost-free days, Coolidge places 3,319 of 40,283 ZIP codes in this dataset. Within AZ, it ranks 202 of 506.
Learn more
Two guides worth reading on 85191: the frost range, on how to read the range around Coolidge's dates instead of trusting one, and local microclimates, on what one yard in Coolidge can differ from the 85191 normal.