Bisbee, AZ 85603 Frost Dates
85603, near Bisbee, AZ: the frost window
The last spring frost here typically falls around 04/01, about 216 days from today. Fall's first freeze usually shows up around 11/10, roughly 222 days after the last spring frost.
Bisbee sits in USDA Zone 8b (15 to 20°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
Bisbee's growing season runs out in roughly 11 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
04/01 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/13 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/20 and only about 1 year in 10 sees frost after that.
Bisbee against the rest of the dataset
At roughly 222 frost-free days, Bisbee places 12,254 of 40,283 ZIP codes in this dataset. Within AZ, it ranks 346 of 506.
Learn more
Two guides worth reading on 85603: local microclimates, on what one yard in Bisbee can differ from the 85603 normal, and zone vs. frost date, on why Zone 8b and Bisbee's frost date answer different questions.