Bisbee, AZ 85620 Frost Dates
Frost dates for Bisbee, AZ, ZIP 85620
Typically, the last spring freeze lands around 04/01, roughly 216 days out. The first fall frost typically arrives around 11/10, about 222 frost-free days later.
The USDA Plant Hardiness Zone Map puts Bisbee in Zone 8b (15 to 20°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
Zone 8b around Bisbee has about 11 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
How much risk comes with planting early here
04/01 is the middle of 30 years of NOAA records, not a promise. Plant by 03/13 and you're betting against frost in roughly 9 years out of 10. 04/20 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Bisbee compares
Bisbee's growing season runs about 222 days, ranking 12,255 of 40,283 US ZIP codes measured here, longest to shortest. Within AZ, it ranks 347 of 506.
Learn more
zone vs. frost date explains why Zone 8b and Bisbee's frost date answer different questions, and the frost range explains how to read the range around Bisbee's dates instead of trusting one.