Tombstone, AZ 85625 Frost Dates
Frost dates for Tombstone, AZ, ZIP 85625
Typically, the last spring freeze lands around 04/14, roughly 229 days out. The first fall frost typically arrives around 11/02, about 200 frost-free days later.
Zone 8a (10 to 15°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 Tombstone, not a forecast for this year.
What to do before the first frost
Zone 8a around Tombstone has about 9 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.
The actual range around Tombstone's last frost
04/14 is the middle of 30 years of NOAA records, not a promise. Plant by 03/28 and you're betting against frost in roughly 9 years out of 10. 04/30 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Tombstone compares
At roughly 200 frost-free days, Tombstone places 17,831 of 40,283 ZIP codes in this dataset. Within AZ, it ranks 386 of 506.
Learn more
zone vs. frost date explains why Zone 8a and Tombstone's frost date answer different questions, and the frost range explains how to read the range around Tombstone's dates instead of trusting one.