Jerome, AZ 86331 Frost Dates
Frost dates for Jerome, AZ, ZIP 86331
Around 03/26 is the usual last spring frost, about 210 days away. The first fall frost typically arrives around 11/25, about 242 frost-free days later.
Jerome 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.
What to do before the first frost
Zone 8b around Jerome has about 13 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 Jerome's last frost
03/26 is the middle of 30 years of NOAA records, not a promise. Plant by 02/28 and you're betting against frost in roughly 9 years out of 10. 04/19 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Jerome compares
About 242 days separate Jerome's last and first frost, putting it 8,399 of 40,283 ZIP codes nationally. Within AZ, it ranks 326 of 506.
Learn more
zone vs. frost date explains why Zone 8b and Jerome's frost date answer different questions, and the frost range explains how to read the range around Jerome's dates instead of trusting one.