Pima, AZ 85535 Frost Dates
When can you plant in Pima, AZ?
The last spring frost here typically falls around 04/01, about 216 days from today. The first fall frost typically arrives around 11/06, about 217 frost-free days later.
Pima 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
About 10 weeks of growing season left in Pima before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 04/01 isn't a guarantee
04/01 is the middle of 30 years of NOAA records, not a promise. Plant by 03/15 and you're betting against frost in roughly 9 years out of 10. 04/18 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Pima compares
At roughly 217 frost-free days, Pima places 13,486 of 40,283 ZIP codes in this dataset. Within AZ, it ranks 363 of 506.
Learn more
zone vs. frost date covers why Zone 8b and Pima's frost date answer different questions. the frost range covers how to read the range around Pima's dates instead of trusting one.