Mammoth, AZ 85618 Frost Dates
When can you plant in Mammoth, AZ?
The last spring frost here typically falls around 02/04, about 160 days from today. The first fall frost typically arrives around 12/08, about 306 frost-free days later.
The USDA Plant Hardiness Zone Map puts Mammoth in Zone 9a (20 to 25°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
About 15 weeks of growing season left in Mammoth before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Mammoth's last frost
02/04 is the middle of 30 years of NOAA records, not a promise. Plant by 01/05 and you're betting against frost in roughly 9 years out of 10. 03/02 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Mammoth compares
About 306 days separate Mammoth's last and first frost, putting it 3,715 of 40,283 ZIP codes nationally. Within AZ, it ranks 242 of 506.
Learn more
the frost range covers how to read the range around Mammoth's dates instead of trusting one. local microclimates covers what one yard in Mammoth can differ from the 85618 normal.