Mammoth, AZ 85631 Frost Dates
Mammoth, AZ: when does the frost end?
Around 02/04 is the usual last spring frost, about 160 days away. Fall's first freeze usually shows up around 12/08, roughly 306 days after the last spring frost.
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.
Stretching the season past the first frost
With roughly 15 weeks until Mammoth's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Mammoth's last frost
02/04 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 01/05 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 03/02 and only about 1 year in 10 sees frost after that.
Mammoth against the rest of the dataset
About 306 days separate Mammoth's last and first frost, putting it 3,716 of 40,283 ZIP codes nationally. Within AZ, it ranks 243 of 506.
Learn more
Before leaning on 85631's figures: zone vs. frost date explains why Zone 9a and Mammoth's frost date answer different questions, while the frost range explains how to read the range around Mammoth's dates instead of trusting one.