Mammoth Lakes, CA 93605 Frost Dates
93605, near Mammoth Lakes, CA: the frost window
Around 06/01 is the usual last spring frost, about 277 days away. Fall's first freeze usually shows up around 10/06, roughly 129 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Mammoth Lakes in Zone 7b (5 to 10°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
Mammoth Lakes's growing season runs out in roughly 6 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Mammoth Lakes's last frost
06/01 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/13 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/18 and only about 1 year in 10 sees frost after that.
Mammoth Lakes against the rest of the dataset
Mammoth Lakes's growing season runs about 129 days, ranking 38,453 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 2,475 of 2,555.
Learn more
Two guides worth reading on 93605: zone vs. frost date, on why Zone 7b and Mammoth Lakes's frost date answer different questions, and the frost range, on how to read the range around Mammoth Lakes's dates instead of trusting one.