Mammoth Lakes, CA 93634 Frost Dates
93634, 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.
Mammoth Lakes sits in USDA Zone 5b (-15 to -10°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.
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.
How much risk comes with planting early here
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
At roughly 129 frost-free days, Mammoth Lakes places 38,454 of 40,283 ZIP codes in this dataset. Within CA, it ranks 2,476 of 2,555.
Learn more
Two guides worth reading on 93634: the frost range, on how to read the range around Mammoth Lakes's dates instead of trusting one, and local microclimates, on what one yard in Mammoth Lakes can differ from the 93634 normal.