Mammoth Lakes, CA 93623 Frost Dates
93623, near Mammoth Lakes, CA: the frost window
The last spring frost here typically falls around 05/12, about 257 days from today. Fall's first freeze usually shows up around 11/01, roughly 171 days after the last spring frost.
Zone 8a (10 to 15°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Mammoth Lakes, not a forecast for this year.
Stretching the season past the first frost
Mammoth Lakes's growing season runs out in roughly 9 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
05/12 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/18 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/04 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 171 days, ranking 28,617 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 2,378 of 2,555.
Learn more
Two guides worth reading on 93623: 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 93623 normal.