Mammoth Lakes, CA 93604 Frost Dates
When can you plant in Mammoth Lakes, CA?
Typically, the last spring freeze lands around 06/01, roughly 277 days out. The first fall frost typically arrives around 10/06, about 129 frost-free days later.
Mammoth Lakes sits in USDA Zone 8b (15 to 20°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.
What to do before the first frost
About 6 weeks of growing season left in Mammoth Lakes before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 06/01 isn't a guarantee
06/01 is the middle of 30 years of NOAA records, not a promise. Plant by 05/13 and you're betting against frost in roughly 9 years out of 10. 06/18 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Mammoth Lakes compares
At roughly 129 frost-free days, Mammoth Lakes places 38,452 of 40,283 ZIP codes in this dataset. Within CA, it ranks 2,474 of 2,555.
Learn more
the frost range covers how to read the range around Mammoth Lakes's dates instead of trusting one. local microclimates covers what one yard in Mammoth Lakes can differ from the 93604 normal.