Auburn, CA 95603 Frost Dates
Frost dates for Auburn, CA, ZIP 95603
Around 04/03 is the usual last spring frost, about 218 days away. The first fall frost typically arrives around 11/24, about 233 frost-free days later.
The USDA Plant Hardiness Zone Map puts Auburn in Zone 9b (25 to 30°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
Zone 9b around Auburn has about 13 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
How much risk comes with planting early here
04/03 is the middle of 30 years of NOAA records, not a promise. Plant by 02/28 and you're betting against frost in roughly 9 years out of 10. 04/29 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Auburn compares
Auburn's growing season runs about 233 days, ranking 9,865 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 2,157 of 2,555.
Learn more
the frost range explains how to read the range around Auburn's dates instead of trusting one, and local microclimates explains what one yard in Auburn can differ from the 95603 normal.