Susanville, CA 89599 Frost Dates
When can you plant in Susanville, CA?
Around 04/28 is the usual last spring frost, about 243 days away. The first fall frost typically arrives around 10/15, about 169 frost-free days later.
Zone 7a (0 to 5°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 Susanville, not a forecast for this year.
What to do before the first frost
About 7 weeks of growing season left in Susanville before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 04/28 isn't a guarantee
04/28 is the middle of 30 years of NOAA records, not a promise. Plant by 04/12 and you're betting against frost in roughly 9 years out of 10. 05/15 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Susanville compares
Susanville's growing season runs about 169 days, ranking 29,367 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 2,389 of 2,555.
Learn more
zone vs. frost date covers why Zone 7a and Susanville's frost date answer different questions. the frost range covers how to read the range around Susanville's dates instead of trusting one.