Susanville, CA 89557 Frost Dates
Frost dates for Susanville, CA, ZIP 89557
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.
The USDA Plant Hardiness Zone Map puts Susanville in Zone 7a (0 to 5°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 7a around Susanville has about 7 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.
The actual range around Susanville's last frost
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
About 169 days separate Susanville's last and first frost, putting it 29,364 of 40,283 ZIP codes nationally. Within CA, it ranks 2,386 of 2,555.
Learn more
the frost range explains how to read the range around Susanville's dates instead of trusting one, and local microclimates explains what one yard in Susanville can differ from the 89557 normal.