Susanville, CA 96117 Frost Dates
Frost dates for Susanville, CA, ZIP 96117
Around 05/21 is the usual last spring frost, about 266 days away. The first fall frost typically arrives around 10/01, about 130 frost-free days later.
Susanville sits in USDA Zone 6b (-5 to 0°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
Zone 6b around Susanville has about 5 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
05/21 is the middle of 30 years of NOAA records, not a promise. Plant by 04/30 and you're betting against frost in roughly 9 years out of 10. 06/11 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Susanville compares
About 130 days separate Susanville's last and first frost, putting it 38,361 of 40,283 ZIP codes nationally. Within CA, it ranks 2,466 of 2,555.
Learn more
zone vs. frost date explains why Zone 6b and Susanville's frost date answer different questions, and the frost range explains how to read the range around Susanville's dates instead of trusting one.