Susanville, CA 89435 Frost Dates
89435, near Susanville, CA: the frost window
Around 04/28 is the usual last spring frost, about 243 days away. Fall's first freeze usually shows up around 10/15, roughly 169 days after the last spring frost.
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.
Stretching the season past the first frost
Susanville's growing season runs out in roughly 7 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Susanville's last frost
04/28 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/12 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/15 and only about 1 year in 10 sees frost after that.
Susanville against the rest of the dataset
About 169 days separate Susanville's last and first frost, putting it 29,360 of 40,283 ZIP codes nationally. Within CA, it ranks 2,382 of 2,555.
Learn more
Two guides worth reading on 89435: zone vs. frost date, on why Zone 7a and Susanville's frost date answer different questions, and the frost range, on how to read the range around Susanville's dates instead of trusting one.