White River, SD 57579 Frost Dates
Frost dates for White River, SD, ZIP 57579
The last spring frost here typically falls around 05/06, about 251 days from today. The first fall frost typically arrives around 10/04, about 151 frost-free days later.
The USDA Plant Hardiness Zone Map puts White River in Zone 5a (-20 to -15°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 5a around White River 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.
Why 05/06 isn't a guarantee
05/06 is the middle of 30 years of NOAA records, not a promise. Plant by 04/24 and you're betting against frost in roughly 9 years out of 10. 05/22 is the safer bet, historically only a 1-in-10 chance of frost that late.
How White River compares
About 151 days separate White River's last and first frost, putting it 35,132 of 40,283 ZIP codes nationally. Within SD, it ranks 154 of 378.
Learn more
zone vs. frost date explains why Zone 5a and White River's frost date answer different questions, and the frost range explains how to read the range around White River's dates instead of trusting one.