Whitewood, SD 57793 Frost Dates
Frost dates for Whitewood, SD, ZIP 57793
Typically, the last spring freeze lands around 05/18, roughly 263 days out. The first fall frost typically arrives around 09/29, about 133 frost-free days later.
The USDA Plant Hardiness Zone Map puts Whitewood 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 Whitewood 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.
How much risk comes with planting early here
05/18 is the middle of 30 years of NOAA records, not a promise. Plant by 05/05 and you're betting against frost in roughly 9 years out of 10. 06/01 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Whitewood compares
At roughly 133 frost-free days, Whitewood places 38,081 of 40,283 ZIP codes in this dataset. Within SD, it ranks 360 of 378.
Learn more
zone vs. frost date explains why Zone 5a and Whitewood's frost date answer different questions, and the frost range explains how to read the range around Whitewood's dates instead of trusting one.