Wagner, SD 57380 Frost Dates
Frost dates for Wagner, SD, ZIP 57380
Around 04/29 is the usual last spring frost, about 244 days away. The first fall frost typically arrives around 10/09, about 164 frost-free days later.
The USDA Plant Hardiness Zone Map puts Wagner 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 Wagner has about 6 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 04/29 isn't a guarantee
04/29 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. 05/12 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Wagner compares
About 164 days separate Wagner's last and first frost, putting it 31,024 of 40,283 ZIP codes nationally. Within SD, it ranks 12 of 378.
Learn more
local microclimates explains what one yard in Wagner can differ from the 57380 normal, and zone vs. frost date explains why Zone 5a and Wagner's frost date answer different questions.