Wasta, SD 57791 Frost Dates
Frost dates for Wasta, SD, ZIP 57791
Around 05/12 is the usual last spring frost, about 257 days away. The first fall frost typically arrives around 10/01, about 139 frost-free days later.
Zone 4b (-25 to -20°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 Wasta, not a forecast for this year.
What to do before the first frost
Zone 4b around Wasta 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 Wasta's last frost
05/12 is the middle of 30 years of NOAA records, not a promise. Plant by 05/01 and you're betting against frost in roughly 9 years out of 10. 05/26 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Wasta compares
About 139 days separate Wasta's last and first frost, putting it 37,313 of 40,283 ZIP codes nationally. Within SD, it ranks 329 of 378.
Learn more
zone vs. frost date explains why Zone 4b and Wasta's frost date answer different questions, and the frost range explains how to read the range around Wasta's dates instead of trusting one.