Buffalo, SD 57776 Frost Dates
Frost dates for Buffalo, SD, ZIP 57776
Around 05/10 is the usual last spring frost, about 255 days away. The first fall frost typically arrives around 10/01, about 141 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 Buffalo, not a forecast for this year.
What to do before the first frost
Zone 4b around Buffalo 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 Buffalo's last frost
05/10 is the middle of 30 years of NOAA records, not a promise. Plant by 04/30 and you're betting against frost in roughly 9 years out of 10. 05/23 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Buffalo compares
Buffalo's growing season runs about 141 days, ranking 36,983 of 40,283 US ZIP codes measured here, longest to shortest. Within SD, it ranks 302 of 378.
Learn more
zone vs. frost date explains why Zone 4b and Buffalo's frost date answer different questions, and the frost range explains how to read the range around Buffalo's dates instead of trusting one.