Pierpont, SD 57468 Frost Dates
Frost dates for Pierpont, SD, ZIP 57468
Around 05/06 is the usual last spring frost, about 251 days away. The first fall frost typically arrives around 10/04, about 150 frost-free days later.
The USDA Plant Hardiness Zone Map puts Pierpont in Zone 4b (-25 to -20°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 4b around Pierpont 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 Pierpont's last frost
05/06 is the middle of 30 years of NOAA records, not a promise. Plant by 04/22 and you're betting against frost in roughly 9 years out of 10. 05/21 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Pierpont compares
Pierpont's growing season runs about 150 days, ranking 35,451 of 40,283 US ZIP codes measured here, longest to shortest. Within SD, it ranks 174 of 378.
Learn more
the frost range explains how to read the range around Pierpont's dates instead of trusting one, and local microclimates explains what one yard in Pierpont can differ from the 57468 normal.