McIntosh, SD 57659 Frost Dates
Frost dates for McIntosh, SD, ZIP 57659
Typically, the last spring freeze lands around 05/09, roughly 254 days out. The first fall frost typically arrives around 09/30, about 143 frost-free days later.
McIntosh sits in USDA Zone 4b (-25 to -20°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
What to do before the first frost
Zone 4b around McIntosh 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 McIntosh's last frost
05/09 is the middle of 30 years of NOAA records, not a promise. Plant by 04/28 and you're betting against frost in roughly 9 years out of 10. 05/24 is the safer bet, historically only a 1-in-10 chance of frost that late.
How McIntosh compares
McIntosh's growing season runs about 143 days, ranking 36,663 of 40,283 US ZIP codes measured here, longest to shortest. Within SD, it ranks 275 of 378.
Learn more
the frost range explains how to read the range around McIntosh's dates instead of trusting one, and local microclimates explains what one yard in McIntosh can differ from the 57659 normal.