McIntosh, SD 57641 Frost Dates
McIntosh, SD: when does the frost end?
Typically, the last spring freeze lands around 05/09, roughly 254 days out. Fall's first freeze usually shows up around 09/30, roughly 143 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts McIntosh in Zone 4b (-25 to -20°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
With roughly 5 weeks until McIntosh's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around McIntosh's last frost
05/09 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/28 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/24 and only about 1 year in 10 sees frost after that.
McIntosh against the rest of the dataset
About 143 days separate McIntosh's last and first frost, putting it 36,662 of 40,283 ZIP codes nationally. Within SD, it ranks 274 of 378.
Learn more
Before leaning on 57641's figures: the frost range explains how to read the range around McIntosh's dates instead of trusting one, while local microclimates explains what one yard in McIntosh can differ from the 57641 normal.