Long Lake, SD 57457 Frost Dates
Long Lake, SD: when does the frost end?
Typically, the last spring freeze lands around 05/10, roughly 255 days out. Fall's first freeze usually shows up around 09/30, roughly 143 days after the last spring frost.
Long Lake 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.
Stretching the season past the first frost
With roughly 5 weeks until Long Lake's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Long Lake's last frost
05/10 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 05/22 and only about 1 year in 10 sees frost after that.
Long Lake against the rest of the dataset
About 143 days separate Long Lake's last and first frost, putting it 36,688 of 40,283 ZIP codes nationally. Within SD, it ranks 284 of 378.
Learn more
Before leaning on 57457's figures: the frost range explains how to read the range around Long Lake's dates instead of trusting one, while local microclimates explains what one yard in Long Lake can differ from the 57457 normal.