Winner, SD 57580 Frost Dates
Winner, SD: when does the frost end?
The last spring frost here typically falls around 05/01, about 246 days from today. Fall's first freeze usually shows up around 10/10, roughly 162 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Winner in Zone 5a (-20 to -15°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 6 weeks until Winner's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Winner's last frost
05/01 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/16 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/15 and only about 1 year in 10 sees frost after that.
Winner against the rest of the dataset
Winner's growing season runs about 162 days, ranking 31,740 of 40,283 US ZIP codes measured here, longest to shortest. Within SD, it ranks 24 of 378.
Learn more
Before leaning on 57580's figures: zone vs. frost date explains why Zone 5a and Winner's frost date answer different questions, while the frost range explains how to read the range around Winner's dates instead of trusting one.