Roslyn, SD 57261 Frost Dates
Roslyn, SD: when does the frost end?
The last spring frost here typically falls around 05/02, about 247 days from today. Fall's first freeze usually shows up around 10/09, roughly 160 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Roslyn 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 6 weeks until Roslyn's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
05/02 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/19 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.
Roslyn against the rest of the dataset
At roughly 160 frost-free days, Roslyn places 32,531 of 40,283 ZIP codes in this dataset. Within SD, it ranks 31 of 378.
Learn more
Before leaning on 57261's figures: zone vs. frost date explains why Zone 4b and Roslyn's frost date answer different questions, while the frost range explains how to read the range around Roslyn's dates instead of trusting one.