Colman, SD 57017 Frost Dates
Colman, 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 10/05, roughly 156 days after the last spring frost.
Zone 4b (-25 to -20°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Colman, not a forecast for this year.
Stretching the season past the first frost
With roughly 5 weeks until Colman'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 04/18 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/14 and only about 1 year in 10 sees frost after that.
Colman against the rest of the dataset
At roughly 156 frost-free days, Colman places 33,763 of 40,283 ZIP codes in this dataset. Within SD, it ranks 84 of 378.
Learn more
Before leaning on 57017's figures: the frost range explains how to read the range around Colman's dates instead of trusting one, while local microclimates explains what one yard in Colman can differ from the 57017 normal.