Goodwin, SD 57238 Frost Dates
57238, near Goodwin, SD: the frost window
The last spring frost here typically falls around 05/03, about 248 days from today. Fall's first freeze usually shows up around 10/04, roughly 153 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 Goodwin, not a forecast for this year.
Stretching the season past the first frost
Goodwin's growing season runs out in roughly 5 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
05/03 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/20 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.
Goodwin against the rest of the dataset
At roughly 153 frost-free days, Goodwin places 34,649 of 40,283 ZIP codes in this dataset. Within SD, it ranks 126 of 378.
Learn more
Two guides worth reading on 57238: the frost range, on how to read the range around Goodwin's dates instead of trusting one, and local microclimates, on what one yard in Goodwin can differ from the 57238 normal.