Olivet, SD 57052 Frost Dates
57052, near Olivet, SD: the frost window
The last spring frost here typically falls around 05/01, about 246 days from today. Fall's first freeze usually shows up around 10/04, roughly 156 days after the last spring frost.
Zone 5a (-20 to -15°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 Olivet, not a forecast for this year.
Stretching the season past the first frost
Olivet'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
05/01 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/17 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.
Olivet against the rest of the dataset
About 156 days separate Olivet's last and first frost, putting it 33,885 of 40,283 ZIP codes nationally. Within SD, it ranks 94 of 378.
Learn more
Two guides worth reading on 57052: zone vs. frost date, on why Zone 5a and Olivet's frost date answer different questions, and the frost range, on how to read the range around Olivet's dates instead of trusting one.