Oelrichs, SD 57764 Frost Dates
Oelrichs, SD: when does the frost end?
Typically, the last spring freeze lands around 05/07, roughly 252 days out. Fall's first freeze usually shows up around 10/04, roughly 149 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 Oelrichs, not a forecast for this year.
Stretching the season past the first frost
With roughly 5 weeks until Oelrichs'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
05/07 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/24 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/21 and only about 1 year in 10 sees frost after that.
Oelrichs against the rest of the dataset
Oelrichs's growing season runs about 149 days, ranking 35,593 of 40,283 US ZIP codes measured here, longest to shortest. Within SD, it ranks 190 of 378.
Learn more
Before leaning on 57764's figures: the frost range explains how to read the range around Oelrichs's dates instead of trusting one, while local microclimates explains what one yard in Oelrichs can differ from the 57764 normal.