Chamberlain, SD 57325 Frost Dates
Chamberlain, SD: when does the frost end?
Typically, the last spring freeze lands around 05/01, roughly 246 days out. Fall's first freeze usually shows up around 10/07, roughly 158 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Chamberlain in Zone 5a (-20 to -15°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 Chamberlain's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Chamberlain's last frost
05/01 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.
Chamberlain against the rest of the dataset
About 158 days separate Chamberlain's last and first frost, putting it 32,991 of 40,283 ZIP codes nationally. Within SD, it ranks 47 of 378.
Learn more
Before leaning on 57325's figures: local microclimates explains what one yard in Chamberlain can differ from the 57325 normal, while zone vs. frost date explains why Zone 5a and Chamberlain's frost date answer different questions.