Hazel, SD 57242 Frost Dates
Hazel, SD: when does the frost end?
Typically, the last spring freeze lands around 05/03, roughly 248 days out. 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 Hazel, not a forecast for this year.
Stretching the season past the first frost
With roughly 5 weeks until Hazel's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Hazel's last frost
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.
Hazel against the rest of the dataset
About 153 days separate Hazel's last and first frost, putting it 34,656 of 40,283 ZIP codes nationally. Within SD, it ranks 128 of 378.
Learn more
Before leaning on 57242's figures: local microclimates explains what one yard in Hazel can differ from the 57242 normal, while zone vs. frost date explains why Zone 4b and Hazel's frost date answer different questions.