Florence, SD 57235 Frost Dates
Florence, SD: when does the frost end?
Around 05/07 is the usual last spring frost, about 252 days away. Fall's first freeze usually shows up around 09/28, roughly 143 days after the last spring frost.
Florence sits in USDA Zone 4b (-25 to -20°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
Stretching the season past the first frost
With roughly 4 weeks until Florence'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 05/20 and only about 1 year in 10 sees frost after that.
Florence against the rest of the dataset
At roughly 143 frost-free days, Florence places 36,616 of 40,283 ZIP codes in this dataset. Within SD, it ranks 271 of 378.
Learn more
Before leaning on 57235's figures: zone vs. frost date explains why Zone 4b and Florence's frost date answer different questions, while the frost range explains how to read the range around Florence's dates instead of trusting one.