Redfield, SD 57469 Frost Dates
Redfield, SD: when does the frost end?
The last spring frost here typically falls around 05/08, about 253 days from today. Fall's first freeze usually shows up around 10/01, roughly 145 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Redfield in Zone 4b (-25 to -20°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 5 weeks until Redfield'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
05/08 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/25 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.
Redfield against the rest of the dataset
Redfield's growing season runs about 145 days, ranking 36,209 of 40,283 US ZIP codes measured here, longest to shortest. Within SD, it ranks 232 of 378.
Learn more
Before leaning on 57469's figures: the frost range explains how to read the range around Redfield's dates instead of trusting one, while local microclimates explains what one yard in Redfield can differ from the 57469 normal.