Wall, SD 57790 Frost Dates
57790, near Wall, SD: the frost window
Typically, the last spring freeze lands around 05/11, roughly 256 days out. Fall's first freeze usually shows up around 09/30, roughly 141 days after the last spring frost.
Wall sits in USDA Zone 5a (-20 to -15°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
Wall's growing season runs out in roughly 5 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Wall's last frost
05/11 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/29 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/24 and only about 1 year in 10 sees frost after that.
Wall against the rest of the dataset
About 141 days separate Wall's last and first frost, putting it 36,955 of 40,283 ZIP codes nationally. Within SD, it ranks 294 of 378.
Learn more
Two guides worth reading on 57790: zone vs. frost date, on why Zone 5a and Wall's frost date answer different questions, and the frost range, on how to read the range around Wall's dates instead of trusting one.