Kasson, MN 55944 Frost Dates
55944, near Kasson, MN: the frost window
Typically, the last spring freeze lands around 05/12, roughly 257 days out. Fall's first freeze usually shows up around 09/28, roughly 139 days after the last spring frost.
Kasson 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
Kasson's growing season runs out in roughly 4 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 05/12 isn't a guarantee
05/12 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 05/25 and only about 1 year in 10 sees frost after that.
Kasson against the rest of the dataset
About 139 days separate Kasson's last and first frost, putting it 37,221 of 40,283 ZIP codes nationally. Within MN, it ranks 756 of 943.
Learn more
Two guides worth reading on 55944: the frost range, on how to read the range around Kasson's dates instead of trusting one, and local microclimates, on what one yard in Kasson can differ from the 55944 normal.