Hitterdal, MN 56552 Frost Dates
56552, near Hitterdal, MN: the frost window
Around 05/15 is the usual last spring frost, about 260 days away. Fall's first freeze usually shows up around 09/24, roughly 130 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Hitterdal in Zone 4a (-30 to -25°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
Hitterdal'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 05/15 isn't a guarantee
05/15 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/02 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/30 and only about 1 year in 10 sees frost after that.
Hitterdal against the rest of the dataset
At roughly 130 frost-free days, Hitterdal places 38,412 of 40,283 ZIP codes in this dataset. Within MN, it ranks 856 of 943.
Learn more
Two guides worth reading on 56552: local microclimates, on what one yard in Hitterdal can differ from the 56552 normal, and zone vs. frost date, on why Zone 4a and Hitterdal's frost date answer different questions.