Pierz, MN 56364 Frost Dates
56364, near Pierz, MN: the frost window
Typically, the last spring freeze lands around 05/04, roughly 249 days out. Fall's first freeze usually shows up around 10/05, roughly 151 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Pierz 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
Pierz'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.
How much risk comes with planting early here
05/04 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/21 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/22 and only about 1 year in 10 sees frost after that.
Pierz against the rest of the dataset
Pierz's growing season runs about 151 days, ranking 35,069 of 40,283 US ZIP codes measured here, longest to shortest. Within MN, it ranks 493 of 943.
Learn more
Two guides worth reading on 56364: local microclimates, on what one yard in Pierz can differ from the 56364 normal, and zone vs. frost date, on why Zone 4a and Pierz's frost date answer different questions.