Canton, MN 55922 Frost Dates
55922, near Canton, MN: the frost window
Around 05/10 is the usual last spring frost, about 255 days away. Fall's first freeze usually shows up around 09/28, roughly 140 days after the last spring frost.
Zone 4b (-25 to -20°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Canton, not a forecast for this year.
Stretching the season past the first frost
Canton'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 05/10 isn't a guarantee
05/10 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/27 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/23 and only about 1 year in 10 sees frost after that.
Canton against the rest of the dataset
Canton's growing season runs about 140 days, ranking 37,152 of 40,283 US ZIP codes measured here, longest to shortest. Within MN, it ranks 748 of 943.
Learn more
Two guides worth reading on 55922: the frost range, on how to read the range around Canton's dates instead of trusting one, and local microclimates, on what one yard in Canton can differ from the 55922 normal.