St. Clair, MN 56080 Frost Dates
56080, near St. Clair, MN: the frost window
Typically, the last spring freeze lands around 04/30, roughly 245 days out. Fall's first freeze usually shows up around 10/09, roughly 161 days after the last spring frost.
St. Clair 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
St. Clair's growing season runs out in roughly 6 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
04/30 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/16 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/12 and only about 1 year in 10 sees frost after that.
St. Clair against the rest of the dataset
About 161 days separate St. Clair's last and first frost, putting it 32,119 of 40,283 ZIP codes nationally. Within MN, it ranks 205 of 943.
Learn more
Two guides worth reading on 56080: the frost range, on how to read the range around St. Clair's dates instead of trusting one, and local microclimates, on what one yard in St. Clair can differ from the 56080 normal.