St. Martin, MN 56376 Frost Dates
56376, near St. Martin, MN: the frost window
Around 05/04 is the usual last spring frost, about 249 days away. Fall's first freeze usually shows up around 10/01, roughly 148 days after the last spring frost.
St. Martin 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
St. Martin'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.
Why 05/04 isn't a guarantee
05/04 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/22 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/19 and only about 1 year in 10 sees frost after that.
St. Martin against the rest of the dataset
About 148 days separate St. Martin's last and first frost, putting it 35,796 of 40,283 ZIP codes nationally. Within MN, it ranks 597 of 943.
Learn more
Two guides worth reading on 56376: the frost range, on how to read the range around St. Martin's dates instead of trusting one, and local microclimates, on what one yard in St. Martin can differ from the 56376 normal.