Wrenshall, MN 55749 Frost Dates
55749, near Wrenshall, MN: the frost window
Around 05/18 is the usual last spring frost, about 263 days away. Fall's first freeze usually shows up around 09/26, roughly 129 days after the last spring frost.
Wrenshall sits in USDA Zone 4a (-30 to -25°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
Wrenshall'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 05/18 isn't a guarantee
05/18 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/03 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/01 and only about 1 year in 10 sees frost after that.
Wrenshall against the rest of the dataset
About 129 days separate Wrenshall's last and first frost, putting it 38,488 of 40,283 ZIP codes nationally. Within MN, it ranks 868 of 943.
Learn more
Two guides worth reading on 55749: the frost range, on how to read the range around Wrenshall's dates instead of trusting one, and local microclimates, on what one yard in Wrenshall can differ from the 55749 normal.