Nashwauk, MN 55769 Frost Dates
55769, near Nashwauk, MN: the frost window
Around 06/05 is the usual last spring frost, about 281 days away. Fall's first freeze usually shows up around 09/08, roughly 93 days after the last spring frost.
Zone 3b (-35 to -30°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 Nashwauk, not a forecast for this year.
Stretching the season past the first frost
Nashwauk's growing season runs out in roughly 2 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 06/05 isn't a guarantee
06/05 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/22 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/25 and only about 1 year in 10 sees frost after that.
Nashwauk against the rest of the dataset
About 93 days separate Nashwauk's last and first frost, putting it 39,871 of 40,283 ZIP codes nationally. Within MN, it ranks 928 of 943.
Learn more
Two guides worth reading on 55769: the frost range, on how to read the range around Nashwauk's dates instead of trusting one, and local microclimates, on what one yard in Nashwauk can differ from the 55769 normal.