Audubon, MN 56511 Frost Dates
56511, near Audubon, MN: the frost window
The last spring frost here typically falls around 05/15, about 260 days from today. Fall's first freeze usually shows up around 09/24, roughly 130 days after the last spring frost.
Zone 4a (-30 to -25°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 Audubon, not a forecast for this year.
Stretching the season past the first frost
Audubon'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.
The actual range around Audubon's last frost
05/15 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/02 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/30 and only about 1 year in 10 sees frost after that.
Audubon against the rest of the dataset
At roughly 130 frost-free days, Audubon places 38,405 of 40,283 ZIP codes in this dataset. Within MN, it ranks 852 of 943.
Learn more
Two guides worth reading on 56511: zone vs. frost date, on why Zone 4a and Audubon's frost date answer different questions, and the frost range, on how to read the range around Audubon's dates instead of trusting one.