Lake Bronson, MN 56734 Frost Dates
56734, near Lake Bronson, MN: the frost window
Around 05/08 is the usual last spring frost, about 253 days away. Fall's first freeze usually shows up around 09/30, roughly 142 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 Lake Bronson, not a forecast for this year.
Stretching the season past the first frost
Lake Bronson'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.
The actual range around Lake Bronson's last frost
05/08 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/25 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/24 and only about 1 year in 10 sees frost after that.
Lake Bronson against the rest of the dataset
At roughly 142 frost-free days, Lake Bronson places 36,834 of 40,283 ZIP codes in this dataset. Within MN, it ranks 701 of 943.
Learn more
Two guides worth reading on 56734: zone vs. frost date, on why Zone 3b and Lake Bronson's frost date answer different questions, and the frost range, on how to read the range around Lake Bronson's dates instead of trusting one.