Bruno, MN 55712 Frost Dates
55712, near Bruno, MN: the frost window
The last spring frost here typically falls around 05/18, about 263 days from today. Fall's first freeze usually shows up around 09/26, roughly 129 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Bruno in Zone 4a (-30 to -25°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
Bruno'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.
Bruno against the rest of the dataset
About 129 days separate Bruno's last and first frost, putting it 38,517 of 40,283 ZIP codes nationally. Within MN, it ranks 871 of 943.
Learn more
Two guides worth reading on 55712: zone vs. frost date, on why Zone 4a and Bruno's frost date answer different questions, and the frost range, on how to read the range around Bruno's dates instead of trusting one.