Sunburg, MN 56289 Frost Dates
56289, near Sunburg, MN: the frost window
Around 05/01 is the usual last spring frost, about 246 days away. Fall's first freeze usually shows up around 10/06, roughly 156 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Sunburg in Zone 4b (-25 to -20°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
Sunburg's growing season runs out in roughly 6 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
05/01 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/19 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/12 and only about 1 year in 10 sees frost after that.
Sunburg against the rest of the dataset
At roughly 156 frost-free days, Sunburg places 33,882 of 40,283 ZIP codes in this dataset. Within MN, it ranks 343 of 943.
Learn more
Two guides worth reading on 56289: zone vs. frost date, on why Zone 4b and Sunburg's frost date answer different questions, and the frost range, on how to read the range around Sunburg's dates instead of trusting one.