Zumbrota, MN 55992 Frost Dates
55992, near Zumbrota, MN: the frost window
Around 05/09 is the usual last spring frost, about 254 days away. Fall's first freeze usually shows up around 09/30, roughly 144 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Zumbrota 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
Zumbrota'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 Zumbrota's last frost
05/09 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/24 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/22 and only about 1 year in 10 sees frost after that.
Zumbrota against the rest of the dataset
At roughly 144 frost-free days, Zumbrota places 36,364 of 40,283 ZIP codes in this dataset. Within MN, it ranks 651 of 943.
Learn more
Two guides worth reading on 55992: zone vs. frost date, on why Zone 4b and Zumbrota's frost date answer different questions, and the frost range, on how to read the range around Zumbrota's dates instead of trusting one.