Hibbing, MN 55746 Frost Dates
55746, near Hibbing, MN: the frost window
Typically, the last spring freeze lands around 06/05, roughly 281 days out. Fall's first freeze usually shows up around 09/08, roughly 93 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 Hibbing, not a forecast for this year.
Stretching the season past the first frost
Hibbing's growing season runs out in roughly 2 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 Hibbing's last frost
06/05 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/22 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/25 and only about 1 year in 10 sees frost after that.
Hibbing against the rest of the dataset
Hibbing's growing season runs about 93 days, ranking 39,864 of 40,283 US ZIP codes measured here, longest to shortest. Within MN, it ranks 925 of 943.
Learn more
Two guides worth reading on 55746: the frost range, on how to read the range around Hibbing's dates instead of trusting one, and local microclimates, on what one yard in Hibbing can differ from the 55746 normal.