Hendrum, MN 56550 Frost Dates
56550, near Hendrum, MN: the frost window
Typically, the last spring freeze lands around 05/11, roughly 256 days out. Fall's first freeze usually shows up around 09/27, roughly 137 days after the last spring frost.
Hendrum sits in USDA Zone 4a (-30 to -25°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
Stretching the season past the first frost
Hendrum'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.
The actual range around Hendrum's last frost
05/11 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/30 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/25 and only about 1 year in 10 sees frost after that.
Hendrum against the rest of the dataset
Hendrum's growing season runs about 137 days, ranking 37,583 of 40,283 US ZIP codes measured here, longest to shortest. Within MN, it ranks 788 of 943.
Learn more
Two guides worth reading on 56550: the frost range, on how to read the range around Hendrum's dates instead of trusting one, and local microclimates, on what one yard in Hendrum can differ from the 56550 normal.