Milroy, MN 56263 Frost Dates
56263, near Milroy, MN: the frost window
Typically, the last spring freeze lands around 05/05, roughly 250 days out. Fall's first freeze usually shows up around 10/03, roughly 150 days after the last spring frost.
Milroy sits in USDA Zone 5a (-20 to -15°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
Milroy'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 Milroy's last frost
05/05 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/21 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/18 and only about 1 year in 10 sees frost after that.
Milroy against the rest of the dataset
Milroy's growing season runs about 150 days, ranking 35,418 of 40,283 US ZIP codes measured here, longest to shortest. Within MN, it ranks 543 of 943.
Learn more
Two guides worth reading on 56263: zone vs. frost date, on why Zone 5a and Milroy's frost date answer different questions, and the frost range, on how to read the range around Milroy's dates instead of trusting one.