Shelly, MN 58219 Frost Dates
58219, near Shelly, MN: the frost window
Typically, the last spring freeze lands around 05/02, roughly 247 days out. Fall's first freeze usually shows up around 10/09, roughly 158 days after the last spring frost.
Shelly 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
Shelly'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.
The actual range around Shelly's last frost
05/02 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/15 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/17 and only about 1 year in 10 sees frost after that.
Shelly against the rest of the dataset
At roughly 158 frost-free days, Shelly places 33,157 of 40,283 ZIP codes in this dataset. Within MN, it ranks 299 of 943.
Learn more
Two guides worth reading on 58219: local microclimates, on what one yard in Shelly can differ from the 58219 normal, and zone vs. frost date, on why Zone 4a and Shelly's frost date answer different questions.