Twin Valley, MN 56584 Frost Dates
56584, near Twin Valley, 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.
Twin Valley 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
Twin Valley'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 Twin Valley'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.
Twin Valley against the rest of the dataset
At roughly 137 frost-free days, Twin Valley places 37,554 of 40,283 ZIP codes in this dataset. Within MN, it ranks 783 of 943.
Learn more
Two guides worth reading on 56584: zone vs. frost date, on why Zone 4a and Twin Valley's frost date answer different questions, and the frost range, on how to read the range around Twin Valley's dates instead of trusting one.