Iona, MN 56141 Frost Dates
Iona, MN: when does the frost end?
Typically, the last spring freeze lands around 05/07, roughly 252 days out. Fall's first freeze usually shows up around 09/29, roughly 145 days after the last spring frost.
Iona 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
With roughly 5 weeks until Iona's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Iona's last frost
05/07 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/25 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/19 and only about 1 year in 10 sees frost after that.
Iona against the rest of the dataset
At roughly 145 frost-free days, Iona places 36,298 of 40,283 ZIP codes in this dataset. Within MN, it ranks 639 of 943.
Learn more
Before leaning on 56141's figures: zone vs. frost date explains why Zone 5a and Iona's frost date answer different questions, while the frost range explains how to read the range around Iona's dates instead of trusting one.