Ostrander, MN 55961 Frost Dates
Ostrander, MN: when does the frost end?
Typically, the last spring freeze lands around 05/06, roughly 251 days out. Fall's first freeze usually shows up around 10/01, roughly 146 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Ostrander in Zone 4b (-25 to -20°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
With roughly 5 weeks until Ostrander's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Ostrander's last frost
05/06 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/23 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.
Ostrander against the rest of the dataset
At roughly 146 frost-free days, Ostrander places 36,133 of 40,283 ZIP codes in this dataset. Within MN, it ranks 627 of 943.
Learn more
Before leaning on 55961's figures: zone vs. frost date explains why Zone 4b and Ostrander's frost date answer different questions, while the frost range explains how to read the range around Ostrander's dates instead of trusting one.