Fosston, MN 56542 Frost Dates
Fosston, MN: when does the frost end?
Typically, the last spring freeze lands around 05/15, roughly 260 days out. Fall's first freeze usually shows up around 09/26, roughly 132 days after the last spring frost.
Zone 3b (-35 to -30°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Fosston, not a forecast for this year.
Stretching the season past the first frost
With roughly 4 weeks until Fosston's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Fosston's last frost
05/15 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/02 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/30 and only about 1 year in 10 sees frost after that.
Fosston against the rest of the dataset
At roughly 132 frost-free days, Fosston places 38,205 of 40,283 ZIP codes in this dataset. Within MN, it ranks 824 of 943.
Learn more
Before leaning on 56542's figures: the frost range explains how to read the range around Fosston's dates instead of trusting one, while local microclimates explains what one yard in Fosston can differ from the 56542 normal.