Alden, MN 56009 Frost Dates
Alden, MN: when does the frost end?
Around 04/30 is the usual last spring frost, about 245 days away. Fall's first freeze usually shows up around 10/06, roughly 158 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Alden in Zone 5a (-20 to -15°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 6 weeks until Alden's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/30 isn't a guarantee
04/30 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/16 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/14 and only about 1 year in 10 sees frost after that.
Alden against the rest of the dataset
At roughly 158 frost-free days, Alden places 33,101 of 40,283 ZIP codes in this dataset. Within MN, it ranks 288 of 943.
Learn more
Before leaning on 56009's figures: local microclimates explains what one yard in Alden can differ from the 56009 normal, while zone vs. frost date explains why Zone 5a and Alden's frost date answer different questions.