Brooks, MN 56715 Frost Dates
Brooks, MN: when does the frost end?
Typically, the last spring freeze lands around 05/09, roughly 254 days out. Fall's first freeze usually shows up around 09/30, roughly 142 days after the last spring frost.
Brooks sits in USDA Zone 3b (-35 to -30°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 Brooks's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 05/09 isn't a guarantee
05/09 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/27 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/24 and only about 1 year in 10 sees frost after that.
Brooks against the rest of the dataset
Brooks's growing season runs about 142 days, ranking 36,840 of 40,283 US ZIP codes measured here, longest to shortest. Within MN, it ranks 703 of 943.
Learn more
Before leaning on 56715's figures: local microclimates explains what one yard in Brooks can differ from the 56715 normal, while zone vs. frost date explains why Zone 3b and Brooks's frost date answer different questions.