Flensburg, MN 56328 Frost Dates
Flensburg, MN: when does the frost end?
The last spring frost here typically falls around 05/04, about 249 days from today. Fall's first freeze usually shows up around 10/05, roughly 151 days after the last spring frost.
Flensburg sits in USDA Zone 4a (-30 to -25°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 Flensburg's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 05/04 isn't a guarantee
05/04 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/21 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/22 and only about 1 year in 10 sees frost after that.
Flensburg against the rest of the dataset
Flensburg's growing season runs about 151 days, ranking 35,176 of 40,283 US ZIP codes measured here, longest to shortest. Within MN, it ranks 501 of 943.
Learn more
Before leaning on 56328's figures: local microclimates explains what one yard in Flensburg can differ from the 56328 normal, while zone vs. frost date explains why Zone 4a and Flensburg's frost date answer different questions.