Marble, MN 55764 Frost Dates
Marble, MN: when does the frost end?
The last spring frost here typically falls around 05/17, about 262 days from today. Fall's first freeze usually shows up around 09/24, roughly 130 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Marble in Zone 4a (-30 to -25°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 4 weeks until Marble's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 05/17 isn't a guarantee
05/17 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/03 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/31 and only about 1 year in 10 sees frost after that.
Marble against the rest of the dataset
Marble's growing season runs about 130 days, ranking 38,403 of 40,283 US ZIP codes measured here, longest to shortest. Within MN, it ranks 851 of 943.
Learn more
Before leaning on 55764's figures: local microclimates explains what one yard in Marble can differ from the 55764 normal, while zone vs. frost date explains why Zone 4a and Marble's frost date answer different questions.