Rollingstone, MN 55969 Frost Dates
Rollingstone, MN: when does the frost end?
Around 04/23 is the usual last spring frost, about 238 days away. Fall's first freeze usually shows up around 10/16, roughly 175 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Rollingstone in Zone 4b (-25 to -20°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 7 weeks until Rollingstone's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/23 isn't a guarantee
04/23 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/09 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/06 and only about 1 year in 10 sees frost after that.
Rollingstone against the rest of the dataset
Rollingstone's growing season runs about 175 days, ranking 27,140 of 40,283 US ZIP codes measured here, longest to shortest. Within MN, it ranks 60 of 943.
Learn more
Before leaning on 55969's figures: local microclimates explains what one yard in Rollingstone can differ from the 55969 normal, while zone vs. frost date explains why Zone 4b and Rollingstone's frost date answer different questions.