Osseo, MN 55445 Frost Dates
Osseo, MN: when does the frost end?
The last spring frost here typically falls around 04/30, about 245 days from today. Fall's first freeze usually shows up around 10/08, roughly 159 days after the last spring frost.
Zone 5a (-20 to -15°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Osseo, not a forecast for this year.
Stretching the season past the first frost
With roughly 6 weeks until Osseo's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
04/30 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/17 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/17 and only about 1 year in 10 sees frost after that.
Osseo against the rest of the dataset
Osseo's growing season runs about 159 days, ranking 32,663 of 40,283 US ZIP codes measured here, longest to shortest. Within MN, it ranks 258 of 943.
Learn more
Before leaning on 55445's figures: local microclimates explains what one yard in Osseo can differ from the 55445 normal, while zone vs. frost date explains why Zone 5a and Osseo's frost date answer different questions.