Donnelly, MN 56235 Frost Dates
Donnelly, 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 10/01, roughly 150 days after the last spring frost.
Donnelly sits in USDA Zone 4b (-25 to -20°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 Donnelly'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 05/17 and only about 1 year in 10 sees frost after that.
Donnelly against the rest of the dataset
Donnelly's growing season runs about 150 days, ranking 35,425 of 40,283 US ZIP codes measured here, longest to shortest. Within MN, it ranks 546 of 943.
Learn more
Before leaning on 56235's figures: local microclimates explains what one yard in Donnelly can differ from the 56235 normal, while zone vs. frost date explains why Zone 4b and Donnelly's frost date answer different questions.