Big Lake, MN 55309 Frost Dates
Big Lake, MN: when does the frost end?
Around 05/04 is the usual last spring frost, about 249 days away. Fall's first freeze usually shows up around 10/05, roughly 154 days after the last spring frost.
Zone 4b (-25 to -20°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 Big Lake, not a forecast for this year.
Stretching the season past the first frost
With roughly 5 weeks until Big Lake's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Big Lake's last frost
05/04 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/22 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/18 and only about 1 year in 10 sees frost after that.
Big Lake against the rest of the dataset
At roughly 154 frost-free days, Big Lake places 34,238 of 40,283 ZIP codes in this dataset. Within MN, it ranks 382 of 943.
Learn more
Before leaning on 55309's figures: local microclimates explains what one yard in Big Lake can differ from the 55309 normal, while zone vs. frost date explains why Zone 4b and Big Lake's frost date answer different questions.