Silver Bay, MN 55613 Frost Dates
55613, near Silver Bay, MN: the frost window
Typically, the last spring freeze lands around 05/26, roughly 271 days out. Fall's first freeze usually shows up around 09/27, roughly 126 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Silver Bay 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
Silver Bay's growing season runs out in roughly 4 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
05/26 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/09 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/06 and only about 1 year in 10 sees frost after that.
Silver Bay against the rest of the dataset
About 126 days separate Silver Bay's last and first frost, putting it 38,689 of 40,283 ZIP codes nationally. Within MN, it ranks 877 of 943.
Learn more
Two guides worth reading on 55613: local microclimates, on what one yard in Silver Bay can differ from the 55613 normal, and zone vs. frost date, on why Zone 4b and Silver Bay's frost date answer different questions.