Beaver Bay, MN 55601 Frost Dates
Frost dates for Beaver Bay, MN, ZIP 55601
Around 05/15 is the usual last spring frost, about 260 days away. The first fall frost typically arrives around 10/01, about 137 frost-free days later.
Zone 4a (-30 to -25°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 Beaver Bay, not a forecast for this year.
What to do before the first frost
Zone 4a around Beaver Bay has about 5 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
Why 05/15 isn't a guarantee
05/15 is the middle of 30 years of NOAA records, not a promise. Plant by 04/30 and you're betting against frost in roughly 9 years out of 10. 05/31 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Beaver Bay compares
At roughly 137 frost-free days, Beaver Bay places 37,597 of 40,283 ZIP codes in this dataset. Within MN, it ranks 789 of 943.
Learn more
the frost range explains how to read the range around Beaver Bay's dates instead of trusting one, and local microclimates explains what one yard in Beaver Bay can differ from the 55601 normal.