Grand Marais, MN 55612 Frost Dates
When can you plant in Grand Marais, MN?
The last spring frost here typically falls around 05/26, about 271 days from today. The first fall frost typically arrives around 09/27, about 126 frost-free days later.
Zone 3b (-35 to -30°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 Grand Marais, not a forecast for this year.
What to do before the first frost
About 4 weeks of growing season left in Grand Marais before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Grand Marais's last frost
05/26 is the middle of 30 years of NOAA records, not a promise. Plant by 05/09 and you're betting against frost in roughly 9 years out of 10. 06/06 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Grand Marais compares
About 126 days separate Grand Marais's last and first frost, putting it 38,690 of 40,283 ZIP codes nationally. Within MN, it ranks 878 of 943.
Learn more
the frost range covers how to read the range around Grand Marais's dates instead of trusting one. local microclimates covers what one yard in Grand Marais can differ from the 55612 normal.