Grand Marais, MN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Grand Marais, a city in Cook County, Minnesota.
Today
72°F
Sunny
Sunny, with a high near 72. West wind around 10 mph, with gusts as high as 20 mph.
7-day forecast for Grand Marais
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 72°F | Sunny | 10 mph W | 2% |
| Tonight | 50°F | Mostly Clear | 0 to 5 mph NW | 0% |
| Wednesday | 69°F | Sunny | 0 to 5 mph SW | 0% |
| Wednesday Night | 52°F | Mostly Clear | 0 to 5 mph SW | 1% |
| Thursday | 75°F | Mostly Sunny | 0 to 10 mph SW | 4% |
| Thursday Night | 57°F | Partly Cloudy | 5 mph SW | 5% |
| Friday | 76°F | Sunny then Slight Chance Showers And Thunderstorms | 5 mph SW | 21% |
| Friday Night | 55°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 5 mph W | 30% |
| Saturday | 74°F | Slight Chance Rain Showers | 5 mph W | 21% |
| Saturday Night | 55°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 0 to 5 mph NW | 24% |
| Sunday | 75°F | Slight Chance Showers And Thunderstorms | 0 to 5 mph W | 24% |
| Sunday Night | 54°F | Partly Cloudy | 0 to 5 mph NW | 10% |
| Monday | 73°F | Partly Sunny | 0 to 5 mph W | 11% |
| Monday Night | 53°F | Slight Chance Rain Showers | 0 to 5 mph NW | 15% |
Forecast source: National Weather Service (api.weather.gov) for Grand Marais (47.759, -90.344). Updated through the day.
Growing snapshot for Grand Marais
Last spring frost
May 23
First fall frost
Sep 26
Growing season
124 days
Hardiness zone
3b
More local growing data for Grand Marais: nearby ZIP 55604 weather · frost dates · planting calendar · Minnesota frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Gunflint Lake 10 Nw, Mn (18.2 mi from Grand Marais). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.