Duluth, MN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Duluth, a city in St. Louis County, Minnesota.
Today
73°F
Sunny
Sunny, with a high near 73. West wind around 10 mph, with gusts as high as 20 mph.
7-day forecast for Duluth
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 73°F | Sunny | 10 mph W | 0% |
| Tonight | 54°F | Mostly Clear | 0 to 10 mph W | 0% |
| Wednesday | 77°F | Sunny | 0 to 10 mph SW | 0% |
| Wednesday Night | 59°F | Partly Cloudy | 0 to 5 mph SW | 2% |
| Thursday | 84°F | Sunny | 10 to 15 mph SW | 7% |
| Thursday Night | 65°F | Mostly Clear | 10 mph SW | 5% |
| Friday | 86°F | Sunny then Slight Chance Showers And Thunderstorms | 10 mph SW | 18% |
| Friday Night | 61°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 5 to 10 mph W | 29% |
| Saturday | 78°F | Slight Chance Showers And Thunderstorms | 5 mph N | 20% |
| Saturday Night | 61°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 5 mph NW | 36% |
| Sunday | 76°F | Slight Chance Showers And Thunderstorms | 5 mph NW | 23% |
| Sunday Night | 60°F | Slight Chance Rain Showers then Partly Cloudy | 0 to 5 mph NW | 18% |
| Monday | 75°F | Slight Chance Rain Showers | 5 mph N | 21% |
| Monday Night | 58°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 5 mph N | 19% |
Forecast source: National Weather Service (api.weather.gov) for Duluth (46.774, -92.134). Updated through the day.
Growing snapshot for Duluth
Last spring frost
May 14
First fall frost
Oct 12
Growing season
149 days
Hardiness zone
4b
More local growing data for Duluth: nearby ZIP 55806 weather · frost dates · planting calendar · Minnesota frost dates
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Climate data from the nearest NOAA station, Duluth Harbor Stn, Mn (1.8 mi from Duluth). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.