Oslo, MN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Oslo, a city in Marshall County, Minnesota.
Today
72°F
Sunny
Sunny. High near 72, with temperatures falling to around 70 in the afternoon. West northwest wind around 15 mph.
7-day forecast for Oslo
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 72°F | Sunny | 15 mph WNW | 0% |
| Tonight | 48°F | Mostly Clear | 3 to 12 mph SW | 1% |
| Wednesday | 81°F | Sunny | 6 to 16 mph SW | 0% |
| Wednesday Night | 56°F | Slight Chance Rain Showers | 7 to 13 mph SW | 21% |
| Thursday | 83°F | Sunny | 6 to 14 mph WSW | 11% |
| Thursday Night | 57°F | Mostly Clear | 6 to 10 mph W | 2% |
| Friday | 80°F | Sunny | 7 to 14 mph NW | 2% |
| Friday Night | 54°F | Mostly Clear | 5 to 12 mph N | 8% |
| Saturday | 79°F | Mostly Sunny | 5 to 13 mph N | 9% |
| Saturday Night | 55°F | Partly Cloudy | 5 to 12 mph NNE | 11% |
| Sunday | 78°F | Mostly Sunny | 5 to 10 mph N | 11% |
| Sunday Night | 56°F | Partly Cloudy then Chance Rain Showers | 5 to 10 mph NNE | 25% |
| Monday | 78°F | Chance Rain Showers then Partly Sunny | 5 to 10 mph N | 25% |
| Monday Night | 55°F | Slight Chance Rain Showers | 5 to 10 mph N | 15% |
Forecast source: National Weather Service (api.weather.gov) for Oslo (48.196, -97.131). Updated through the day.
Growing snapshot for Oslo
Last spring frost
May 15
First fall frost
Sep 26
Growing season
134 days
Hardiness zone
4a
More local growing data for Oslo: nearby ZIP 56744 weather · frost dates · planting calendar · Minnesota frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Argyle, Mn (15 mi from Oslo). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.