Oslo, MN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Oslo, a city in Marshall County, Minnesota.
Tonight
52°F
Mostly Cloudy
Mostly cloudy. Low around 52, with temperatures rising to around 54 overnight. South southeast wind 3 to 10 mph.
7-day forecast for Oslo
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 52°F | Mostly Cloudy | 3 to 10 mph SSE | 3% |
| Saturday | 70°F | Mostly Cloudy | 2 to 14 mph ENE | 14% |
| Saturday Night | 48°F | Mostly Cloudy | 8 to 14 mph NNE | 0% |
| Sunday | 68°F | Mostly Cloudy | 7 to 10 mph NE | 0% |
| Sunday Night | 44°F | Mostly Cloudy | 3 to 8 mph E | 0% |
| Monday | 69°F | Sunny | 3 to 8 mph SE | 0% |
| Monday Night | 43°F | Mostly Clear | 6 to 9 mph SE | 0% |
| Tuesday | 69°F | Sunny | 9 to 16 mph SSE | 0% |
| Tuesday Night | 47°F | Partly Cloudy | 10 to 14 mph SSE | 3% |
| Wednesday | 70°F | Partly Sunny | 13 to 18 mph SSE | 8% |
| Wednesday Night | 52°F | Mostly Cloudy | 12 to 15 mph SSE | 12% |
| Thursday | 73°F | Mostly Sunny | 10 to 14 mph S | 12% |
| Thursday Night | 53°F | Mostly Clear | 10 mph SSE | 8% |
| Friday | 74°F | Mostly Sunny | 9 to 15 mph S | 8% |
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 Sep 19, 2026.