Winthrop, MN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Winthrop, a city in Sibley County, Minnesota.
Tonight
57°F
Patchy Fog
Patchy fog and showers and thunderstorms likely before 1am, then a chance of drizzle and patchy fog. Cloudy, with a low around 57. East northeast wind around 10 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Winthrop
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 57°F | Patchy Fog | 10 mph ENE | 47% |
| Saturday | 64°F | Slight Chance Drizzle | 10 mph NE | 19% |
| Saturday Night | 53°F | Mostly Cloudy | 10 mph NNE | 14% |
| Sunday | 66°F | Partly Sunny | 10 to 15 mph NE | 3% |
| Sunday Night | 50°F | Mostly Cloudy | 10 mph ENE | 12% |
| Monday | 62°F | Chance Rain Showers | 10 mph ENE | 32% |
| Monday Night | 45°F | Chance Rain Showers then Mostly Cloudy | 5 mph ENE | 28% |
| Tuesday | 63°F | Mostly Sunny | 5 to 10 mph E | 4% |
| Tuesday Night | 44°F | Mostly Clear | 0 to 5 mph ESE | 1% |
| Wednesday | 65°F | Sunny | 0 to 5 mph SE | 1% |
| Wednesday Night | 48°F | Partly Cloudy then Slight Chance Rain Showers | 0 to 5 mph SSE | 17% |
| Thursday | 69°F | Slight Chance Rain Showers then Mostly Sunny | 0 to 5 mph SSE | 17% |
| Thursday Night | 52°F | Partly Cloudy | 0 to 5 mph SE | 7% |
| Friday | 70°F | Mostly Sunny | 0 to 5 mph SE | 7% |
Forecast source: National Weather Service (api.weather.gov) for Winthrop (44.542, -94.360). Updated through the day.
Growing snapshot for Winthrop
Last spring frost
Apr 24
First fall frost
Oct 15
Growing season
170 days
Hardiness zone
4b
More local growing data for Winthrop: nearby ZIP 55396 weather · frost dates · planting calendar · Minnesota frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Gaylord, Mn (7.2 mi from Winthrop). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.