Cottage Grove, MN Weather & Growing Conditions
Tonight
55°F
Patchy Fog
Patchy fog and showers and thunderstorms. Cloudy, with a low around 55. East wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 80%. New rainfall amounts between 1 and 2 inches possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 55°F | Patchy Fog | 10 to 15 mph E | 81% |
| Saturday | 64°F | Chance Rain Showers then Cloudy | 10 mph ENE | 47% |
| Saturday Night | 54°F | Slight Chance Drizzle then Mostly Cloudy | 5 to 10 mph NNE | 15% |
| Sunday | 69°F | Partly Sunny | 10 to 15 mph NE | 2% |
| Sunday Night | 48°F | Mostly Cloudy | 5 to 10 mph ENE | 2% |
| Monday | 65°F | Mostly Cloudy | 5 to 10 mph ENE | 8% |
| Monday Night | 44°F | Mostly Cloudy | 5 mph ENE | 7% |
| Tuesday | 65°F | Mostly Sunny | 5 to 10 mph E | 3% |
| Tuesday Night | 44°F | Partly Cloudy | 0 to 5 mph ESE | 1% |
| Wednesday | 67°F | Sunny | 0 to 5 mph SE | 0% |
| Wednesday Night | 48°F | Partly Cloudy | 0 to 5 mph SSE | 8% |
| Thursday | 70°F | Mostly Sunny | 0 to 5 mph SSE | 13% |
| Thursday Night | 51°F | Partly Cloudy | 0 to 5 mph SSE | 9% |
| Friday | 72°F | Mostly Sunny | 0 to 5 mph SE | 6% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Cottage Grove, MN
Last spring frost
Apr 23
First fall frost
Oct 19
Growing season
177 days
Hardiness zone
5a
Explore more for Cottage Grove, MN: full frost dates · planting calendar · Minnesota frost dates
Climate data from the nearest NOAA station, Hastings Dam 2, Mn (5.1 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.