Cottage Grove, MN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Cottage Grove, a city in Washington County, Minnesota.
This Afternoon
61°F
Showers And Thunderstorms
Showers and thunderstorms. Mostly cloudy, with a high near 61. East wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
7-day forecast for Cottage Grove
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 61°F | Showers And Thunderstorms | 15 mph E | 91% |
| Tonight | 55°F | Showers And Thunderstorms | 10 to 15 mph ESE | 90% |
| Saturday | 64°F | Rain Showers Likely then Drizzle Likely | 10 mph ENE | 72% |
| 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 E | 8% |
| Monday Night | 43°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 | 12% |
| Thursday Night | 51°F | Partly Cloudy | 0 to 5 mph SSE | 9% |
Forecast source: National Weather Service (api.weather.gov) for Cottage Grove (44.813, -92.914). Updated through the day.
Growing snapshot for Cottage Grove
Last spring frost
Apr 23
First fall frost
Oct 19
Growing season
177 days
Hardiness zone
5a
More local growing data for Cottage Grove: nearby ZIP 55016 weather · frost dates · planting calendar · Minnesota frost dates
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Mahtomedi
Marine on St. Croix
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Climate data from the nearest NOAA station, Hastings Dam 2, Mn (5.1 mi from Cottage Grove). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 18, 2026.