Dennison, MN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Dennison, a city in Goodhue County, Minnesota.
Overnight
55°F
Patchy Fog
Patchy fog and a chance of showers and thunderstorms before 1am, then a chance of showers and thunderstorms. Cloudy. Low around 55, with temperatures rising to around 58 overnight. East wind 10 to 15 mph. Chance of precipitation is 50%. New rainfall amounts between a half and three quarters of an inch possible.
7-day forecast for Dennison
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 55°F | Patchy Fog | 10 to 15 mph E | 52% |
| Saturday | 64°F | Chance Rain Showers | 10 mph ENE | 32% |
| Saturday Night | 53°F | Slight Chance Drizzle then Mostly Cloudy | 5 to 10 mph NNE | 9% |
| Sunday | 67°F | Partly Sunny | 10 mph NE | 3% |
| Sunday Night | 48°F | Mostly Cloudy | 5 to 10 mph ENE | 6% |
| Monday | 62°F | Mostly Cloudy then Slight Chance Rain Showers | 5 to 10 mph ENE | 17% |
| Monday Night | 44°F | Slight Chance Rain Showers then Mostly Cloudy | 5 mph ENE | 17% |
| Tuesday | 62°F | Mostly Sunny | 5 mph E | 5% |
| Tuesday Night | 43°F | Partly Cloudy | 0 to 5 mph ESE | 2% |
| Wednesday | 65°F | Sunny | 0 to 5 mph SE | 0% |
| Wednesday Night | 47°F | Partly Cloudy | 0 to 5 mph SSE | 8% |
| Thursday | 68°F | Mostly Sunny | 0 to 5 mph S | 10% |
| Thursday Night | 50°F | Partly Cloudy | 0 to 5 mph SSE | 6% |
| Friday | 70°F | Mostly Sunny | 0 to 5 mph SSE | 6% |
Forecast source: National Weather Service (api.weather.gov) for Dennison (44.409, -93.030). Updated through the day.
Growing snapshot for Dennison
Last spring frost
May 5
First fall frost
Oct 5
Growing season
152 days
Hardiness zone
4b
More local growing data for Dennison: nearby ZIP 55018 weather · frost dates · planting calendar · Minnesota frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Faribault, Mn (15.7 mi from Dennison). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.