Dennison, MN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Dennison, a city in Goodhue County, Minnesota.
Tonight
48°F
Light Rain
Rain and patchy fog before midnight, then rain and a slight chance of thunderstorms. Cloudy. Low around 48, with temperatures rising to around 52 overnight. North northwest wind 5 to 10 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for Dennison
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 48°F | Light Rain | 5 to 10 mph NNW | 98% |
| Wednesday | 54°F | Light Rain | 5 to 10 mph WSW | 86% |
| Wednesday Night | 42°F | Light Rain | 10 mph NW | 88% |
| Thursday | 48°F | Light Rain Likely | 10 to 15 mph N | 62% |
| Thursday Night | 33°F | Mostly Cloudy | 5 to 10 mph NNE | 6% |
| Friday | 46°F | Partly Sunny | 0 to 5 mph NNE | 0% |
| Friday Night | 29°F | Partly Cloudy | 0 mph | 0% |
| Saturday | 52°F | Mostly Sunny | 0 to 5 mph SW | 1% |
| Saturday Night | 34°F | Partly Cloudy | 5 mph WSW | 9% |
| Sunday | 56°F | Sunny | 5 to 10 mph W | 9% |
| Sunday Night | 35°F | Partly Cloudy | 5 mph SW | 1% |
| Monday | 58°F | Mostly Sunny | 5 to 10 mph WSW | 0% |
| Monday Night | 37°F | Mostly Clear | 5 mph W | 1% |
| Tuesday | 55°F | Sunny | 5 mph W | 2% |
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 Nov 4, 2026.