Marengo, WI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Marengo, a community in Ashland County, Wisconsin.
Tonight
50°F
Slight Chance Drizzle then Chance Rain Showers
A slight chance of drizzle before 1am, then patchy fog and a slight chance of drizzle between 1am and 3am, then a chance of rain showers between 3am and 4am, then a slight chance of drizzle. Mostly cloudy, with a low around 50. East wind 0 to 5 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Marengo
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 50°F | Slight Chance Drizzle then Chance Rain Showers | 0 to 5 mph E | 31% |
| Saturday | 67°F | Slight Chance Drizzle then Mostly Cloudy | 0 to 5 mph NE | 23% |
| Saturday Night | 48°F | Areas Of Fog | 0 to 5 mph N | 9% |
| Sunday | 60°F | Partly Sunny | 5 to 15 mph NE | 0% |
| Sunday Night | 39°F | Mostly Cloudy | 0 to 10 mph NE | 0% |
| Monday | 65°F | Partly Sunny | 0 to 10 mph NE | 0% |
| Monday Night | 36°F | Partly Cloudy | 0 to 10 mph NE | 0% |
| Tuesday | 68°F | Sunny | 0 to 10 mph NE | 1% |
| Tuesday Night | 37°F | Mostly Clear | 0 to 5 mph E | 1% |
| Wednesday | 71°F | Sunny | 0 to 5 mph E | 1% |
| Wednesday Night | 42°F | Partly Cloudy | 0 to 5 mph SE | 2% |
| Thursday | 73°F | Mostly Sunny | 0 to 5 mph SW | 5% |
| Thursday Night | 45°F | Partly Cloudy | 0 to 5 mph N | 5% |
| Friday | 75°F | Mostly Sunny | 0 to 5 mph NW | 2% |
Forecast source: National Weather Service (api.weather.gov) for Marengo (46.422, -90.808). Updated through the day.
Growing snapshot for Marengo
Last spring frost
May 26
First fall frost
Sep 27
Growing season
125 days
Hardiness zone
4b
More local growing data for Marengo: nearby ZIP 54855 weather · frost dates · planting calendar · Wisconsin frost dates
Nearby towns & communities
Ashland
Bayfront
Butternut
Clam Lake
Diaperville
Franks Field
Glidden
Jolmaville
Mellen
New Odanah
Odanah
Park Falls
Climate data from the nearest NOAA station, Mellen 4 Ne, Wi (8.9 mi from Marengo). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.