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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

WhenTempForecastWindPrecip
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

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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.