Marengo, WI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Marengo, a community in Ashland County, Wisconsin.
Today
77°F
Mostly Sunny
Mostly sunny, with a high near 77. West wind around 10 mph.
7-day forecast for Marengo
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 77°F | Mostly Sunny | 10 mph W | 0% |
| Tonight | 52°F | Partly Cloudy | 0 to 10 mph W | 1% |
| Wednesday | 80°F | Sunny | 0 to 10 mph SW | 0% |
| Wednesday Night | 58°F | Mostly Clear | 5 to 10 mph SW | 0% |
| Thursday | 86°F | Sunny | 10 to 15 mph SW | 1% |
| Thursday Night | 65°F | Mostly Clear | 10 mph SW | 3% |
| Friday | 88°F | Sunny then Slight Chance Showers And Thunderstorms | 10 mph SW | 18% |
| Friday Night | 61°F | Chance Showers And Thunderstorms | 0 to 10 mph SW | 34% |
| Saturday | 84°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 0 to 5 mph W | 22% |
| Saturday Night | 60°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 0 to 5 mph W | 47% |
| Sunday | 80°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 0 to 5 mph W | 39% |
| Sunday Night | 57°F | Chance Showers And Thunderstorms | 0 to 5 mph NW | 27% |
| Monday | 79°F | Slight Chance Rain Showers | 0 to 5 mph N | 21% |
| Monday Night | 56°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 0 to 5 mph N | 19% |
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 Aug 4, 2026.