Onalaska, WI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Onalaska, a city in La Crosse County, Wisconsin.
This Afternoon
66°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely. Mostly cloudy. High near 66, with temperatures falling to around 64 in the afternoon. East wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for Onalaska
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 66°F | Showers And Thunderstorms Likely | 10 mph E | 74% |
| Tonight | 57°F | Showers And Thunderstorms | 8 to 12 mph E | 90% |
| Saturday | 69°F | Showers And Thunderstorms Likely | 7 mph E | 67% |
| Saturday Night | 55°F | Rain Showers Likely | 8 mph NE | 67% |
| Sunday | 69°F | Partly Sunny | 8 to 12 mph NE | 11% |
| Sunday Night | 49°F | Mostly Cloudy | 8 mph NE | 6% |
| Monday | 64°F | Mostly Cloudy then Chance Rain Showers | 7 to 10 mph NE | 30% |
| Monday Night | 45°F | Chance Rain Showers | 3 to 8 mph NE | 30% |
| Tuesday | 63°F | Partly Sunny | 5 to 8 mph E | 11% |
| Tuesday Night | 44°F | Partly Cloudy | 1 to 5 mph NE | 4% |
| Wednesday | 67°F | Sunny | 1 to 5 mph E | 1% |
| Wednesday Night | 48°F | Partly Cloudy | 2 mph E | 4% |
| Thursday | 69°F | Partly Sunny | 2 mph S | 6% |
| Thursday Night | 50°F | Partly Cloudy | 1 mph NW | 6% |
Forecast source: National Weather Service (api.weather.gov) for Onalaska (43.890, -91.204). Updated through the day.
Growing snapshot for Onalaska
Last spring frost
Apr 23
First fall frost
Oct 17
Growing season
177 days
Hardiness zone
5a
More local growing data for Onalaska: nearby ZIP 54650 weather · frost dates · planting calendar · Wisconsin frost dates
Nearby towns & communities
Bangor
Brice Prairie
Coon Valley
French Island
Holmen
La Crosse
Mindoro
Rockland
St. Joseph
West Salem
Climate data from the nearest NOAA station, La Crosse Muni Ap, Wi (2.5 mi from Onalaska). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 18, 2026.