Portage, WI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Portage, a city in Columbia County, Wisconsin.
This Afternoon
66°F
Rain Showers
Rain showers. Cloudy, with a high near 66. East wind around 10 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Portage
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 66°F | Rain Showers | 10 mph E | 90% |
| Tonight | 55°F | Showers And Thunderstorms | 10 mph E | 94% |
| Saturday | 68°F | Showers And Thunderstorms | 5 to 10 mph E | 85% |
| Saturday Night | 54°F | Showers And Thunderstorms | 10 mph NE | 77% |
| Sunday | 66°F | Chance Rain Showers | 10 to 15 mph NE | 29% |
| Sunday Night | 48°F | Mostly Cloudy | 10 mph NE | 10% |
| Monday | 61°F | Slight Chance Rain Showers | 10 to 15 mph NE | 15% |
| Monday Night | 45°F | Slight Chance Rain Showers | 5 to 10 mph NE | 24% |
| Tuesday | 60°F | Slight Chance Rain Showers then Partly Sunny | 5 to 10 mph NE | 24% |
| Tuesday Night | 43°F | Partly Cloudy | 0 to 5 mph NE | 5% |
| Wednesday | 64°F | Mostly Sunny | 0 to 5 mph NE | 4% |
| Wednesday Night | 46°F | Partly Cloudy | 0 to 5 mph NE | 1% |
| Thursday | 67°F | Mostly Sunny | 0 to 5 mph NE | 4% |
| Thursday Night | 47°F | Partly Cloudy | 0 mph | 6% |
Forecast source: National Weather Service (api.weather.gov) for Portage (43.549, -89.466). Updated through the day.
Growing snapshot for Portage
Last spring frost
Apr 28
First fall frost
Oct 10
Growing season
164 days
Hardiness zone
5a
More local growing data for Portage: nearby ZIP 53901 weather · frost dates · planting calendar · Wisconsin frost dates
Nearby towns & communities
Arlington
Cambria
Columbus
Dekorra
Doylestown
Fall River
Friesland
Lake Wisconsin
Lodi
Pardeeville
Poynette
Randolph
Rio
Wyocena
Climate data from the nearest NOAA station, Portage Wwtp, Wi (3.1 mi from Portage). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.