Sparta, WI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sparta, a city in Monroe County, Wisconsin.
Tonight
53°F
Showers And Thunderstorms
Showers and thunderstorms. Some of the storms could produce heavy rain. Cloudy, with a low around 53. East wind 8 to 13 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New rainfall amounts between 2 and 3 inches possible.
7-day forecast for Sparta
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 53°F | Showers And Thunderstorms | 8 to 13 mph E | 99% |
| Saturday | 63°F | Showers And Thunderstorms | 6 to 10 mph E | 91% |
| Saturday Night | 51°F | Chance Showers And Thunderstorms | 6 to 10 mph NE | 50% |
| Sunday | 69°F | Partly Sunny | 6 to 12 mph NE | 11% |
| Sunday Night | 45°F | Mostly Cloudy | 7 mph NE | 4% |
| Monday | 64°F | Mostly Cloudy then Slight Chance Rain Showers | 5 to 9 mph NE | 21% |
| Monday Night | 42°F | Slight Chance Rain Showers | 2 to 6 mph NE | 21% |
| Tuesday | 63°F | Partly Sunny | 2 to 7 mph E | 14% |
| Tuesday Night | 41°F | Partly Cloudy | 0 to 3 mph NE | 4% |
| Wednesday | 67°F | Sunny | 0 to 3 mph NE | 2% |
| Wednesday Night | 44°F | Partly Cloudy | 1 mph NE | 4% |
| Thursday | 70°F | Partly Sunny | 1 mph SE | 5% |
| Thursday Night | 46°F | Partly Cloudy | 0 mph | 6% |
| Friday | 71°F | Mostly Sunny | 1 mph NE | 2% |
Forecast source: National Weather Service (api.weather.gov) for Sparta (43.938, -90.813). Updated through the day.
Growing snapshot for Sparta
Last spring frost
May 9
First fall frost
Oct 1
Growing season
144 days
Hardiness zone
4b
More local growing data for Sparta: nearby ZIP 54656 weather · frost dates · planting calendar · Wisconsin frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Sparta, Wi (3.8 mi from Sparta). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.