Sparta, WI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sparta, a city in Monroe County, Wisconsin.
Today
80°F
Mostly Cloudy then Isolated Rain Showers
Isolated rain showers after 4pm. Mostly cloudy. High near 80, with temperatures falling to around 77 in the afternoon. West wind 3 to 8 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Sparta
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 80°F | Mostly Cloudy then Isolated Rain Showers | 3 to 8 mph W | 22% |
| Tonight | 58°F | Scattered Showers And Thunderstorms | 2 mph W | 36% |
| Wednesday | 79°F | Partly Sunny | 0 to 3 mph NW | 3% |
| Wednesday Night | 53°F | Mostly Clear | 2 mph SW | 0% |
| Thursday | 84°F | Sunny | 2 mph SW | 0% |
| Thursday Night | 58°F | Mostly Clear | 2 mph S | 0% |
| Friday | 87°F | Sunny | 1 to 8 mph SW | 5% |
| Friday Night | 62°F | Slight Chance Showers And Thunderstorms | 2 to 7 mph SW | 16% |
| Saturday | 87°F | Mostly Sunny | 2 to 7 mph SW | 10% |
| Saturday Night | 65°F | Chance Showers And Thunderstorms | 2 to 7 mph SW | 38% |
| Sunday | 87°F | Chance Rain Showers | 2 to 7 mph W | 38% |
| Sunday Night | 64°F | Chance Showers And Thunderstorms | 0 to 6 mph SE | 40% |
| Monday | 85°F | Chance Rain Showers then Slight Chance Showers And Thunderstorms | 1 to 5 mph S | 40% |
| Monday Night | 63°F | Chance Showers And Thunderstorms | 1 to 5 mph NE | 29% |
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 Aug 4, 2026.