Sparta, WI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sparta, a city in Monroe County, Wisconsin.
This Afternoon
68°F
Rain Showers
Rain showers. Cloudy. High near 68, with temperatures falling to around 63 in the afternoon. South wind around 8 mph, with gusts as high as 22 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Sparta
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 68°F | Rain Showers | 8 mph S | 83% |
| Tonight | 54°F | Rain Showers | 9 mph S | 96% |
| Wednesday | 58°F | Rain Showers | 7 to 13 mph S | 82% |
| Wednesday Night | 44°F | Rain Showers | 13 mph SW | 81% |
| Thursday | 51°F | Rain Showers | 10 mph NW | 75% |
| Thursday Night | 35°F | Mostly Cloudy | 7 to 12 mph N | 14% |
| Friday | 50°F | Partly Sunny | 1 to 8 mph N | 2% |
| Friday Night | 28°F | Partly Cloudy | 0 mph | 1% |
| Saturday | 54°F | Mostly Sunny | 2 mph W | 1% |
| Saturday Night | 32°F | Partly Cloudy | 1 mph W | 9% |
| Sunday | 58°F | Slight Chance Rain Showers | 1 to 7 mph W | 16% |
| Sunday Night | 33°F | Mostly Clear | 2 mph W | 3% |
| Monday | 62°F | Mostly Sunny | 1 to 10 mph SW | 0% |
| Monday Night | 36°F | Partly Cloudy | 5 mph W | 1% |
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 Nov 4, 2026.