Sparta, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sparta, a city in Randolph County, Illinois.
Overnight
65°F
Clear
Clear, with a low around 65. Southeast wind around 1 mph.
7-day forecast for Sparta
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 65°F | Clear | 1 mph SE | 0% |
| Tuesday | 86°F | Patchy Fog then Sunny | 1 mph E | 0% |
| Tuesday Night | 65°F | Mostly Clear | 2 mph SE | 0% |
| Wednesday | 89°F | Sunny | 3 mph S | 2% |
| Wednesday Night | 69°F | Partly Cloudy then Chance Showers And Thunderstorms | 5 mph S | 39% |
| Thursday | 87°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 5 mph SW | 58% |
| Thursday Night | 69°F | Chance Showers And Thunderstorms | 2 mph S | 56% |
| Friday | 87°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 3 mph SW | 56% |
| Friday Night | 69°F | Chance Showers And Thunderstorms | 1 mph S | 42% |
| Saturday | 88°F | Chance Showers And Thunderstorms | 3 mph S | 42% |
| Saturday Night | 70°F | Partly Cloudy | 5 mph S | 11% |
| Sunday | 90°F | Sunny | 6 mph S | 7% |
| Sunday Night | 72°F | Mostly Clear | 7 mph S | 5% |
| Monday | 92°F | Sunny | 7 mph S | 5% |
Forecast source: National Weather Service (api.weather.gov) for Sparta (38.139, -89.731). Updated through the day.
Growing snapshot for Sparta
Last spring frost
Apr 12
First fall frost
Oct 22
Growing season
191 days
Hardiness zone
7a
More local growing data for Sparta: nearby ZIP 62286 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Sparta 1 W, Il (0.1 mi from Sparta). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.