Sparta, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sparta, a city in Randolph County, Illinois.
Tonight
70°F
Partly Cloudy
Partly cloudy, with a low around 70. Southeast wind 1 to 5 mph.
7-day forecast for Sparta
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 70°F | Partly Cloudy | 1 to 5 mph SE | 13% |
| Saturday | 97°F | Mostly Sunny | 6 mph SW | 6% |
| Saturday Night | 71°F | Partly Cloudy | 5 mph S | 0% |
| Sunday | 95°F | Mostly Sunny | 6 mph W | 8% |
| Sunday Night | 66°F | Mostly Cloudy then Chance Showers And Thunderstorms | 5 mph N | 41% |
| Monday | 83°F | Showers And Thunderstorms Likely | 3 to 8 mph N | 56% |
| Monday Night | 59°F | Showers And Thunderstorms Likely | 8 mph N | 56% |
| Tuesday | 73°F | Slight Chance Rain Showers then Partly Sunny | 8 to 12 mph N | 17% |
| Tuesday Night | 54°F | Mostly Cloudy | 5 to 10 mph N | 7% |
| Wednesday | 74°F | Mostly Sunny | 8 mph N | 3% |
| Wednesday Night | 54°F | Partly Cloudy | 2 to 6 mph N | 2% |
| Thursday | 76°F | Mostly Sunny | 3 to 7 mph N | 1% |
| Thursday Night | 56°F | Partly Cloudy | 2 to 6 mph N | 2% |
| Friday | 76°F | Mostly Sunny | 3 to 8 mph N | 4% |
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 Sep 19, 2026.