Sparta, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sparta, a city in Randolph County, Illinois.
This Afternoon
73°F
Rain
Rain and a slight chance of thunderstorms. Cloudy, with a high near 73. South wind 16 to 21 mph, with gusts as high as 31 mph. Chance of precipitation is 90%.
7-day forecast for Sparta
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 73°F | Rain | 16 to 21 mph S | 87% |
| Tonight | 54°F | Rain | 7 to 15 mph S | 99% |
| Wednesday | 65°F | Mostly Cloudy | 5 to 10 mph SW | 7% |
| Wednesday Night | 43°F | Partly Cloudy | 3 mph SW | 0% |
| Thursday | 68°F | Sunny | 3 to 7 mph SW | 0% |
| Thursday Night | 44°F | Mostly Cloudy | 5 mph W | 5% |
| Friday | 59°F | Partly Sunny | 5 to 10 mph NW | 3% |
| Friday Night | 39°F | Partly Cloudy | 5 mph N | 0% |
| Saturday | 56°F | Partly Sunny | 3 mph NW | 0% |
| Saturday Night | 35°F | Partly Cloudy | 1 mph NW | 1% |
| Sunday | 62°F | Sunny | 1 to 6 mph W | 4% |
| Sunday Night | 35°F | Mostly Clear | 2 mph W | 5% |
| Monday | 65°F | Sunny | 2 to 7 mph W | 2% |
| Monday Night | 39°F | Mostly Clear | 2 mph SW | 0% |
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 Nov 3, 2026.