Grantfork, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Grantfork, a village in Madison County, Illinois.
This Afternoon
59°F
Mostly Cloudy
Mostly cloudy, with a high near 59. West wind 7 to 10 mph.
7-day forecast for Grantfork
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 59°F | Mostly Cloudy | 7 to 10 mph W | 0% |
| Tonight | 43°F | Partly Cloudy | 6 mph SW | 0% |
| Thursday | 62°F | Mostly Sunny | 6 to 13 mph W | 7% |
| Thursday Night | 43°F | Isolated Rain Showers then Mostly Cloudy | 6 mph NW | 16% |
| Friday | 54°F | Partly Sunny | 7 to 12 mph N | 5% |
| Friday Night | 31°F | Mostly Clear | 1 to 7 mph N | 0% |
| Saturday | 53°F | Sunny | 1 to 5 mph N | 0% |
| Saturday Night | 30°F | Mostly Clear | 2 mph NW | 0% |
| Sunday | 58°F | Sunny | 0 to 5 mph W | 0% |
| Sunday Night | 33°F | Clear | 1 mph NW | 0% |
| Monday | 64°F | Sunny | 0 to 5 mph SW | 0% |
| Monday Night | 37°F | Clear | 2 mph SW | 0% |
| Tuesday | 65°F | Sunny | 3 mph W | 2% |
| Tuesday Night | 39°F | Mostly Clear | 1 mph NW | 3% |
Forecast source: National Weather Service (api.weather.gov) for Grantfork (38.826, -89.667). Updated through the day.
Growing snapshot for Grantfork
Last spring frost
Apr 6
First fall frost
Oct 29
Growing season
204 days
Hardiness zone
6b
More local growing data for Grantfork: nearby ZIP 62249 weather · frost dates · planting calendar · Illinois frost dates
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Climate data from the nearest NOAA station, Carlyle Rsvr, Il (18.7 mi from Grantfork). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 5, 2026.