Prairie Grove, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Prairie Grove, a village in Mchenry County, Illinois.
Overnight
59°F
Rain Showers
Rain showers. Cloudy. Low around 59, with temperatures rising to around 62 overnight. South wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Prairie Grove
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 59°F | Rain Showers | 15 mph S | 82% |
| Wednesday | 63°F | Chance Rain Showers | 15 mph SSW | 31% |
| Wednesday Night | 46°F | Mostly Cloudy then Slight Chance Rain Showers | 15 mph SW | 16% |
| Thursday | 55°F | Chance Rain Showers | 10 to 15 mph WSW | 52% |
| Thursday Night | 39°F | Chance Rain Showers then Cloudy | 10 mph NNW | 50% |
| Friday | 49°F | Partly Sunny | 10 to 15 mph NNW | 11% |
| Friday Night | 32°F | Partly Cloudy | 5 to 10 mph NNW | 0% |
| Saturday | 51°F | Sunny | 0 to 5 mph NW | 0% |
| Saturday Night | 33°F | Partly Cloudy | 0 mph | 0% |
| Sunday | 55°F | Sunny | 5 to 10 mph W | 6% |
| Sunday Night | 34°F | Mostly Clear | 0 to 5 mph W | 0% |
| Monday | 60°F | Sunny | 0 to 10 mph WSW | 0% |
| Monday Night | 39°F | Partly Cloudy | 5 mph WSW | 1% |
| Tuesday | 61°F | Sunny | 0 to 5 mph WNW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Prairie Grove (42.274, -88.270). Updated through the day.
Growing snapshot for Prairie Grove
Last spring frost
May 1
First fall frost
Oct 11
Growing season
162 days
Hardiness zone
5b
More local growing data for Prairie Grove: nearby ZIP 60012 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
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Climate data from the nearest NOAA station, Mc Henry -Wg Stratton L&D, Il (3.9 mi from Prairie Grove). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.