Prairie Grove, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Prairie Grove, a village in Mchenry County, Illinois.
This Afternoon
68°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely. Cloudy, with a high near 68. East southeast wind around 5 mph, with gusts as high as 10 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Prairie Grove
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 68°F | Showers And Thunderstorms Likely | 5 mph ESE | 74% |
| Tonight | 62°F | Showers And Thunderstorms | 5 to 10 mph NE | 100% |
| Sunday | 65°F | Showers And Thunderstorms | 10 to 15 mph NE | 86% |
| Sunday Night | 54°F | Slight Chance Rain Showers then Mostly Cloudy | 10 to 15 mph NE | 17% |
| Monday | 63°F | Chance Rain Showers | 15 mph ENE | 35% |
| Monday Night | 50°F | Chance Rain Showers | 10 to 15 mph ENE | 32% |
| Tuesday | 61°F | Chance Rain Showers | 10 to 15 mph NE | 32% |
| Tuesday Night | 50°F | Mostly Cloudy | 5 to 10 mph NE | 13% |
| Wednesday | 62°F | Partly Sunny | 5 to 10 mph NE | 14% |
| Wednesday Night | 51°F | Mostly Cloudy | 0 to 5 mph NNE | 5% |
| Thursday | 66°F | Partly Sunny | 0 to 5 mph NE | 7% |
| Thursday Night | 52°F | Mostly Cloudy | 0 to 5 mph NE | 12% |
| Friday | 70°F | Partly Sunny | 0 to 5 mph NE | 10% |
| Friday Night | 52°F | Partly Cloudy | 0 to 5 mph NNE | 3% |
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
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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 Sep 19, 2026.