Poplar Grove, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Poplar Grove, a village in Boone County, Illinois.
This Afternoon
70°F
Chance Rain Showers
A chance of rain showers. Mostly cloudy, with a high near 70. East wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Poplar Grove
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 70°F | Chance Rain Showers | 15 mph E | 29% |
| Tonight | 61°F | Slight Chance Rain Showers then Showers And Thunderstorms Likely | 10 mph E | 73% |
| Saturday | 75°F | Showers And Thunderstorms then Showers And Thunderstorms Likely | 5 to 10 mph ESE | 94% |
| Saturday Night | 61°F | Showers And Thunderstorms Likely then Showers And Thunderstorms | 5 to 10 mph ENE | 76% |
| Sunday | 67°F | Showers And Thunderstorms Likely | 10 to 15 mph NE | 66% |
| Sunday Night | 54°F | Chance Rain Showers | 15 mph NE | 44% |
| Monday | 63°F | Chance Rain Showers | 15 mph ENE | 38% |
| Monday Night | 49°F | Chance Rain Showers | 10 to 15 mph NE | 38% |
| Tuesday | 62°F | Chance Rain Showers | 10 to 15 mph NE | 26% |
| Tuesday Night | 48°F | Mostly Cloudy | 5 to 10 mph NE | 11% |
| Wednesday | 64°F | Partly Sunny | 5 to 10 mph NE | 6% |
| Wednesday Night | 49°F | Partly Cloudy | 0 to 10 mph NE | 4% |
| Thursday | 66°F | Partly Sunny | 0 to 5 mph NNE | 5% |
| Thursday Night | 50°F | Mostly Cloudy | 0 to 5 mph NE | 4% |
Forecast source: National Weather Service (api.weather.gov) for Poplar Grove (42.351, -88.844). Updated through the day.
Growing snapshot for Poplar Grove
Last spring frost
Apr 30
First fall frost
Oct 10
Growing season
161 days
Hardiness zone
5b
More local growing data for Poplar Grove: nearby ZIP 61065 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Clinton Wwtp, Wi (10.5 mi from Poplar Grove). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.