Poplar Grove, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Poplar Grove, a village in Boone County, Illinois.
Today
84°F
Mostly Sunny
Mostly sunny, with a high near 84. South southwest wind 5 to 10 mph, with gusts as high as 20 mph.
7-day forecast for Poplar Grove
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Mostly Sunny | 5 to 10 mph SSW | 4% |
| Tonight | 65°F | Chance Showers And Thunderstorms | 0 to 5 mph WSW | 74% |
| Wednesday | 76°F | Showers And Thunderstorms Likely | 0 to 5 mph WNW | 74% |
| Wednesday Night | 60°F | Showers And Thunderstorms Likely | 0 to 5 mph WNW | 69% |
| Thursday | 78°F | Chance Rain Showers then Partly Sunny | 0 to 5 mph NE | 35% |
| Thursday Night | 58°F | Mostly Clear | 0 mph | 13% |
| Friday | 81°F | Mostly Sunny | 0 to 5 mph S | 5% |
| Friday Night | 61°F | Mostly Clear | 0 to 5 mph S | 6% |
| Saturday | 83°F | Mostly Sunny | 0 to 10 mph SSW | 10% |
| Saturday Night | 67°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 5 to 10 mph SSW | 23% |
| Sunday | 84°F | Slight Chance Showers And Thunderstorms | 5 to 15 mph SW | 23% |
| Sunday Night | 67°F | Chance Showers And Thunderstorms | 5 to 10 mph SSW | 44% |
| Monday | 83°F | Chance Rain Showers | 5 to 10 mph SSW | 43% |
| Monday Night | 66°F | Chance Showers And Thunderstorms | 5 to 10 mph WNW | 44% |
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 Aug 4, 2026.