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
61°F
Patchy Drizzle
Patchy drizzle and isolated rain showers. Mostly cloudy. High near 61, with temperatures falling to around 54 in the afternoon. Southwest wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Poplar Grove
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 61°F | Patchy Drizzle | 15 mph SW | 22% |
| Tonight | 46°F | Patchy Drizzle | 15 mph SW | 28% |
| Thursday | 55°F | Chance Rain Showers | 10 to 15 mph W | 35% |
| Thursday Night | 38°F | Chance Rain Showers then Mostly Cloudy | 10 mph NNW | 34% |
| Friday | 48°F | Partly Sunny | 10 to 15 mph N | 6% |
| Friday Night | 30°F | Partly Cloudy | 0 to 10 mph NNW | 0% |
| Saturday | 50°F | Sunny | 0 to 5 mph NW | 0% |
| Saturday Night | 32°F | Mostly Clear | 0 to 5 mph W | 0% |
| Sunday | 55°F | Sunny | 5 to 10 mph W | 6% |
| Sunday Night | 33°F | Mostly Clear | 0 to 5 mph W | 0% |
| Monday | 60°F | Sunny | 0 to 10 mph SW | 0% |
| Monday Night | 38°F | Partly Cloudy | 5 to 10 mph W | 0% |
| Tuesday | 61°F | Sunny | 5 mph WNW | 0% |
| Tuesday Night | 37°F | Partly Cloudy | 0 to 5 mph NNW | 0% |
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 Nov 4, 2026.