Deer Grove, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Deer Grove, a village in Whiteside County, Illinois.
Overnight
53°F
Slight Chance Rain Showers
A slight chance of rain showers. Mostly cloudy. Low around 53, with temperatures rising to around 56 overnight. South wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.
7-day forecast for Deer Grove
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 53°F | Slight Chance Rain Showers | 10 mph S | 23% |
| Wednesday | 58°F | Chance Rain Showers | 15 mph SW | 33% |
| Wednesday Night | 46°F | Mostly Cloudy then Slight Chance Rain Showers | 10 to 15 mph SW | 15% |
| Thursday | 55°F | Chance Rain Showers | 10 to 15 mph W | 44% |
| Thursday Night | 41°F | Slight Chance Rain Showers then Mostly Cloudy | 5 to 10 mph NW | 21% |
| Friday | 50°F | Partly Sunny | 5 to 10 mph N | 4% |
| Friday Night | 31°F | Mostly Clear | 0 to 5 mph N | 0% |
| Saturday | 51°F | Sunny | 0 to 5 mph NW | 0% |
| Saturday Night | 33°F | Mostly Clear | 0 to 5 mph W | 2% |
| Sunday | 57°F | Sunny | 5 to 10 mph W | 3% |
| Sunday Night | 34°F | Clear | 0 to 5 mph W | 0% |
| Monday | 62°F | Sunny | 0 to 10 mph SW | 0% |
| Monday Night | 39°F | Mostly Clear | 5 mph W | 0% |
| Tuesday | 63°F | Sunny | 5 mph NW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Deer Grove (41.610, -89.687). Updated through the day.
Growing snapshot for Deer Grove
Last spring frost
Apr 24
First fall frost
Oct 14
Growing season
172 days
Hardiness zone
5b
More local growing data for Deer Grove: nearby ZIP 61243 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Walnut, Il (5.6 mi from Deer Grove). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.