Deer Grove, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Deer Grove, a village in Whiteside County, Illinois.
Today
87°F
Mostly Sunny
Mostly sunny, with a high near 87. Southwest wind 5 to 10 mph.
7-day forecast for Deer Grove
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 87°F | Mostly Sunny | 5 to 10 mph SW | 2% |
| Tonight | 67°F | Showers And Thunderstorms Likely | 5 mph SW | 71% |
| Wednesday | 78°F | Showers And Thunderstorms then Chance Showers And Thunderstorms | 5 mph W | 79% |
| Wednesday Night | 63°F | Showers And Thunderstorms | 0 to 5 mph N | 83% |
| Thursday | 79°F | Chance Rain Showers then Slight Chance Showers And Thunderstorms | 0 to 5 mph NE | 51% |
| Thursday Night | 61°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 0 to 5 mph E | 17% |
| Friday | 81°F | Mostly Sunny | 0 to 5 mph SE | 5% |
| Friday Night | 64°F | Mostly Clear | 0 to 5 mph S | 8% |
| Saturday | 85°F | Sunny | 5 to 10 mph SW | 9% |
| Saturday Night | 70°F | Mostly Clear then Slight Chance Showers And Thunderstorms | 5 to 10 mph S | 17% |
| Sunday | 86°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 10 to 15 mph SW | 17% |
| Sunday Night | 69°F | Chance Showers And Thunderstorms | 5 to 10 mph S | 35% |
| Monday | 86°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 5 to 10 mph S | 35% |
| Monday Night | 70°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 5 to 10 mph SW | 38% |
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 Aug 4, 2026.