Rock City, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Rock City, a village in Stephenson County, Illinois.
This Afternoon
69°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Partly sunny, with a high near 69. East wind around 15 mph. Chance of precipitation is 40%.
7-day forecast for Rock City
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 69°F | Chance Showers And Thunderstorms | 15 mph E | 44% |
| Tonight | 61°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 10 to 15 mph E | 83% |
| Saturday | 76°F | Showers And Thunderstorms | 5 to 10 mph SE | 93% |
| Saturday Night | 61°F | Showers And Thunderstorms | 5 to 10 mph N | 75% |
| Sunday | 67°F | Rain Showers Likely | 15 mph NE | 58% |
| Sunday Night | 54°F | Chance Rain Showers | 15 to 20 mph NE | 43% |
| Monday | 63°F | Chance Rain Showers | 15 to 20 mph NE | 42% |
| Monday Night | 49°F | Chance Rain Showers | 10 to 15 mph NE | 42% |
| Tuesday | 62°F | Chance Rain Showers | 15 mph NE | 31% |
| Tuesday Night | 47°F | Mostly Cloudy | 5 to 15 mph NE | 9% |
| Wednesday | 65°F | Mostly Sunny | 5 to 10 mph NE | 5% |
| Wednesday Night | 49°F | Partly Cloudy | 5 to 10 mph NE | 2% |
| Thursday | 67°F | Mostly Sunny | 5 mph NE | 5% |
| Thursday Night | 50°F | Partly Cloudy | 0 to 5 mph NE | 5% |
Forecast source: National Weather Service (api.weather.gov) for Rock City (42.413, -89.471). Updated through the day.
Growing snapshot for Rock City
Last spring frost
Apr 26
First fall frost
Oct 13
Growing season
169 days
Hardiness zone
5a
More local growing data for Rock City: nearby ZIP 61070 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Adeline
Cedarville
Dakota
Davis
Freeport
German Valley
Lake Summerset
Lena
Orangeville
Pearl City
Ridott
Willow Lake
Winslow
Climate data from the nearest NOAA station, Freeport Waste Wtp, Il (10.6 mi from Rock City). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 18, 2026.