Rock City, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Rock City, a village in Stephenson County, Illinois.
Overnight
54°F
Chance Rain Showers
A chance of rain showers. Mostly cloudy. Low around 54, with temperatures rising to around 58 overnight. South wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 30%.
7-day forecast for Rock City
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 54°F | Chance Rain Showers | 15 mph S | 29% |
| Wednesday | 59°F | Chance Rain Showers then Mostly Cloudy | 15 to 20 mph SW | 41% |
| Wednesday Night | 45°F | Slight Chance Rain Showers | 15 mph SW | 24% |
| Thursday | 54°F | Chance Rain Showers | 10 to 15 mph W | 52% |
| Thursday Night | 38°F | Slight Chance Rain Showers then Mostly Cloudy | 10 to 15 mph N | 19% |
| Friday | 48°F | Partly Sunny | 10 to 15 mph N | 3% |
| Friday Night | 29°F | Partly Cloudy | 0 to 5 mph N | 0% |
| Saturday | 51°F | Sunny | 0 to 5 mph NW | 0% |
| Saturday Night | 32°F | Mostly Clear | 5 mph W | 1% |
| Sunday | 56°F | Sunny | 5 to 10 mph W | 6% |
| Sunday Night | 33°F | Mostly Clear | 5 to 10 mph W | 0% |
| Monday | 60°F | Sunny | 5 to 15 mph SW | 0% |
| Monday Night | 38°F | Mostly Clear | 5 to 10 mph W | 0% |
| Tuesday | 61°F | Sunny | 5 mph NW | 0% |
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 Nov 4, 2026.