Rock Falls, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Rock Falls, a city in Whiteside County, Illinois.
This Afternoon
73°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms before 5pm. Partly sunny, with a high near 73. East wind around 10 mph. Chance of precipitation is 40%.
7-day forecast for Rock Falls
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 73°F | Chance Showers And Thunderstorms | 10 mph E | 43% |
| Tonight | 64°F | Mostly Cloudy then Chance Showers And Thunderstorms | 5 to 10 mph E | 49% |
| Saturday | 81°F | Showers And Thunderstorms | 5 to 10 mph S | 78% |
| Saturday Night | 63°F | Showers And Thunderstorms | 5 to 10 mph NW | 78% |
| Sunday | 71°F | Rain Showers | 10 to 15 mph NE | 78% |
| Sunday Night | 55°F | Rain Showers Likely | 10 to 15 mph NE | 62% |
| Monday | 66°F | Chance Rain Showers | 15 mph NE | 54% |
| Monday Night | 51°F | Chance Rain Showers | 10 to 15 mph NE | 40% |
| Tuesday | 64°F | Chance Rain Showers | 10 to 15 mph NE | 31% |
| Tuesday Night | 48°F | Mostly Cloudy | 5 to 10 mph NE | 6% |
| Wednesday | 68°F | Mostly Sunny | 5 to 10 mph NE | 3% |
| Wednesday Night | 50°F | Partly Cloudy | 0 to 5 mph NE | 3% |
| Thursday | 70°F | Mostly Sunny | 0 to 5 mph NE | 4% |
| Thursday Night | 52°F | Partly Cloudy | 0 to 5 mph NE | 5% |
Forecast source: National Weather Service (api.weather.gov) for Rock Falls (41.772, -89.694). Updated through the day.
Growing snapshot for Rock Falls
Last spring frost
Apr 21
First fall frost
Oct 19
Growing season
180 days
Hardiness zone
5b
More local growing data for Rock Falls: nearby ZIP 61071 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Dixon 1W, Il (12.2 mi from Rock Falls). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 18, 2026.