Roscoe, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Roscoe, a village in Winnebago County, Illinois.
Today
84°F
Mostly Sunny
Mostly sunny, with a high near 84. South southwest wind 5 to 10 mph, with gusts as high as 20 mph.
7-day forecast for Roscoe
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Mostly Sunny | 5 to 10 mph SSW | 8% |
| Tonight | 64°F | Chance Showers And Thunderstorms | 0 to 5 mph WSW | 74% |
| Wednesday | 76°F | Showers And Thunderstorms Likely | 0 to 5 mph W | 74% |
| Wednesday Night | 58°F | Showers And Thunderstorms Likely | 0 to 5 mph NW | 63% |
| Thursday | 78°F | Chance Rain Showers then Partly Sunny | 0 to 5 mph NE | 30% |
| Thursday Night | 57°F | Mostly Clear | 0 to 5 mph NE | 11% |
| Friday | 81°F | Mostly Sunny | 0 to 5 mph S | 4% |
| Friday Night | 60°F | Mostly Clear | 0 to 5 mph SSW | 5% |
| Saturday | 83°F | Mostly Sunny | 0 to 10 mph SSW | 10% |
| Saturday Night | 66°F | Slight Chance Showers And Thunderstorms | 5 to 10 mph SSW | 23% |
| Sunday | 85°F | Slight Chance Showers And Thunderstorms | 5 to 15 mph SW | 23% |
| Sunday Night | 66°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 5 to 10 mph SSW | 44% |
| Monday | 84°F | Chance Rain Showers | 5 to 10 mph SSW | 43% |
| Monday Night | 66°F | Chance Showers And Thunderstorms | 5 to 10 mph WNW | 44% |
Forecast source: National Weather Service (api.weather.gov) for Roscoe (42.426, -89.009). Updated through the day.
Growing snapshot for Roscoe
Last spring frost
May 1
First fall frost
Oct 12
Growing season
162 days
Hardiness zone
5b
More local growing data for Roscoe: nearby ZIP 61073 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Cherry Valley
Durand
Loves Park
Machesney Park
New Milford
Pecatonica
Rockford
Rockton
South Beloit
Westlake Village
Winnebago
Climate data from the nearest NOAA station, Beloit, Wi (5.9 mi from Roscoe). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.