Campgrounds and RV parks near Belvidere, IL

Late May through early October is the prime window for an RV rental in Belvidere, with daytime highs typically in the upper 60s to mid 80s Fahrenheit and nearby campgrounds like Rock Cut State Park fully operational, including the Olson Lake swim beach from Memorial Day through Labor Day. June tends to be the wettest month, so July through September often delivers the most reliable sunshine for lake days and grilling at the campsite. Late September into early October is a local favorite, with fall colors across Boone and Winnebago Counties, cooler 60 degree afternoons ideal for hiking, and quieter campgrounds. Book your Belvidere RV trip early for fall weekends, since sites and rentals fill quickly.