Camping at the Nevada County Fairgrounds March 14, 2017 | wendy Did you know the RV Park at the Nevada County Fairgrounds is open year-round? We are – and it’s absolutely beautiful out here in the spring. Photo by Suzy Calderon Crabtree. Categories: Nevada County Fairgrounds.Tags: events, Grass Valley, Lions Lake, Nevada City, Nevada County, RV, RV Campground, and RV Camping.