Turner Lake Fen Nature Preserve covers more than 900 acres in Spring Grove, Illinois, offering residents direct access to 5.5 miles of maintained trails that wind through fen wetlands, oak savannas, and open prairie. The preserve features two lakes—Turner and Sun—for non-motorized boating and fishing, along with a canoe launch and shoreline access points. Two picnic shelters with tables and grills sit near the parking area, and restrooms are available year-round. A boardwalk extends over sensitive wetland areas, providing elevated views of native sedges and wildflowers. The preserve lies less than two miles from U.S. Route 12, placing grocery stores, restaurants, and the Spring Grove Metra station within a ten-minute drive. Seasonal hunting is permitted in designated zones under state regulations, and the site is managed by the McHenry County Conservation District, which maintains maps and trail updates on its website.