From online to printable PDF to hardcopy topo, there are many different kinds of maps available. Below are some links to sources that we've found helpful:
Look for the 3D icon on trail pages on this site to see trail maps in perspective with computer generated 3D views of the Bear Lake, Fern Lake, Longs Peak and Wild Basin areas of the Park. Get a feel for just how majestic these mountains are!
National Park Service
Rocky Mountain National Park - great zoom and detail. Printable on large paper.
Backcountry Camping in RMNP - shows designated backcountry sites and crosscountry areas.
Campground Maps for Moraine Park & Glacier Basin on Bear Lake Road, Aspenglen on Fall River Road, Longs Peak off Hwy 7 south of Estes Park, and Timber Creek on the West or Grand Lake side of the park.
Arapaho and Roosevelt National Forests and Pawnee National Grasslands - Visitor Guide, including maps
Rocky Mountain National Park - Terrain view and zoom. National Park Service map below shows more details.
Gateway town on the eastern side of the Park - Estes Park, Colorado
Gateway town on the western side of the Park - Grand Lake, Colorado
Printed Maps to Purchase
Trail Tracks - panoramic, illustrated map of Rocky Mountain National Park
National Geographic Outdoor Recreation Map - Trails Illustrated topographic map, waterproof and tear resistant