By Shuttle
Starting around Memorial Day Weekend and going through the end of September, Rocky Mountain National Park operates a free shuttle bus service which enables you to access many destination and loop hikes along Bear Lake Road, including Sprague Lake and Glacier Gorge to cut down on traffic congestion and limited parking. Shuttle buses run between many trailheads, Moraine Park Visitor Center, and Moraine Park and Glacier Basin Campgrounds.
There are two routes: The Bear Lake Route and the Moraine Park Route. Both routes are based at the Park & Ride shuttle bus parking area across from the Glacier Basin Campground. The first bus departs from Park & Ride at 7PM. and the last bus leaves at 7PM. The last bus of the day leaves Bear Lake and Fern Lake Trailheads at 7:30PM. The Bear Lake Route shuttle makes the round trip between the Park & Ride and Bear Lake. These buses run every 10 to 15 minutes. The Moraine Park Route shuttle makes the round trip between the Park & Ride and the Fern Lake Trailhead bus stop. These buses run every 30 minutes.
By car
Most of the major trailheads in the park are accessible by car and have parking lots depending on the popularity of the route. While parking is relatively ample in the early mornings, many lots are full by mid-morning during the peak summer months. The Trail Ridge Road and Old Fall River Roads are closed during the winter and usually don't reopen till late spring at the earliest. Access to Moraine Park and Bear Lake via the Bear Lake Road are open year-round and plowed.
There are several entrances to the park which do not have fees on the east side of the park:
Longs Peak Ranger Station road dead ends at the Longs Peak Ranger Station and trailhead
McGraw Ranch road dead ends at McGraw Ranch and Cow Creek trailhead
Lily Lake Visitors Center parking lot (on the right side of SR-7 heading south from Estes Park
McGregor Ranch Gem Lake entrance parking lots near Lumpy Ridge trailhead
By bike
Cycling through the park offers riders a chance to take in some of the scenery and striking vistas at a casual pace; however, some may be daunted by the high altitudes and steep climbs on the main roads. Elevations range from 8,000 feet to 12,183 feet 2,400 to 3,700 m. There are 60 miles 97 km of hard-surfaced road with a five to seven percent grade. Most of the roads in the park have little to no shoulder, with the added challenge of dealing with heavy summer traffic. Early mornings or late evening rides may minimize conflict with other vehicles. Be vigilant for thunderstorms in the early to late afternoons, where lightning can create a serious hazard.
Winter cyclists will have access to Upper Beaver Meadows Road, Moraine Park Campground, Endovalley Road, Aspenglen Campground and High Drive. For a unique cycling experience, check with the park information office for specifics on the Old Fall River Road gravel surface and Trail Ridge Road paved, which are open to bicycles early in the summer season, before they open to vehicles.
Off-road mountain biking is prohibited inside the park.