Green Mountain and Onahu Creek Loop

You can start this loop from either the Green Mountain Trailhead or the Onahu Creek Trailhead. Both trailheads offer parking, but spaces can fill up quickly, especially during peak season. Rocky Mountain National Park also operates a shuttle service that may provide access to these trailheads; it's advisable to check the park's official website for current shuttle schedules and routes.

The best time to hike this loop is generally from late spring through early fall. Summer offers lush meadows and warmer temperatures, while fall brings beautiful aspen colors. Be aware that portions near Big Meadows can be marshy in the spring due to snowmelt. Winter hiking is possible but requires appropriate gear and knowledge of snow conditions.

No, dogs are generally not permitted on hiking trails within Rocky Mountain National Park, including the Green Mountain and Onahu Creek Loop. This regulation helps protect wildlife and preserve the natural environment. Service animals are an exception to this rule.

Yes, since this trail is located within Rocky Mountain National Park, you will need to pay the park's entrance fee. During peak season, a timed entry permit may also be required to access the park. It's essential to check the official Rocky Mountain National Park website for the most current information on fees and permit requirements before your visit.

The loop offers diverse terrain. You'll hike through dense conifer forests, expansive montane meadows like Big Meadows, and along the picturesque Onahu Creek drainage. There are steady climbs, gentler grades, and some sections with rises and falls. Expect some smooth, wide paths, but also a talus (rock) field and potentially marshy areas near Big Meadows in spring. A portion also passes through a burn scar area.

Big Meadows is a prime location for wildlife viewing, where you might spot deer, elk, and moose, especially during early morning or late evening. Bears are also known to be in the area, so carrying bear spray is advisable. Keep an eye out for various bird species and smaller mammals throughout the forest sections.

Yes, the trail passes by the remnants of old homesteader cabins from the early 1900s, including the Sam Stone Ranch Ruins, offering a glimpse into the area's past. You'll also traverse Big Meadows, the largest montane meadow in Rocky Mountain National Park, providing open vistas of surrounding peaks.

Yes, both the Green Mountain and Tonahutu Creek Trails, which form part of this loop, are sections of the Continental Divide National Scenic Trail. The route also passes through sections of the CDT - Colorado Section and the Continental Divide National Scenic Trail - Rocky Mtn Park.

While generally considered moderate, the loop's length (over 7 miles) and elevation gain (around 1100-1300 feet) can make it strenuous for beginners or very young children. It's best suited for hikers with some experience and good physical conditioning. The Onahu Creek section is noted as one of the best low elevation trails in the park, which might be a good starting point for less experienced hikers if doing an out-and-back.

Given the trail's length and varied terrain, you should pack plenty of water, snacks, and layers of clothing suitable for changing mountain weather. Bear spray is recommended due to potential wildlife encounters. A map and compass or GPS device are also wise, along with sturdy hiking boots. Don't forget sun protection and insect repellent.

Yes, there are several backcountry campsites available along the loop, such as the Green Mountain Backcountry Campsite and multiple Onahu Creek campsites. These offer opportunities for overnight adventures, but a wilderness permit is required from Rocky Mountain National Park for all backcountry camping.