Rainbow Lake Trail

The Rainbow Lake Trail is an 8.5-mile out-and-back route. While the exact duration can vary based on your pace and how long you spend enjoying the lake, most hikers complete it in about 4-5 hours.

The trail begins in a mixed forest, initially wide enough for ATVs, but soon narrows into a well-maintained singletrack as it enters the Mount Zirkel Wilderness. You'll follow a ridgeline with increasingly better views, including the distant Rabbit Ears rock formation. Expect a distinct natural division with aspen trees to the south and conifers to the north. Around two miles in, there's an easy stream crossing, and the trail skirts the southern edge of Rainbow Lake itself.

This trail is generally considered intermediate. While it's rated moderate to easy for experienced hikers, it can be a good challenge for those less accustomed to elevation. Its average grade is 6%, with a significant elevation gain, so it might be challenging for very young children or absolute beginners.

The Rainbow Lake Trail #1130 begins in the Mount Zirkel Wilderness. Specific parking details are not provided in the source, but generally, wilderness trailheads have designated parking areas. Arriving early is often recommended, especially during peak season, to secure a spot.

While the source doesn't explicitly state dog regulations for this specific trail, trails within the Mount Zirkel Wilderness generally allow dogs, often requiring them to be on a leash. It's always best to check the latest regulations for the wilderness area before your visit.

Based on the trail description, August is a good time to visit, as stream crossings are easy to navigate and wildflowers are likely in bloom. The views of distant snow-capped peaks are fantastic, but be aware that the lake valley can be quite breezy. Late spring through early fall typically offers the most favorable conditions.

As this trail is located within the Mount Zirkel Wilderness, there are typically no entrance fees required for the wilderness area itself. However, some trailheads or specific activities might require permits. It's advisable to check with the local Forest Service office for any current permit requirements before your hike.

You'll experience a transition from a wider path to a singletrack trail upon entering the wilderness. Panoramic views along the ridgeline include the iconic Rabbit Ears formation. The trail also features a unique natural division of aspen and conifer forests. A highlight is Rainbow Lake itself, a spectacular destination, and the scenic Norris Creek waterfall located between Rainbow and Middle Rainbow Lake.

Yes, the route primarily follows the Rainbow Lakes Trail (100% of the route) and also passes through a section of the Grizzly-Helena Trail (15% of the route).

While specific wildlife sightings are not detailed for this particular Rainbow Lake Trail, the Mount Zirkel Wilderness is home to various species. Hikers should always be aware of their surroundings and practice Leave No Trace principles. Bear sightings are possible in wilderness areas, so carrying bear spray and knowing how to use it is recommended.

This is an 8.5-mile out-and-back trail, meaning you will return along the same path you took to reach Rainbow Lake.