Mills Lake Trail

Overview

Starts at Glacier Gorge Trailhead and climbs past Alberta Falls into the dramatic Glacier Gorge to Mills Lake, with direct views up to the Keyboard of the Winds and Longs Peak. The trailhead is also the start for Loch Vale and Sky Pond on longer days. The full route covers 5.3 miles round trip with about 750 feet of climbing, and most hikers finish it in around 3 hours. It sits in the Rocky Mountain National Park, near Estes Park in Larimer County, topping out at 9,940 feet.

Trail Highlights

How Hard Is It?

This is rated moderate. The long 5.3-mile distance paired with steady 750 feet of gain is what sets the effort level. You hike out to the turnaround and return the same way, so you see the route twice and can turn back early without missing the payoff. The elevation stays low enough that altitude is not a major factor for most hikers. If you hike regularly, plan for roughly 3 hours of moving time; add a buffer for photos, snack stops, and the slower pace at altitude.

Best Time to Hike

The best seasons here are summer and fall. Summer is the reliable window once the snow clears, though that also means the busiest trailheads and the daily afternoon thunderstorm risk. In Colorado the weather turns fast in the high country, so start early, aim to be heading down by early afternoon, and watch the sky. Lightning, not distance, is what turns most summer hikes around.

Getting to the Trailhead

The trailhead is in the Rocky Mountain National Park, closest to Estes Park (Larimer County). You need a National Park entrance pass, and many park trailheads also require a timed-entry reservation in peak season. Check the park website before you drive out. The parking coordinates are 40.3103, -105.6404; plug those into your map app rather than the trail name, since several Colorado trailheads share names. Mountain weather and road closures can change access, so confirm the access road is open before a long drive.

Dogs & Kids

Dogs are not allowed on this trail, which is common inside national parks and sensitive alpine areas. It is a tough one for young kids given the 5.3 miles and 750 feet of gain. Save it for older, trail-tested kids or go without them.

What to Pack

Pack the Colorado basics: more water than you expect, layers for a 30-degree temperature swing, sun protection for the high-altitude UV, and rain protection for the afternoon. For a long, steady hike like this one, the gear that earns its weight most is comfortable footwear and a solid shell. Here is what we actually recommend for trails like this:

• ›hiking boots with real traction
• ›a packable rain shell
• ›a water filter for the longer day

Frequently Asked Questions