North Fork Belly River Trail

Overview

If you crave quiet, the North Fork Belly River is your kind of Glacier hike. Starting at the Chief Mountain Customs trailhead, it drops quickly into the Belly River valley, then leaves the maintained corridor to pursue a faint, seldom-traveled path toward the North Fork near Sentinel Mountain. Plan on roughly 17.1 miles total (out-and-back) with about 3,400 feet of cumulative up/down. This is an unmaintained Class 3 route: the tread comes and goes, there’s a mandatory river ford, and you’ll be doing real navigation.

Route and What You’ll See

From the trailhead, descend about two miles to the valley floor. Around mile three, a subtle turn heads toward the river—this is where the character changes. You’ll ford the Belly River (save this hike for lower flows later in summer if you can), then wander through broad, wildlife-rich meadows where the “trail” is often just a hint. As you contour around the north ridge of Sentinel Mountain, intermittent views open across the North Fork Belly River drainage toward the surrounding peaks. Expect a mix of airy forest, open grass, and occasional creek crossings. There’s an old spur toward Miche Wabum Lake that’s essentially abandoned and choked in brush—skip it unless you’re looking for a bushwhack.

Difficulty and Who It’s For

This isn’t the polished, signed experience many expect in Glacier. It’s brushy in places, can be muddy, has downfall and washed-out segments, and requires a safe river ford. If you love solitude, route-finding, and don’t mind a bit of mystery under your feet, it’s fantastic. If you prefer a straightforward, maintained trail with big, sustained vistas, continue on the main Belly River corridor toward Elizabeth Lake instead—that’s the scenic crowd-pleaser without the ford and guesswork.

Nature Notes

The Belly River valley sits among some of the park’s oldest sedimentary rocks—ancient sandstones, shales, and limestones hardened over time into resistant quartzites, limestones, and argillites that shape the rugged skyline. Meadow sections are good for spotting large mammals, and the river-lake system supports native trout. Move calmly, carry bear spray, and give wildlife generous space.

Best Time to Hike

Early season access here is often better than high passes thanks to the lower elevation, but the ford and lingering wet/muddy tread can be deal-breakers. The sweet spot is later summer when water levels drop and bugs begin to fade. Not a winter objective; higher spots can hold snow well into the season. Start early for firm footing, cooler temps, and a full-day margin for route-finding.

Tips and Safety

• Bring and know how to use bear spray; travel in a group if possible.
• Expect the tread to vanish—carry offline maps and be comfortable navigating.
• Turn around if the Belly River is running high or pushy; a safe ford is non-negotiable.
• Mosquitoes can be fierce; long layers and repellent help.
• Overnight trips require a backcountry camping permit; day hikes do not. Pets aren’t allowed on park trails.