Gunsight Pass

Overview

Gunsight Pass Trail is Glacier’s big-mountain classic: a roughly 19–20 mile point-to-point that threads two high passes (Gunsight and Lincoln), strings together glacier-fed lakes, and finishes near Lake McDonald. Expect sweeping U-shaped valleys, waterfalls, and knife-edged ridges shaped by ancient ice. It’s doable in a very long day for the fit and prepared, but it really shines as a 2–3 day backpack so you can linger at the lakes and stroll the passes in good weather windows.

Route & Scenery

Most hikers start at Jackson Glacier Overlook on the east side, climb past Gunsight Lake to crest Gunsight Pass, drop to the sapphire bowl of Lake Ellen Wilson, then climb again to Lincoln Pass before descending to the Sperry area and out to Lake McDonald. The scenery is nonstop: glacial basins, waterfalls, and views toward storied ice like Blackfoot/Jackson. Side detours include Deadwood Falls and other short falls near the east end; strong legs can tack on Comeau Pass above Sperry for glacier views.

Difficulty & Who It’s For

This is a demanding alpine traverse with around 3,700 feet of cumulative gain (more if you add side trips). Experienced hikers sometimes push it in a day; many prefer a backpack with nights at Gunsight Lake and/or Lake Ellen Wilson or a reserved bunk at Sperry Chalet. Expect over 10 hours on trail if you’re doing the full traverse in a single push.

Season & Conditions

Prime window is late July through early September. Snow can linger on the pass approaches well into summer; early-season crossings may involve steep snowfields that feel serious without traction and self-arrest skills. Weather flips fast—bluebird mornings can turn to afternoon thunderstorms—so start early and carry layers and a rain shell.

Wildlife

This corridor is classic habitat for mountain goats and moose, and both black and grizzly bears roam the area. Make noise in brushy sections, keep plenty of space from wildlife, carry bear spray, and store food properly at designated backcountry sites.

Logistics

Both ends of the route connect to the Going-to-the-Sun Road, so shuttling is straightforward when buses are running. A common strategy is to stage a car near Lake McDonald and ride the shuttle to the east-side start, so your vehicle is waiting at the finish. Cell service is spotty to non-existent—download offline maps and carry a paper backup.

Camps, Chalet, and Permits

Backcountry campgrounds along the way (like Gunsight Lake, Lake Ellen Wilson, and Sperry) are permit-only with tight quotas. Overnight permits are limited, with some released via advance reservations and some held for walk-up. Sperry Chalet is a coveted on-route bed if you booked in advance.

Toilets & Water

Expect simple pit/box latrines only at backcountry campgrounds; otherwise, there are no facilities between camps. Seasonal bridges and camp openings can affect access—check current status before you go. Water is abundant but treat it.

Best Time to Visit

Aim for mid–late August for the highest probability of clear passes and stable footing. Start at first light to beat afternoon storms and to have time for photo/meal breaks, especially if you’re targeting dinner at the chalet. Weekdays are a touch quieter; the early morning east-to-west light is lovely on Gunsight Lake and the first pass.