There are a few classic day hikes in Glacier National Park and Siyeh Pass is definitely high on that list. You start out at the Piegan Pass trailhead. After spending a mile or so in the trees, you leave the Piegan Pass trail for the Siyeh Pass trail and break out into Preston Park. Hit it at the right time and you’ll be spoiled by meadows of alpine flowers in addition to the towering peaks and alpine firs. Keep a watch out for grizzlies in this area!
You then leave the green behind you and head up to the rocky pass and have a brief look into the untrailed Boulder Creek valley at the Pass and then look into the Baring Creek drainage down to St. Mary. Here, you’ll get to see the back side of Going-to-the-Sun Mountain and Matahpi Peak and the Sexton Glacier that they protect. At the pass, you’ve got a good chance of seeing some goats and/or sheep, so keep your eyes peeled.
Numerous little creeks and waterfalls from the glacier and snowfields above come together to form Baring Creek which tumbles in little waterfalls and pools all the way down into the unique feature known as Sunrift Gorge and the end of a long, but rewarding journey.
One last note is that this isn’t for the faint of knees. Since you start at a high elevation and gain even more to Siyeh Pass, you have well over 3,000 feet to descend.