Boulder Canyon Trail is located in beautiful Muncho Lake Provincial Park. The trailhead is approximately 7 kilometers past the MacDonald Campground when heading north along the Alaska Highway. Keep an eye out for a pullout/parking area on the east side of the highway; it is distinguished by large boulders outlining it.
There will be signage with trail information and mapping at the starting point. From here the trail heads east up a large alluvial fan toward the base of the mountain range paralleling the highway. About 600 meters from the start, the trail begins to enter a narrower section of the creek bed as it works its way into Boulder Canyon. Depending on the time of year there could be water flowing, which forms many small waterfalls as it descends out of the mountains. However, during the fall there is typically no water flowing out of Boulder Canyon.
Carrying on, the creek bed becomes increasingly narrow. Staying right as you progress up the valley will lead you to a well established trail above the canyon walls below. Caution is advised because footing can be loose through this section, and there is little in the way of handholds.
The trail eventually works back down to the creek bed, and more scrambling over boulders and rocky sections is required from this point. Before long the trail will split into two sections that lead further up the mountain slopes surrounding Boulder Canyon. Most people opt to turn around at this point; however, one could continue onward for a more elevated view of the area.
Be aware that water flows are unlikely in the fall, so plan accordingly. Also, keep an eye out for buffalo or mountain caribou near the trailhead.