Williams Peak Trail begins approximately 32 kilometres up Chilliwack Lake Road, where a signed left turn leads to a car-accessible trailhead.

The route follows an old logging road before climbing steeply up Williams Ridge, gaining roughly 900 metres of elevation to reach the ridgeline.

A first cabin marks about one-quarter of the way up, a makeshift teepee structure appears just past the halfway point, and a second cabin indicates roughly two-thirds of the climb is complete.

Once on the ridge, the trail heads eastward for approximately 3 kilometres toward the summit, with considerable undulation along the way. The total round-trip distance is about 15. 9 kilometres with 1,850 metres of vertical gain.

The final approach to the summit involves navigating a boulder field and a loose, steep gully leading into a south-facing grassy gully. Summit views are panoramic, taking in the full Chilliwack Lake area and surrounding peaks.

The route is considered a moderate scramble and is featured in Matt Gunn's Scrambles in SW British Columbia .