Rainbow Lake Trail

Rainbow Lake Trail in Whistler is one of those hikes that feels bigger than the stats suggest. Officially it’s about 16 km return with around 925 m of gain, but most hikers’ GPS watches are calling it closer to 19–22 km, so plan for a solid full-day out-and-back. It’s rated challenging for good reason: long, steady climbing, real elevation, and alpine weather that can flip from warm at the trailhead to cold and windy at Rainbow Lake itself.

The Rainbow Lake Trail starts with a punchy climb past Rainbow Falls, then settles into a well-built forest trail with bridges, creeks, and a mix of steeper sections and flatter breaks. The route is clearly marked every half kilometre, with multiple outhouses and flowing water sources along the way. Up high, the forest opens into meadows, boardwalks, and finally the lake, where on a clear day you get big mountain views, wildflowers in late July–August, and the option to wander around to the far side or continue toward Hanging Lake, Ninja Lakes, or Rainbow Pass for wider alpine views.

Right now, expect a maintained, easy-to-follow trail but treat this as a long mountain hike, not a casual stroll. Allow 5–7 hours depending on pace and photo stops, bring layers for cold wind and possible patches of snow near the top, and carry a filter for the many streams. Bugs can be brutal at the lakes in midsummer, and this is active black and grizzly bear country, with fresh scat and regular sightings reported, so carry bear spray, make noise, and check for any Rainbow Lake Trail or Rainbow–Sproatt alpine closures before you go. No dogs are allowed past the watershed boundary, and the main hiking season here in Whistler runs roughly July through October.