Larch season in Kananaskis -- Ptarmigan Cirque and Arethusa Cirque
Subalpine larch needles go gold for roughly three weeks a year, and in Kananaskis that window runs from about the fourth week of September into the first week of October. Ptarmigan Cirque is a short loop starting at Highwood Pass, the highest paved trailhead in Canada, so you begin near treeline instead of grinding up to it. Arethusa Cirque across the highway is flatter, shorter and busier. Both are half-day walks, not summit days.
Subalpine larch needles go gold for roughly three weeks a year, and in Kananaskis that window runs from about the fourth week of September into the first week of October. Ptarmigan Cirque is a short loop starting at Highwood Pass, the highest paved trailhead in Canada, so you begin near treeline instead of grinding up to it. Arethusa Cirque across the highway is flatter, shorter and busier. Both are half-day walks, not summit days.
- + The gold window is only about three weeks in the entire year
- + Highwood Pass trailhead means you start near treeline, minimal climbing
- + Both loops are half-day, mixed-fitness friendly
- + Two very different cirques within a few minutes of each other
- − Peak-weekend parking restrictions apply -- check Alberta Parks before driving out
- − Snow can land on any late-September weekend up there
- − Peak colour shifts a week either direction with the weather
- Cost band
- free to hike; parking pass rules apply in K-Country
- Timing tip
- Go midweek or be at the pass before 8 am -- weekend lots fill and get restricted.
- Verified on
- 17 Aug 2026
- Booking needed
- no
- Indoor outdoor
- outdoor
- Why this month
- Subalpine larches only turn for about three weeks, late September into early October, then drop their needles.