Trip
Hiking – RMNP - Twin Sisters TH
Standard route to West Sister, optional East and South Sister for those with requisite scrambling skills/experience. Inclement weather modifies route.
Contacts
- Sun, Jun 14, 2026
- Boulder
- Hiking
- Adults
- Challenging
- Mileage: 8.7 mi
- Elevation Gain: 3,000 ft
- Pace: 1.8 - 2.0 1,250'/hr
- 9 (10 capacity)
- 1 (2 capacity)
- Cancellation & Refund Policy
We will follow the well established trail to West Summit. East and South summit has some 2+ scrambling. Those not comfortable with this can wait in the sun and enjoy the view and have the group in sight. If the rock is wet, we will not attempt this section.
Please be self-aware before registering. Climbing >1,250'/hour is difficult for some.
Current forecast has potential showers. We will hike in showers/light rain and avoid exposure as necessary. Will make weather decisions on Saturday if necessary, including changing destination to another area nearby - we will hike somewhere ;)
6:30a Departure Four Mile Canyon Creek Trailhead
6:50a Sandstone Park in Lyons
7:45a Twin Sisters Peak Trailhead
Please advise me which carpool you plan to be in. As CMC representatives, let's not take all the parking at the trailhead. Meet there only if you are not transiting Boulder or Lyons enroute.
Required Equipment
Ten Essentials
Can be wet and windy, so bring appropriate layers and if you might be waiting for others to scramble, some extra warm layers as well.