Trip
Bobcats trip – Twin Sisters TH - Twin Sisters and South Sister
A hike to the East and West Twin Sisters peaks, then a side trip out and back to South Sister. There is a trail to the west summit. The out and back to the east summit and on to the south summit will be off-trail and has some Class 2+ scrambling.
- Wed, May 20, 2026
- Bobcats Section
- Hiking
- Adults
- Difficult
- Mileage: 9.1 mi
- Elevation Gain: 3,300 ft
- High Point Elevation: 11,428 ft
- Pace: 1.8 - 2.0 avg moving speed
- FULL, 4 on waitlist (9 capacity)
- Cancellation & Refund Policy
This is an out and back hike, mostly on a well-established trail. There is a trail to the west summit. The out and back to the east summit and then on to the south summit will be off-trail. There is some rock hopping and Class 2+ scrambling to get to the east summit, which is the highest summit on Twin Sisters Peak, as well as on the off-trail section over to the South Sister.
This link is for the AllTrails posting for the trip to East and West Twin Sisters Peaks: https://www.alltrails.com/explore/trail/us/colorado/twin-sisters-peak-trail
Meet in the Safeway parking lot at 3325 28th Street in Boulder at 6:30am so we can form carpools and leave no later than 6:40am. Specifically, park in the north end of the Safeway parking lot, near the Phillips 66 gas station. Here’s a Google Maps link to the Safeway: https://maps.app.goo.gl/mpG84vtWp2eCEGxU8
An alternate meeting location for those living further north is to meet at Sandstone Park in Lyons, parking on the Railroad Avenue side (south side) of the park, at 7:00am. Here’s a Google Maps link to the Lyons meeting place: https://maps.app.goo.gl/s5CfGVLuKXDVLWCa7
The Twin Sisters Peak trailhead is on the Peak-to-Peak Hwy south of Estes Park, directly across CO-7 from the Lily Lake Trailhead. Here’s a Google Maps Link to it: https://maps.app.goo.gl/WrKrzMDBo8TtVFWj6
Required Equipment
This is a CMC Bobcats Trip. The Bobcats’ mission is to ensure a variety of adventurous CMC trips, mostly on weekdays, all year long. Our trips tend to be faster paced, on more challenging routes, and with fewer stops. We foster a strong community of hikers seeking challenges, discovery, and camaraderie. We don’t have dues and we invite ALL CMC members to sign up for any Bobcat trip that is within their ability level.
Be sure to bring the 10 essentials