Trip
Day Hike - Cougar Mountain: Harvey Manning Trailhead
An easy after work hike to a big, REALLY big rock, the Fantastic Erratic. Hike on Cougar Mountain doing a loop from the Harvey Manning Trailhead to the Fantastic Erratic. Meeting time 4pm at the Harvey Manning Trailhead.
- Wed, Apr 22, 2026
- Foothills Hiking Committee
- Day Hiking
- All Who Qualify, Adults
- Easy, Easy
- Easy
- Mileage: 3.0 mi
- Elevation Gain: 600 ft
- High Point Elevation: 1,430 ft
- Pace: 1.5 - 2.0 mph
- FULL (6 capacity)
- FULL (2 capacity)
- Thu, Mar 26, 2026 at 9:00 AM
- Mon, Apr 20, 2026 at 5:00 PM
- Cancellation & Refund Policy
- iCal Google
This is a mentored hike with a new hike leader. We'll stay together taking breaks as needed. We will take a couple of trails to a spur to the Fantastic Erratic where we'll take a brief break and then loop back on different trails. The steepest section is the spur to the Erratic, a drop and return climb of about 200 ft in .5 miles. We'll plan to be back at the trailhead by 6:30pm but adjust as needed. Sunset will be about 8pm. Trails are on the Green Trails Cougar Mountain. King County Parks also has a good map with all the Cougar Mountain trails. Sturdy water-proof footwear and trekking poles are recommended.
Meet at the Harvey Manning Trailhead at 4pm, boots on the ground at 4:15pm. On old maps it may be shown as the Anti Aircraft Peak Trailhead. No pass is required. You can use Google Maps for the Harvey Manning Trailhead.
Cougar Mountain: Harvey Manning Trailhead
-
Green Trails Cougar Mtn No. 203S
see Land Manager - See full route/place details.
Required Equipment
- Navigation
- Headlamp
- Sun protection
- First aid
- Knife
- Fire
- Shelter
- Extra food
- Extra water
- Extra clothes