15.9 mi
Distance
9,701 ft
Elev. Gain
7h 42m
Est. Time
Loop
Route Type
Expert
Difficulty
About This Trail
Henninger Loop via Idlehour and Sam Merrill Trail is a loop trail in Los Angeles County, California. It is 16 miles long and gains 9,701 feet. It is in or next to Altadena, California.
From the trail data on this page.
Trail Conditions
Trail Conditions
We have no current condition data for this trail. Check with the operator before you go, and submit a report below if you've been recently.
No recent condition reports. Be the first to share what you see on the trail.
Elevation Profile
| Point | Distance from start | Elevation |
|---|---|---|
| Start | 0.0 mi | 409 ft |
| High point | 9.4 mi | 1,383 ft |
| End | 15.9 mi | 409 ft |
Trail Details
- Route Type
- Loop
Official sources & verification
Where it is
- Nearest town:
- Altadena, CA · in or next to town
- County:
- Los Angeles County, CA
Nearest town and county from U.S. Census Bureau place records and county boundaries.
Reviews
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Legacy import — verify before navigating
Path geometry came from our pre-launch legacy database. Routes have not yet been re-verified against the operator and may differ from the actual trail.
Mount Wilson Toll Road Climb
Idlehour Trail via Mount Wilson Trail
Eaton Canyon Falls from Pinecrest Drive
Mount Wilson Road, Idle Hour, and Mount Lowe Trail Loop
Henninger Flats Trail
Mount Wilson Loop
Stay nearby
Campgrounds near this trail
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