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Status unknown — verify before visiting

We don't have current condition data for this trail. Check with the land manager before you go.

Henninger Loop via Idlehour and Sam Merrill Trail
ExpertLoop

Henninger Loop via Idlehour and Sam Merrill Trail

Altadena, California

15.9 mi

Distance

9,701 ft

Elev. Gain

7h 42m

Est. Time

Loop

Route Type

Expert

Difficulty

About This Trail

Imported description
Visitors can start at the gate. There is an opening for hikers to enter the trail. There is limited parking at the site. Please be respectful of your neighbors.

Trail Conditions

Trail Conditions

Unknown

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

Min:392 ft
Max:1,383 ft
2,957 ft
2,957 ft
392 ft722 ft1,053 ft1,383 ft0.0 mi4.0 mi8.0 mi11.9 mi15.9 mi

Trail Details

Route Type
Loop
Surface
Dirt

Official sources & verification

We don't have curated agency sources for this trail in our cache yet. Outdoors is not the permitting authority — confirm conditions, permits, and access with the managing agency before you go. If you know who manages this trail, please tell us.

Reviews

No reviews yet

Be the first to share your experience and help others plan their visit.

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.

Hunt context

This trail crosses hunting units

During hunting seasons, wear blaze orange and check regulations — see the California hunting page

Spot an error in our data on Henninger Loop via Idlehour and Sam Merrill Trail?