COVID-19: At REI, we encourage you to get outside responsibly. Stay local, avoid recreational travel, practice social distancing and check ahead for area and facility closures. Learn More
Trail Run Project Logo

Rocky Ridge and Alpine Lake



4.9 mile 7.9 kilometer loop
87% Runnable


Ascent: 790' 241 m
Descent: -791' -241 m
High: 1,258' 383 m
Low: 657' 200 m


Avg Grade: 6% (4°)
Max Grade: 25% (14°)


Driving directions Take a virtual tour
Zoom in to see details
Map Key

Trail shared by Trail Run Project Staff

A path less traveled, this one rewards with diverse terrain and top-notch scenery.

Trail Run Project Staff

Features Birding · Lake · River/Creek · Views · Waterfall · Wildflowers · Wildlife


This route offers some good views, solitude, and takes the runner through a great cross-section of local flora. The first part is on a rocky fire road before you turn off onto a singletrack that travels through oak, manzanita, redwoods, lake-side scrub, and even marshes.

Need to Know

Be careful of your footing, and watch out for rattlesnakes!


To reach the start of the run, park at the dam and cross it. This route could be done in either direction, but I like having the climb at the beginning to get the heart rate up.

The first mile is a constant climb on Rocky Ridge Road. This road is aptly named with a lot of loose rock and ruts. Tread carefully. At Stocking Trail, turn right and follow the trail down through oaks and manzanita, past a marsh before intersecting the Kent Trail. Veer right and follow the Kent Trail through redwoods, past Hidden Lake, and through a tunnel of huckleberry bushes. At the right time of year (fall), there are delicious berries good for snacking on.

This long descent ends at the shores of Alpine Lake, where you'll turn right to continue on the Kent Trail and head along the shore of the lake. This trail can be a bit tricky footing-wise, so be careful. There are places where there has been some erosion and there are a lot of rocks and roots in the trail. Also beware of rattlesnakes!

On the day I was tracking this trail, I nearly stepped on one, jumping over it at the last minute. If I would have had my dog with me I think it would have been a bad deal. Another reason to always keep your dog on leash! This trail intersects the Kent Fire Road at the pump station where you'll run a gradual up hill section back to the start. Cross the dam to the parking for a nice cool-down.

Flora & Fauna

Look for ospreys, which are frequently seen at these lakes.

Run this trail?

We need help with the following missing trail information:

Runner Notes, History & Background

Is something wrong? Let us know. Have photos to share? Help fellow runners know what's here.


Rate This Run

Rate Quality

   Clear Rating

Rate Difficulty

Share This Run

Check In


Apr 20, 2019
Rosemary James

Trail Ratings

  3.7 from 3 votes


  3.7 from 3 votes
5 Star
4 Star
3 Star
2 Star
1 Star
Run Rankings


in California


64 Views Last Month
1,982 Since Aug 10, 2016



Mt Tam seen across Bon Tempe Lake
Aug 10, 2016 near Kentfield, CA
Coming down into a potential swimming hole!
Aug 10, 2016 near Kentfield, CA
Lake Alpine seen through the trees.
Aug 10, 2016 near Kentfield, CA
Cruising through the meadow, headed to the final stretch.
Aug 10, 2016 near Kentfield, CA
Looking SE from Rocky Ridge Fire Road
Aug 10, 2016 near Kentfield, CA
Huckleberry tunnel, heading down to the shore of Alpine Lake
Aug 10, 2016 near Kentfield, CA


Trail Run Project is part of the REI Co-op family,
where a life outdoors is a life well lived.

Shop REI Running