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Trione-Annadel State Park - Big Loop

 37 votes


16.6 Miles 26.8 Kilometers




1,945' 593 m


-1,958' -597 m



Avg Grade (3°)


Max Grade (11°)

1,438' 438 m


333' 102 m



Bad / Closed 54 days ago
Half of Annadel is closed, presumedly because of fire. History

Getting forecast...

A good mix of technical singletrack and fire roads make for a fun 15-mile route.

Philip McAllister


The big loop around the state park - featuring highly technical singletrack up the Cobblestone trail, and a blast heading down the swooping North and South Burma Trail. There are opportunities to get some air and breeze around the swooping corners.

There are plenty of options to take side loops or shorten up the ride as necessary.

Be careful fording the stream near Ledson March - the water can get quite deep depending on when you are there. Protect that iPhone!
Dogs: No Dogs

Need to Know

Be prepared to get off and push heading up Cobblestone Trail - it's at least a black diamond - possibly double black.


From the parking lot, head up Cobblestone Trail. It's hard going on the uphill. Brutal in fact. Expect to get off and push unless you're top notch at navigating rock (or small boulder) gardens.

From the top of Cobblestone, link up with Rough Trail and follow that through the rocky meadows with the stunted trees down to Lake Illsanjo. The trail should widen up to fire road / semi-paved trail.

Head up the hill through a couple of rough spots and then take the branch to the right, heading up Canyon Trail before heading down Marsh trail to the left. You should be in the shade of trees for most of Marsh trail. Eventually ridge trail will veer off to the right and you can follow that for a little over three miles before meeting up with the fire road on the South side of Ledson Marsh. Head right and you can take a short 1.3 mile loop around Ridge Trail/ Pig Flat Trail - nothing special really though.

Once you meet back up with Ridge Trail by the picnic tables at Ledson marsh, head right and continue to follow the fire road around the marsh to the restrooms (ford the stream just before the restrooms). Be careful here - the stream can be deep.

From the restrooms, follow the singletrack up to the left. You'll be back in the sun now. There are great views overlooking the marsh to the left too. Once you hit the T, follow South Burma Trail to the right and enjoy the swooping downhills beneath the trees again. This is the highlight of the ride for me.

At some point you'll hit fire road - head right and keep going until you meet up with North Burma Trail. Belt down North Burma - there are some technical bits on the downhill, and a couple of rock gardens. If it's later in the day, watch out for hikers too... You'll meet up with Channel trail - head left and and follow the road back, eventually dropping onto the road and following that to the parking lot.


Land Manager: California State Parks

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Dec 10, 2017
Simon Hobbs
Dec 10, 2017
Erik Reindl
Oct 26, 2017
Christopher Stanley
Park closed until further notice due to fire damage and assessment needs. Trione Annadel website: . (volunteer application)
Oct 7, 2017
Sam Sagario
Aug 9, 2017
Mickey Fimbres
for some reason I missed South Berma and rode down Marsh. I had to turn around and go back up Marsh. Again. 17.5mi
Jul 27, 2017
armando tiscareno
Cobblestone Trail was definitely tough. I walked several of the rock gardens. Overall a fun trail.
Jul 10, 2017
Dave Reed
Toasty day but lots of good shaded goodness and well dried out trails — 5h 00m
Jun 24, 2017
Jonathan Moreno

Trail Ratings

  4.3 from 37 votes


  4.3 from 37 votes
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in California


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Keep your eye peeled for fellow cyclists in Annadel Mountain Bike Group (AMBG) jerseys and CA State Parks Volunteer Bike Patrol jerseys -- great helpful, knowledgeable people out there enjoying the park respectfully (they have maps!). AMBG has meet-up rides weekly. Thank them all for supporting the park. Apr 28, 2016

Too bad you left out of the funner descents in the park. Aug 30, 2016
Annadel is a MTB play ground. With all of the rock gardens it's pedal strike galore. Some of the local riders I met on the trail suggested this route the opposite direction. Riding up North Burma is easier than up Cobblestone, and Marsh, but then you'd miss flowing down N Burma, and that was a lot of fun. There's no water anywhere so if you're going in a warm month pack plenty. May 18, 2017

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