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Trione-Annadel State Park - Big Loop



16.7 mile 26.9 kilometer loop
70% Singletrack


Ascent: 1,830' 558 m
Descent: -1,839' -561 m
High: 1,436' 438 m
Low: 334' 102 m


Avg Grade: 4% (2°)
Max Grade: 25% (14°)


No Dogs
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A good mix of technical singletrack and fire roads make for a fun 15-mile route.

Philip McAllister

Electric Mountain Bikes Not Allowed

Features -none-


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!

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.

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We need help with the following missing trail information:

Family Friendly, ADA Accessible, Features, History & Background


Land Manager: California State Parks

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Feb 22, 2020
Nick Giorgi
Nov 16, 2019
Greg Fiske
Aug 25, 2019
Jon Heaton
Will not be doing again until I gain more experience. 17.8mi — 3h 00m
Jul 28, 2019
Michael Faris
Did the full loop, shredded on a hard-tail. Much climbing and fun downhill at the end. — 3h 30m
Jul 27, 2019
Wild good fun on the hard tail! 16.7mi — 3h 00m
Jun 1, 2019
cali grl
Should've skipped lawndale and schultz 22mi
May 20, 2019
Apr 20, 2019
Jason Fox

Trail Ratings

  4.3 from 49 votes


  4.3 from 49 votes
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in California


408 Views Last Month
44,708 Since Apr 3, 2013


Photos -Baby Jump-
Jun 6, 2018 near Roseland, CA
Jett Williams always has a great time.
Jan 20, 2017 near Kenwood, CA
Enjoying the shady and secluded singletrack at the southern edge of Annadel State Park.
Jul 19, 2013 near Kenwood, CA
Son's second time on a trail, first time at Annadel.
Feb 19, 2019 near Santa Rosa, CA
Cobblestone Trail
Jun 14, 2013 near Santa Rosa, CA
No warm up at Annadel. The climb starts immediately.
May 27, 2013 near Santa Rosa, CA

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