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Routes
Hikes
United States
California
Sonoma County

Trione-Annadel State Park

The best walks and hikes in Trione-Annadel State Park

4.8

(35)

804

hikers

18

hikes

Hiking trails in Trione-Annadel State Park traverse a diverse landscape of sprawling grasslands, dense chaparral, and significant oak woodlands. The park features hilly terrain, Douglas fir forests, and areas with volcanic rock formations. Central to the park is Lake Ilsanjo, a 26-acre man-made lake. The interconnected trail system offers options for both easy, relatively flat paths and more challenging routes with significant elevation gain.

Best hiking trails in Trione-Annadel State Park

  • The most popular hiking route is Canyon, Rough Go and Cobblestone Loop, a 7.6 miles (12.3 km) trail that takes 3 hours 26 minutes to complete. This moderate route combines varied terrain with views of the park's natural features.
  • Another top favourite among local hikers is Channel, North Burma, and Warren Richardson Loop, an easy 3.6 miles (5.7 km) path. This loop offers a less strenuous option through wooded areas.
  • Local hikers also love the Lawndale, Marsh, Pig Flat and Ridge Trail Loop, a 10.9 miles (17.6 km) trail leading through oak woodlands and marsh areas, often completed in about 4 hours 55 minutes.
  • Hiking in Trione-Annadel State Park is defined by oak woodlands, grasslands, and volcanic rock formations. The interconnected trail system offers options for both easy, relatively flat paths and more challenging routes with significant elevation gain.
  • The routes in Trione-Annadel State Park are highly rated by the komoot community with an average score of 4.9 stars from over 30 reviews. More than 600 hikers have used komoot to explore Trione-Annadel State Park's varied terrain.

Last updated: May 12, 2026

5

hikers

#1.

Channel, North Burma, and Warren Richardson Loop

11.8km

03:16

190m

210m

Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels.

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Moderate

Easy hike. Great for any fitness level. Easily-accessible paths. Suitable for all skill levels.

Easy
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Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels.

Moderate

Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels.

Moderate

2

hikers

Hard hike. Very good fitness required. Easily-accessible paths. Suitable for all skill levels.

Hard
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Popular around Trione-Annadel State Park

MTB Trails in Trione-Annadel State Park

Cycling in Trione-Annadel State Park

Road Cycling Routes in Trione-Annadel State Park

Running Trails in Trione-Annadel State Park

Tips from the Community

mtm05005
May 13, 2025, Ridge Trail

The Ridge Trail is a popular trail in Trione-Annadel State Park. The flowy single track follows a ridge as it leads you up some switchbacks.

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Trail around the southern perimeter of Annadel State Park to Bennet Mountain

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Within this park, there are extensive miles of trails available for hiking, biking, and horseback riding. The landscape comes alive with an array of wildflowers, particularly vibrant during spring. Notably, Lake Ilsanjo stands as a park highlight, offering opportunities for fishing and often attracting anglers.

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Sorcerer V
April 9, 2023, Ridge Trail

switchbacks need some consideration

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Short, useful connector trail

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Get off the wide forest road onto the quieter hiking trails

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Lake Ilsanjo is a hidden gem in Annadel State Park: it's a small, quiet lake. There are many trails and even some swimming spots.

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Warren Richardson is the main, gradual gravel-paved fire road to the Lake Ilsanjo saddle from the north side of the park. Very pleasant riding in the shade of tall pine and fir trees.

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Frequently Asked Questions

How many hiking trails are available in Trione-Annadel State Park?

Trione-Annadel State Park offers an extensive network of over 45 miles of trails. On komoot, you can find more than 70 hiking routes, ranging from easy strolls to more challenging treks.

What kind of terrain can I expect when hiking in Trione-Annadel State Park?

The park features diverse terrain, including sprawling grasslands, dense chaparral, and significant oak woodlands. You'll encounter hilly sections, Douglas fir forests, and areas with volcanic rock formations. Trails vary from relatively flat paths to routes with significant elevation gain, often winding through open grassy hillsides and wooded areas.

Are there easy hiking options for beginners or casual walkers?

Yes, Trione-Annadel State Park has several easy, relatively flat paths suitable for beginners. For example, the Channel Trail is known for its gentle terrain. Overall, komoot lists over 30 easy routes in the park, perfect for a relaxed walk.

Are there more challenging trails for experienced hikers?

Absolutely. The park's hilly terrain provides challenging routes for experienced hikers. Trails like Lawndale offer significant elevation gain, and the Rough Go Loop is known for its rocky terrain and steep climbs. One such challenging route is the Warren Richarson & Marsh Trail loop, which covers over 10 miles with substantial elevation.

What natural features or landmarks can I see along the trails?

Hikers can explore a variety of natural features. Central to the park is Lake Ilsanjo, a picturesque 26-acre man-made lake. You might also encounter volcanic rock formations, evidence of past cobblestone quarrying, and the seasonal Ledson Marsh, which is a haven for birdlife. The Canyon Trail and Warren Richardson Trail are popular for their scenic beauty.

When is the best time to see wildflowers in Trione-Annadel State Park?

Trione-Annadel State Park is renowned for its vibrant wildflower displays, especially in spring. While wildflowers can be spotted from January into September, the most magnificent displays typically occur in April and May. You'll find lupines, poppies, blue-eyed grass, and iris, particularly around Lake Ilsanjo.

Can I expect to see wildlife while hiking?

Yes, the diverse ecosystems of Trione-Annadel State Park support a variety of wildlife. You might spot black-tailed deer, western gray squirrels, coyotes, and raccoons. Occasional sightings of bobcats and mountain lions are also possible. Ledson Marsh is particularly good for birdwatching, hosting 130 different bird species.

Are there waterfalls or rushing creeks in the park?

During the rainy winter months, the park's beauty is enhanced by seasonal waterfalls and rushing creeks. These features add an extra dimension to the hiking experience, especially after significant rainfall.

Are there any circular hiking routes in Trione-Annadel State Park?

Yes, many trails in Trione-Annadel State Park are designed as loops, offering varied scenery without retracing your steps. Popular options include the Lake Ilsanjo via the Canyon Trail loop and the Lake Ilsanjo Loop, both offering beautiful lakeside views.

Is Trione-Annadel State Park dog-friendly?

While dogs are generally welcome in California State Parks, specific rules regarding trails can vary. It's always best to check the official park website for the most current regulations on where dogs are permitted, especially on hiking trails. You can find more information on the California State Parks website: parks.ca.gov.

What do other hikers enjoy the most about hiking in Trione-Annadel State Park?

The area is highly rated by the komoot community, with an average score of 4.8 stars from over 30 reviews. Hikers frequently praise the park's diverse landscapes, from oak woodlands to open grasslands, and the scenic beauty of Lake Ilsanjo. The extensive and well-maintained trail system, offering options for all skill levels, is also a common highlight.

Is there parking available at Trione-Annadel State Park?

Yes, parking is available at Trione-Annadel State Park. There are designated parking areas, typically near trailheads. Please be aware that a day-use fee may apply, and it's advisable to check the official park website for current parking information and fees before your visit.

Most popular routes in Trione-Annadel State Park

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