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Trione-Annadel State Park

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An Overview of Trione-Annadel State Park

Situated 60 miles north of San Francisco, in the heart of Santa Rosa, California, Trione-Annadel State Park boasts a sprawling 5,092 acres of captivating natural beauty. The park extends into the town, connecting to neighborhoods and other parks, hence offering a convenient location for outdoor activities. Its landscapes are a blend of hilly, partly forested wild areas, and extensive trails, providing breathtaking views and unique recreational opportunities.

Trione-Annadel State Park, also known as Annadel State Park, holds significant historical relevance. It served as a trading site for the Wappo and Pomo people and later became significant in cobblestone mining in the early 1900s. Its rock formations, having volcanic origins, add to the park's unique appeal. The park also stands out for its preservation of northern oak groves, testifying its commitment to maintaining the area's natural heritage.

Key Amenities found in Trione-Annadel State Park

  • Hiking and Mountain Biking Trails: The scenic park offers numerous trails for hiking, running, and mountain biking, catering to different skill levels. These trails provide opportunities for outdoor fitness while immersing visitors in the park's natural beauty.
  • Lake Ilsanjo: This man-made reservoir is a central feature of the park, offering opportunities for swimming, boating, and fishing. It is also surrounded by wildflowers, particularly in April and May, enhancing its scenic charm.
  • Birding Opportunities: Trione-Annadel State Park is a haven for bird watchers, offering opportunities to observe various bird species in their natural habitat.
  • Horseback Riding: The park's trails are not limited to hikers and cyclists but also cater to horseback riders, making it a diverse recreational destination.

What You Will See When You Visit Trione-Annadel State Park

  • Breathtaking Landscapes: Trione-Annadel State Park offers extensive hilly, partly forested areas that are an aesthetic delight. These include beautiful rock formations with volcanic origins, adding an intriguing geological aspect to your visit.
  • Wildflowers: The park is renowned for its wildflowers, best seen from April to May. The area around Lake Ilsanjo, in particular, offers a vibrant display of diverse flower species.
  • Wildlife: Amid the park's serene settings, visitors can observe a variety of wildlife species, adding an element of excitement to the experience.
  • Historical Sites: The park's historical significance as a trading site for the Wappo and Pomo people is evident in certain areas. These sites provide visitors with a glimpse into the area's rich history.

Why You Should Visit Trione-Annadel State Park

Trione-Annadel State Park is a must-visit destination for nature enthusiasts and adventure seekers. Its diverse landscapes offer an array of outdoor activities that cater to diverse interests, from hiking and biking to bird watching and horseback riding. The park's natural beauty, amplified by its wildflowers and wildlife, ensures a captivating experience for all visitors.

Moreover, the park serves as a living museum of the region's cultural and geological history. Its historical and geological sites provide an educational dimension to your visit, making it not just a recreational retreat but also a fascinating learning experience. It's the perfect spot to enjoy a day outdoors, whether you're seeking physical activities, peace, or a combination of both.

Frequently Asked Questions About Trione-Annadel State Park

  • Are dogs allowed in the park?

Dogs are allowed in developed areas like Channel Drive but are prohibited on trails, dirt roads, or in the backcountry.

  • What is the best time to see the wildflowers?

The best viewing months for wildflowers are April and May, particularly around Lake Ilsanjo.

  • What are the park's operating hours?

The park hours are from 8:00 AM to sunset.


Trione-Annadel State Park is a remarkable gem in California's Sonoma Valley, offering unique recreational opportunities amid a rich natural and historical backdrop. It's a destination that promises to deliver a memorable experience, whether you're seeking an adventure-filled day or a tranquil retreat.

As you plan your visit to the park, remember that mishaps can occur at any time. MVP Accident Attorneys stand ready to assist you should you need legal support in case of a personal injury incident.

Trione-Annadel State Park Address: 6201 Channel Dr, Santa Rosa, CA 95409, United States, and stay safe!


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Brett Sachs

Brett S. Sachs graduated from Michigan State University College of Law with Cum Laude Honors. While attending Michigan State, Brett was awarded for his service in the Michigan State University College of Law Civil Rights Clinic, where he represented prisoners of the Michigan Department of Corrections from injustices brought upon them. Learn more.

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