South of Eureka near Weott, the Humboldt Redwoods State Park has over 52,000 acres, including over 17,000 acres of ancient old-growth coast redwood forest. It has the largest remaining contiguous old-growth coast redwood forest in the world. The trees here are thousands of years old and have never been logged. This forest is as pristine now as it was 100 years ago. Mountain bikes are restricted to the many forest service roads.
The park is located 45 miles south of Eureka along the Avenue of the Giants and 20 miles north of Garberville.
Overall, Humboldt Redwoods State Park is the 89th most popular mountain bike trail of all 132 mountain biking rides in California.