Jackson Demonstration State Forest, State forest in Mendocino County, United States.

Jackson Demonstration State Forest is a public forest of 197 km2 (76 sq mi) in Mendocino County, along State Highway 20 between Willits and Fort Bragg. Coast redwood is the most common tree, alongside Douglas fir, grand fir, hemlock, bishop pine, tanoak, alder, madrone and bay myrtle. Elevation runs from 80 to 2,200 feet (24 to 671 m).

The forest was established in 1949 after the state purchased the land from Caspar Lumber Company, which had managed it since 1862. Since its creation, it has served as a model for sustainable forestry practices and responsible land management.

The land holds sacred meaning for the Coyote Valley Band of Pomo Indians, who have deep ancestral ties to these forests. As you walk through the trails, you can sense the cultural layers embedded in this landscape.

Visitors can enjoy a range of activities including hiking, mountain biking, and horseback riding with well-marked trails for different skill levels. If you plan to collect mushrooms or gather firewood, you will need to obtain permits in advance.

The forest is home to the Caspar Creek Experimental Watershed Study, which has been conducting research since 1961 on how forest management affects water systems. This long-term study provides valuable scientific insights into forest ecosystems and how they respond to different management approaches.