The Great Redwood Trail is a proposed multi-use rail-to-trail project connecting San Francisco and Humboldt bays in Northern California.

[4] Situated in Marin, Sonoma, Mendocino, Trinity, and Humboldt Counties, the route passes through the cities of Novato, Petaluma, Rohnert Park, Santa Rosa, Windsor, Healdsburg, Cloverdale, Ukiah, Willits, Fortuna, Rio Dell, Eureka, Arcata, and Blue Lake.

[5]: 4  The first completed segment of the trail was celebrated by State Senator Mike McGuire in Ukiah in February 2020.

[9] The trail will pass through the Eel River Canyon Preserve which includes the Grand Canyon of the Wild and Scenic Eel River, home to dozens of endangered species and rare wildlife.

[10][11] The trail alignment through the Eel River will be challenging due to erosive geology and some failing infrastructure, including tunnels, bridges, and trestles.