The Sonoma County Trails Challenge is an invitation to discover your Regional Parks.
Each summer, you're invited to hike, run, bike or ride at least five trails featured in the annual Trails Challenge guidebook and get a Trails Challenge T-shirt when you finish.
A new guidebook is usually published in late spring and includes park notes, trail descriptions, turn-by-turn directions, maps, and themed hikes.
Although the Trails Challenge runs in the summer only, you're invited to download the most-recent guidebook anytime and use it as a year-round hiking resource.
Download the 2019 Trails Challenge guidebook.
(PDF: 4.82 MB)
Thank you to the Trails Challenge sponsors.