Forest Knolls is a rural, unincorporated community west of Woodacre, and east of Lagunitas. Today it is a census-designated place, together with Lagunitas. The 2010 Census names the place Lagunitas-Forest Knolls, with a total area of 4.2 square miles and a population of 1,800. This area is in the western side of the San Geronimo Valley, extending from the heavily forested ridges to the south and extending into the grassier northern slopes. Adjacent to Samuel P. Taylor State Park, the area includes some very large trees including Redwoods. Hiking, mountain biking, and horseback riding are popular in the hills above the towns.
It has some history in beer and "micro-brew," with the Lagunitas Brewery being founded in 1993 by Tony Magee in Lagunitas. The business succeeded and needed more space, moving a year later just north to Petaluma.. Since the mid-2000s, Lagunitas has been one of the fastest-growing craft breweries in the United States. They are now co-owned by M
San Geronimo Creek (a.k.a. Paper Mill Creek) runs through both towns, which is one of few remaining spawning grounds for Coho Salmon. The Lagunitas Creek Watershed is home to the largest-remaining wild run of coho salmon (Oncorhynchus kisutch) in Central California. These coho are part of the "Central California Coast Evolutionarily Significant Unit," or CCC ESU, and are listed as "endangered" at both the state and federal level. Lagunitas is on the eastern border of Samuel P. Taylor State Park.