Harley-Davidson ride to Horse Mountain | Riding Humboldt County Posted on May 3, 2020May 3, 2020 by Biker Calendar April 30, 2020 Riding Humboldt County Visits: 94Share this:FacebookXLike this:Like Loading... Posted in 04-April, Arcata CA, Bike Rides, Blue Lake CA, Humboldt County, Humboldt County CA, Riding Humboldt County and tagged April, Bike Rides, Humboldt, Humboldt County, May, Riding Humboldt County, Videos.