Route Details


The Tour of the Unknown Coast is sponsored in part by these fine Humboldt County businesses

Supporting Shops

Adventures Edge Bicycles
650 10 Th. St. Arcata, CA. 95521
Phone (707) 822-4673

Adventure's Edge
Eureka, 125 W. 5th St.
Phone: (707) 445-1711

Revolution Bicycle Repair
1360 G St. Arcata, CA 95521
Phone (707) 822-2562

Revolution Bicycle Repair Eureka
2811 F St. Eureka, CA. 95501 Phone (707) 443-9861

Sport & Cycle
475 N Fortuna Blvd, Fortuna, CA 95540 (707) 725-9405

Sport & Cycle
1621 Broadway St, Eureka, CA 95501 (707) 444-9274

100 Kilometer

Want more than 50 miles, but aren’t ready for the full 100-miler? Ride the new 100K (62 miles). It follows the same up & back route as the 50-miler, but continues on from the 50-mile turnaround with an added 6-mile out & back section of the beautiful Avenue of the Giants for a total of 62 miles.

Route Slip

  • Start/Finish Humboldt County Fairgrounds, Ferndale. Head west on 5th St. three blocks to Ocean Ave., turn left and head south out of town.
  • Mile 3.7 Waddington Rd. continue on through the Ferndale Bottoms toward Rio Dell on Grizzly Bluff Rd.
  • Mile 5.4 Grizzly Bluff School intersection, turn right to Rio Dell
  • Mile 8.3 Continue on toward Rio Dell.
  • Mile 13.1 Intersection –STOP SIGN!!!— Watch traffic control officer / CHP RIO DELL CHECK-POINT / AID STATION. Turn right onto Wildwood Ave., go through Rio Dell, cross the historic Scotia Bridge.
  • Mile 14.4 Continue through Scotia, the road turns to the left as you pass the lumber mill offices and the old locomotive. Continue on to Highway 101.
  • Mile 15.9 Enter Highway 101 southbound. SINGLE FILE PLEASE
  • Mile 21.7 Take Pepperwood exit from 101 south. Turn left at STOP SIGN and enter Avenue of the Giants south. Continue on next 8.2 miles.
  • Mile 25 Rest Stop / Aid Station at Immortal Tree Gift Shop
  • Mile 31 Turnaround at Dyerville Overlook. DO NOT CONTINUE ON UNDER HWY 101
  • Mile 36 Rest Stop / Aid Station at Immortal Tree Gift Shop
  • Mile 42 Turn right onto Highway 101 North. Stay Single File Please
  • Mile 48 Take first Rio Dell / Scotia exit right off Highway 101. Turn left at STOP SIGN and go under the freeway. Turn right at STOP SIGN and go back across Scotia Bridge.
  • Mile 48.5 Proceed through Rio Dell on Wildwood Ave. to Bellvue (Blue Slide Rd.)
  • Mile 50.3 Turn left heading back on Blue Slide Rd. to Grizzly Bluff Rd. back over the three hills and back to Ferndale. Single File Please
  • Mile 61.1 Turn right on 5th Street.
  • Mile 62 You’ve made it! Great job! You did it. See the finish line staff for your finishers patch.

100 K, 50 mile, and 20 mile maps