Mountain Biking in Humboldt County: The Arcata Community Forest and Its Trails

Mountain biking in Humboldt County centers on the Arcata Community Forest — a 2,134-acre city-managed second-growth redwood forest on the hills east of Arcata containing approximately 22 miles of designated mountain bike trail. The forest is open year-round, charges no admission fee, and is administered by the City of Arcata Forestry Division under a management plan that explicitly accommodates mountain biking alongside hiking, trail running, and watershed stewardship. The trail network runs from beginner-accessible forest road loops to technical singletrack through dense understory, with elevation gain beginning immediately at the Redwood Park trailhead. Lady Humboldt considers it one of the more consequential pieces of outdoor infrastructure in the county's public land portfolio, in a county not short of consequential public land.

The Arcata Community Forest occupies the hills immediately east of Arcata, reachable by bicycle from the city center via residential streets in under fifteen minutes. The forest's trail network is organized around a spine of wide, graded forest roads branching into a system of singletrack routes that descend and climb through second-growth coast redwood, Douglas fir, and the vine maple and sword fern understory that characterizes the coastal ranges of Humboldt County in fall and winter.

The primary trailhead sits at Redwood Park on the forest's western edge, where the City of Arcata maintains a parking area, restrooms, a trail kiosk with current maps, and a rhododendron garden that performs its best work in spring and keeps its own counsel the rest of the year. A second trailhead accesses the forest from the north via Fickle Hill Road; a third entry point connects from the Cal Poly Humboldt campus to the south, well-used by students who have determined that the forest constitutes an acceptable alternative to other midday activities.

The singletrack routes in the upper forest vary in character from rolling doubletrack connectors to technical descents with rooted surfaces, embedded rock, and sight lines shortened by the understory. The forest floor stays wet from October through April, which means clay-heavy sections develop ruts and soft patches after sustained rain. The City of Arcata Forestry Division closes specific routes during wet conditions to prevent trail damage — closures posted at the kiosk and online. Riders who ignore these closures contribute to maintenance backlogs that affect everyone who uses the network, a consideration Lady Humboldt finds persuasive.

The forest's most-used circuit for mountain bikers combines the West Ridge Trail to the upper road network, a traverse to the eastern drainage, and a descent back toward Redwood Park — a loop of approximately 5–7 miles depending on connector choices, with 600–800 feet of cumulative elevation. More experienced riders extend this circuit into the upper reaches of the forest, where trails become less traveled and the likelihood of sharing the route with a dog walker diminishes considerably.

On October 8, 2026, the Arcata City Council voted unanimously to pursue designation as an IMBA Trail Town — a recognition program administered by the International Mountain Bicycling Association identifying communities that have developed a trail network, visitor infrastructure, and local business ecosystem sufficient to support destination mountain biking. The vote authorized city staff to begin the formal application process, a development Lady Humboldt notes with appropriate interest, given that Arcata is not a city historically associated with restraint in unanimous votes.

IMBA Trail Town status requires a documented network of at least 20 miles of maintained singletrack — which the Arcata Community Forest's current 22-mile network satisfies — combined with accessible trailhead infrastructure, nearby lodging and services, and organized trail stewardship. The City of Arcata's existing forestry management structure provides the institutional backbone for the application; the Cal Poly Humboldt mountain biking community provides a consistent volunteer labor pool for trail maintenance days; and the network of cafes, bike shops, and brew pubs within a ten-minute ride of the Redwood Park trailhead provides what Visit Humboldt describes as the surrounding economic ecosystem.

Whether the designation is granted in 2027 or later, the council vote signals a formal commitment to developing the Community Forest as a regional mountain biking destination rather than managing bike use as incidental to the forest's primary functions. The implications for trail investment, signage, and infrastructure maintenance are consequential for riders who use the network currently and those who may use it in future years. Lady Humboldt observes that Arcata has been running its own arrangements for several decades and does not typically announce intentions it does not pursue.

On October 16, 2026, a paved multi-use connector known as the Annie and Mary Trail opened in Arcata, linking the city's urban core to the trailhead network feeding the Community Forest. The trail takes its name from the Annie and Mary Railroad, a narrow-gauge logging railroad that operated in the Mad River Valley in the early twentieth century — a provenance Lady Humboldt finds more distinguished than most trail names in the county.

The paved connector provides a car-free route from Arcata neighborhoods to the forest access points, closing a gap in the trail network that previously required riders to navigate surface streets and one traffic-heavy intersection near the Cal Poly Humboldt campus. The practical consequence is that riders based in central or north Arcata can now reach the Redwood Park trailhead entirely off-road from several residential starting points. This improves the forest's accessibility for commuters using mountain bikes as transit as much as it improves it for recreational riders, a dual function that Lady Humboldt considers a sign of mature trail planning.

The connector is paved, bidirectional, and open to bicycles, pedestrians, and mobility devices. It is not a singletrack experience; its function is to make the singletrack experience more accessible, which is a different and arguably more useful thing.

The McKay Community Bike Park is currently under construction adjacent to the Community Forest network in Arcata, designed to provide a skills-focused complement to the forest's trail system. Lady Humboldt has no opening date to report; the City of Arcata Forestry Division is the authoritative source for current construction status and expected completion. Completion will add progressive skills features — pump track, flow lines, and technical skills areas — to a network that currently serves experienced riders well but offers limited structured progression for riders building technical ability from beginner or intermediate foundations.

The bike park design is intended to address a gap common in community forests built primarily around trail hiking: the absence of low-consequence terrain where riders can practice specific skills without committing to a full trail descent. When complete, the park will serve the youth mountain biking programs active at Cal Poly Humboldt and in Arcata's secondary schools, which have expanded their enrollment as the forest's trail network has grown. Lady Humboldt notes this fact without claiming to understand why more young people choose to ride bicycles through steep, root-covered terrain than to pursue more sedentary activities, but does not consider the trend alarming.

Humboldt County's coastal climate produces a trail season that runs counter to most of California's mountain biking calendar. The coast redwood forest receives most of its precipitation between October and April. Trail surfaces in the Community Forest respond accordingly.

The October–November window — when Lady Humboldt is writing — delivers conditions that are not as photogenic as August but are, in their own terms, excellent: the canopy has thinned enough for light to reach the trail surface, bigleaf maple adds brief color to the understory, and trail traffic is lower than in summer months. Riders who are comfortable with wet surfaces and the occasional soft section find October among the more agreeable months the forest offers. November is wetter, and the Forestry Division's closure notifications become worth checking before leaving the parking area.

Visitors arriving without a mountain bike have two rental options in Arcata that Lady Humboldt is aware of: Life Cycle Bike Shop on G Street in central Arcata and Revolution Bicycle Repair on the Arcata Plaza. Both shops rent hardtail mountain bikes and carry a selection of replacement parts and trail supplies. Neither operates on a walk-in appointment model during the fall season; calling ahead is advisable, as is noting that a 29-inch hardtail in a specific size may or may not be available on a given weekend. Those who have strong preferences about suspension travel and wheel diameter should communicate these in advance or bring their own equipment, which in Lady Humboldt's observation is generally the wiser arrangement.

Both shops also maintain working knowledge of current trail conditions and closures — an informal intelligence channel that is often more current than the posted kiosk signage, particularly in the 48 hours following a significant rain event. Asking the mechanic about the upper singletrack before loading the bike onto the rack is, Lady Humboldt suspects, one of the better two-minute investments available to a visiting rider.

The Arcata Community Forest presents no navigation challenge comparable to the county's wilderness routes, but several logistical points apply throughout the year:

• Trail map: The City of Arcata Forestry Division publishes a current trail map at the Redwood Park kiosk and on the City of Arcata website. Printed maps sold at bike shops reflect an earlier version of the network and may not show recent singletrack additions. The digital version is updated more frequently.
• Helmet: Required under California law for riders under 18; common sense for everyone else given that the technical singletrack routes include rock features and rooted surfaces at speed. Lady Humboldt does not legislate personal risk tolerance but notes this without apology.
• Water: No potable water is available in the forest interior. Two liters is the standard recommendation for a 5–7 mile loop; more for extended routes or warm summer days.
• Flat repair kit: Thorns from blackberry and thistle growing along the trail margins cause pinch flats. A tube, tire lever, and CO₂ inflator add negligible weight and eliminate the experience of walking 2 miles out of a redwood forest in cycling shoes.
• Lights: November's short days mean sunset at approximately 5:15 PM. Riders starting after 3 PM should carry lights. The forest road network is navigable in low light; the singletrack is not.
• Closed trail protocol: Posted closures during wet conditions are not suggestions. The clay-heavy sections of the upper forest can be destroyed by tire passage within hours of saturation. The trail volunteer community that maintains these routes is not compensated for remediation work caused by closed-trail riding.

The Redwood Park trailhead is located at the east end of Union Street in Arcata, approximately 1.2 miles from the Arcata Plaza. GPS systems recognize the address as 1098 Union Street, Arcata, CA 95521. Parking is free; the lot accommodates passenger vehicles, pickup trucks, and the occasional SUV with a roof-mounted bike rack without requiring creative maneuvering. The trail guide lists the Arcata Community Forest among the county's hiking trails, with trailhead coordinates and current seasonal notes.

Riders staying in Eureka or McKinleyville can reach the trailhead via U.S. 101 north to the Arcata exit and east on Samoa Boulevard or Valley East Boulevard — approximately 10 miles from central Eureka. Riders based in Arcata can reach the trailhead by bicycle using the Annie and Mary Trail connector, which is the approach Lady Humboldt considers appropriate given the nature of the activity.