Avenue of the Giants: Humboldt Redwoods State Park Guide

The Avenue of the Giants is a 32-mile alternate route to U.S. 101 running through Humboldt Redwoods State Park in the South Fork Eel River valley, between the unincorporated community of Phillipsville to the south and the Pepperwood interchange to the north. The road was once the primary coastal highway; when U.S. 101 was shifted inland, this stretch of old pavement was absorbed into the park and left in the company of the trees it had always served. It now carries visitors, cyclists, and the occasional undeterred RV through the largest concentration of old-growth coast redwood forest remaining in the world — a distinction the park holds without advertisement.

Humboldt Redwoods State Park covers approximately 53,000 acres in the South Fork Eel River watershed, roughly 45 miles south of Eureka via U.S. 101. Of that total, approximately 17,000 acres remain in old-growth condition — coast redwood forest (Sequoia sempervirens) that has never been logged, in a county where timber harvest defined the regional economy for most of the twentieth century. The park is administered by California State Parks in partnership with Save the Redwoods League, which was founded in 1918 specifically in response to the pace of harvest in this watershed.

Rockefeller Forest occupies the Bull Creek watershed, reached via Mattole Road heading west from the Avenue near Weott. It constitutes approximately 10,000 acres of contiguous old-growth coast redwood — the largest such block in the world, according to California Department of Parks and Recreation (2025). The forest grows on the Bull Creek alluvial flat, a broad river terrace where centuries of periodic flooding have deposited deep, well-drained soils of the particular quality that coast redwoods appear to prefer, without apparent negotiation on the subject.

The dominant trees of the alluvial flat stand between 200 and 370 feet in height with base circumferences exceeding 40 feet. The Giant Tree, located approximately 1.5 miles up the Bull Creek Flats Trail from the Rockefeller Loop parking area, measured 363 feet tall and approximately 53,000 cubic feet in volume as of the most recent survey (California State Parks, 2024), placing it among the largest coast redwoods by volume on record. Lady Humboldt notes that no photograph has yet resolved the problem of conveying this measurement accurately, and that this is not the photograph's fault.

The forest was secured for public ownership largely through a donation of $2 million from John D. Rockefeller Jr. in 1930, enabling Save the Redwoods League to acquire the Bull Creek watershed before it reached the saw. The forest bears his name; the trees, which had been present for between 500 and 2,000 years before the transaction, retain no record of the arrangement.

The Avenue of the Giants passes through or adjacent to a series of named groves, interpretive stops, and day-use areas. The following table lists the primary stops from the northern terminus at Pepperwood southward to Phillipsville, with approximate distances and current features.

Stop	Miles from Pepperwood	Features
Pepperwood Grove	0	Northern terminus; short accessible old-growth loop (0.3 mi); day-use area
Percy French Memorial Grove	3.8	Roadside grove; Eel River access; picnic area
Drury-Chaney Loop Trailhead	8.1	2.5-mile loop gaining ridge elevation; old-growth to second-growth transition
Founders Grove	9.6	1.5-mile nature loop; Dyerville Giant site; South Fork Eel River access
Humboldt Redwoods Visitor Center (Burlington)	10.2	Maps, trail conditions, exhibits, interpretive staff; open daily year-round
Rockefeller Loop Trailhead	12.7	1-mile old-growth flat loop; access to Bull Creek Flats Trail toward Giant Tree
Giant Tree / Bull Creek Flats	14.2	Largest-volume trees; Bull Creek swimming; alluvial flat ecology
Albee Creek Campground	17.5	Campground with redwood understory sites; first-come, first-served
Myers Flat / Shrine Drive-Thru Tree	23.4	Commercial site; operational year-round; gift shop
Phillipsville	32.0	Southern terminus; rejoins U.S. 101 southbound

The visitor center at Burlington is operated jointly by California State Parks and Save the Redwoods League and represents the appropriate first stop for any visit longer than an hour. Staff maintain current trail condition reports, post road closure notices after storm events, and carry interpretive materials on the old-growth ecosystem and the park's acquisition history. The newsletter archive holds field notes from past visits to the Avenue during different seasonal conditions, for those who prefer a correspondent's account to an interpretive panel.

The park maintains approximately 100 miles of trail ranging from short accessible nature loops to multi-day backcountry routes through the Bull Creek drainage and the Grasshopper Peak ridge. The table below summarizes the trails most commonly used by day visitors, with distances and difficulty ratings from California State Parks (2025).

Trail	Distance	Difficulty	Key Features
Rockefeller Loop	1.0 mi	Easy	Old-growth alluvial flat; Bull Creek views; the most efficient introduction to the forest's scale
Big Trees Loop	0.7 mi	Easy	Short loop at Founders Grove; accessible for most visitors; interpretive signage
Founders Grove Nature Loop	1.5 mi	Easy	Dyerville Giant fallen trunk; South Fork Eel access; old-growth understory
Bull Creek Flats Trail	9.4 mi RT	Moderate	Alluvial flat corridor; Giant Tree at ~1.5 mi; largest-volume specimens; Bull Creek swimming
Drury-Chaney Loop	2.5 mi	Moderate	Elevation gain to ridge; old-growth to second-growth transition; views into Bull Creek watershed
Williams Ridge Trail	4.8 mi	Moderate	Ridge traverse; old-growth and prairie openings; connects to park backcountry
Grasshopper Peak Trail	9.6 mi RT	Strenuous	Park highpoint at 3,379 ft; panoramic ridgeline views on clear days; sustained elevation gain

The Bull Creek Flats Trail is the park's central hiking spine. It follows Bull Creek upstream from the Rockefeller Loop parking area through the heart of the old-growth flat, passing the Giant Tree and several other trees of note at distances manageable as a half-day outing. The creek also serves as the forest's secondary water source during the dry season — fog drip from the canopy constitutes the primary dry-season input — and Bull Creek's swimming holes are among the more sought-after features of a summer visit, when valley temperatures reach the 90s and the water does not. The hike directory lists additional trails in the park with current seasonal status.

Founders Grove takes its name from the founders of Save the Redwoods League — Henry Fairfield Osborn, John C. Merriam, and Madison Grant — who dedicated this stand in 1921, three years after the organization's founding. The grove contains examples of old-growth coast redwood in the 1,000-to-1,800-year age range and runs along a 1.5-mile self-guided nature loop with interpretive markers identifying individual trees by circumference, height, and estimated age. The South Fork Eel River forms the grove's eastern boundary; a short spur trail descends to the river bar.

The most remarked-upon feature of Founders Grove is one no longer present. The Dyerville Giant stood in this grove until March 24, 1991, when a series of winter storms raised the South Fork Eel to flood stage, eroding the root mass on which the tree had depended for between 1,000 and 1,800 years. The tree fell during the early morning hours; its collapse was heard clearly in Weott, approximately two miles east. Its measured height before falling was 362 feet — briefly the tallest known living tree on record before taller specimens were identified in the interior forest. The fallen trunk remains at the grove, decomposing at the pace that coast redwood logs maintain — slowly, and in a manner of considerable consequence to the soil fungi, invertebrates, and understory plants that depend on downed wood as habitat and substrate. An interpretive marker at the fallen log notes the date and the circumstances with appropriate economy.

The same flood history that ended the Dyerville Giant severely damaged the surrounding grove and road network through the park on multiple occasions, most significantly during the flood of December 1964, which raised the South Fork Eel 36 feet above its normal channel and destroyed most of the town of Weott. California State Parks and Save the Redwoods League conducted a multi-year restoration of the Bull Creek watershed following that event; the current condition of the alluvial flat represents both the resilience of the forest and the sustained effort of that recovery, as is its custom.

The Avenue of the Giants in summer operates in a weather pattern distinctly different from the immediate Humboldt coast. Marine fog, which persists at sea level through much of the morning along the oceanfront, typically moves inland and dissipates by midday in the South Fork Eel River valley. Afternoon temperatures in Weott and Myers Flat regularly reach 80 to 90 degrees Fahrenheit during heat events; inside the old-growth forest, canopy shade and the creek's cooling influence reduce temperatures substantially — though the drive between the highway and the trailheads crosses open valley floor that does not share the grove's microclimate.

Season	Avenue / Valley	Rockefeller Forest / Bull Creek	Notes
Spring (Mar–May)	Cool and wet; South Fork Eel elevated; possible road closures after storm events	Bull Creek elevated; Giant Tree trail may be partially waterlogged through April	Trillium and redwood sorrel in understory bloom; light visitor numbers; rhododendrons at ridge elevation through May
Summer (Jun–Aug)	Valley heat 80–95°F by afternoon; fog dissipates by midday; peak visitor season	Forest cooler than valley by 10–20°F; Bull Creek swimming at its annual best	Burlington Campground fills on weekends; early arrival (before 9 AM) reduces roadway congestion substantially
Fall (Sep–Nov)	Cooling rapidly; first rains arrive October; shorter daylight shortens effective hiking window	Chanterelle season in surrounding mixed-conifer forest begins October; creek levels rising by November	Chinook salmon return to South Fork Eel (October–November); the seasonal wildlife guide covers the run calendar
Winter (Dec–Feb)	South Fork Eel subject to significant flooding; road closures on the Avenue and Mattole Road possible	Bull Creek Flats Trail may be submerged or impassable after major storm events	Check California State Parks website for current closure status before driving in winter

The park posts current road and trail conditions at the Burlington visitor center and on the California State Parks website. The South Fork Eel River floods with genuine severity in significant rain years — the river's history warrants taking closure advisories at face value rather than as a suggestion. The events calendar notes any ranger-led programs timed to current grove conditions.

The Avenue passes through or adjacent to a series of small communities — Weott, Myers Flat, Miranda, and Phillipsville — that occupy the narrow alluvial valley between the park boundary and the river. These settlements exist at elevations and in orientations that the South Fork Eel's flood history has periodically made instructive. Weott was essentially destroyed by the 1964 flood and rebuilt on higher ground; the town's current modest footprint reflects the recalibration that followed.

The river itself offers what Lady Humboldt considers a proper complement to the grove: swimming holes in Bull Creek and along accessible stretches of the South Fork Eel are cold, clear, and substantially uncrowded relative to comparable coastal alternatives. The combination of old-growth forest in the morning and cold-water river access in the afternoon constitutes one of the more defensible summer day-itineraries available in Humboldt County without an overnight stay — particularly given that summer afternoons in the valley, unlike those at the coast, provide the heat that makes cold water worthwhile.

The towns along the Avenue maintain a functional economy of small groceries, gas stations, and lodges serving through-travelers and overnight visitors. The commercial drive-through tree in Myers Flat — a redwood bored through in the 1930s for the entertainment of motor tourists — operates year-round and constitutes its own category of experience, distinct from the old-growth itself and not incompatible with it. Lady Humboldt declines to recommend it with any particular enthusiasm while acknowledging that the majority of its visitors appear to leave satisfied, which is more than can be said for some activities of greater cultural ambition.

The Avenue of the Giants is accessed from U.S. 101 at two clearly marked interchanges: the Pepperwood exit (Exit 663) at the northern end and the Phillipsville exit (Exit 641) at the southern end. The highway exits are approximately 45 miles south of Eureka and 200 miles north of San Francisco. From Eureka, the drive to the Burlington visitor center takes approximately 50 minutes under normal traffic conditions. From San Francisco, the drive is approximately 3.5 hours via U.S. 101 — a route that itself passes through Richardson Grove State Park south of Garberville, providing an additional old-growth corridor as a preview of what the Avenue offers at larger scale.

Commercial vehicles over 35 feet are restricted from the Avenue and directed onto U.S. 101 instead — a regulation that preserves the road's character as a driving experience rather than a freight corridor, and that Lady Humboldt considers one of the more consequential decisions in the park's management history.

No day-use fee is charged at the Rockefeller Loop, Founders Grove, or Bull Creek Flats trailheads. The Burlington visitor center and most roadside turnouts along the Avenue are also free. Burlington Campground, adjacent to the visitor center, operates on a first-come, first-served basis; summer weekend sites fill by midday Friday. Albee Creek Campground, approximately five miles up Mattole Road from the Avenue, provides a quieter alternative with similar first-come access. Neither campground accepts advance reservations through ReserveCalifornia at this time, which Lady Humboldt notes as information worth confirming before the drive if an overnight stay is the plan.

Is the Avenue of the Giants the same road as U.S. 101?

No. The Avenue of the Giants is a parallel alternate route that runs through Humboldt Redwoods State Park, rejoining U.S. 101 at marked interchanges at each end. The road follows the original routing of the Redwood Highway before the main highway was shifted inland; it is accessed via Exit 663 at Pepperwood (northbound) or Exit 641 at Phillipsville (southbound). The Avenue carries no commercial truck traffic and no through-freight — conditions that preserve the road's character in a way that proximity to the highway does not.

How long does it take to see the Avenue properly?

The full 32-mile length can be driven in approximately one hour with no stops. A visit that includes Founders Grove, the Rockefeller Loop, and the visitor center at Burlington requires three to four hours at a considered pace. A full day — Founders Grove, the Bull Creek Flats Trail to the Giant Tree, a stop at the river, and time at the visitor center — occupies six to seven hours comfortably. These facts may be related to one another in the sense that the park expands to fill whatever time is allocated, and contracts accordingly when it is not.

What is the difference between Humboldt Redwoods State Park and Redwood National and State Parks?

Humboldt Redwoods State Park is a California State Parks property centered on the South Fork Eel River valley, approximately 45 miles south of Eureka. The Avenue of the Giants runs through it. Redwood National and State Parks is a distinct complex of NPS and California State Parks lands located further north, between Orick and Crescent City, encompassing Prairie Creek Redwoods, Del Norte Coast Redwoods, and Jedediah Smith Redwoods. The Fern Canyon and Prairie Creek guide covers the northern park complex in detail. Both contain old-growth coast redwood; both are worth the separate trip.

When do salmon return to the South Fork Eel River?

Chinook salmon typically begin returning to the South Fork Eel River in October, with the run peaking in November depending on rainfall and river conditions. Coho salmon use the river system as well, with a somewhat later and more variable window. The salmon return coincides with the first significant fall rains, which raise the river from its summer low and open migration corridors that have been blocked for months. The seasonal wildlife guide covers the full salmon run calendar for Humboldt County rivers, including the South Fork Eel and the Eel River mainstem.

Lady Humboldt's weekly field guide arrives Tuesday mornings with trail conditions, river notes, and field observations from the Avenue of the Giants and the broader North Coast. A subscription is here — it costs nothing and arrives without ceremony.