LiDAR terrain view · USGS 3DEP
Aa Falls
By Armen Suny · Last verified Sep 2026
LiDAR & 3D terrainDifficulty
Moderate
Trail Length
2.4 miles
Trail Type
Out And Back
Elevation Gain
350 ft
About Aa Falls
Aa Falls is a lesser-known, secluded cascade tucked into the lush tropical landscape of Hawaii’s Kohala Forest Reserve. Managed by SDNR and designated as an SCA, the waterfall offers a peaceful setting framed by dense native vegetation and the kind of quiet you find off the beaten path. Specific details about the falls’ height are not well-documented, which adds to its low-key, exploratory appeal for hikers who prefer quieter sites over crowded lookouts. Access to the falls is via a moderate out-and-back hike through the forest reserve. The route and land stewardship fall under SDNR management, so visitors should observe posted rules and respect the protected area while enjoying the natural scenery. The trail’s moderate rating and forested approach make Aa Falls an appealing day trip for hikers looking for a green, restorative experience rather than a strenuous scramble.
The Setting
Aa Falls sits at 2,188 feet within Kohala Forest Reserve, fed by the Alakahi Stream, in the hills of Hawaii.
Trail & Hike Details
The Approach
The moderate 2.4-mile out-and-back trail gains 350 feet of elevation on the way to the falls.
Trail Description
Trail: out-and-back, 2.4 miles round-trip with approximately 350 feet of cumulative elevation gain; difficulty: moderate. The trail is located within the Kohala Forest Reserve (managed by SDNR, designated SCA). Detailed surface, grade, and technical trail class are not specified in the available management data, so expect a natural, unpaved forest route and come prepared with sturdy footwear, insect protection, and rain-ready clothing.
What to Expect
Visitors can expect a tranquil waterfall surrounded by lush greenery. The area may be remote and less crowded, offering a peaceful experience.
Accessibility
The trail is not wheelchair accessible. Uneven terrain and elevation changes require steady footing.
Frequently Asked Questions
🐶 Are Dogs Allowed at Aa Falls?
❌ Dogs are not allowed
Are There Any Fees or Permits Required?
🆖 No fees required
🏊 Is There Swimming at Aa Falls?
❌ Swimming is not allowed
When to Visit
The waterfall can typically be visited year-round, but weather conditions may vary. Dry seasons may offer easier access.
Seasonal Access
The best time to visit is Spring, Summer, Fall, and Winter. Heavy rains during wet season (November through March) bring higher flow but can make trails slippery.
Safety Information
Visitors should be cautious of slippery rocks, sudden weather changes, and potential flash floods. Always prioritize safety and avoid risky areas.
Current Water Conditions
3 ft³/s
Current discharge — how much water is flowing
About average for this time of year
Based on 61 years of record
1.95 ft
Water depth at gauge
7-Day Discharge Trend
What does this mean for your visit?
Flow is about average for this time of year.
About This Gauge
7-Day Flow Outlook
Based on the USGS gauge Alakahi Stream near Kamuela, HI (6 km away).
Today
Low
3 cfs
4/10Tomorrow
Low
4 cfs
4/10Thu
Low
4 cfs
4/10Fri
Low
6 cfs
4/10Sat
Low
5 cfs
4/10Sun
Low
5 cfs
4/10Mon
Low
4 cfs
4/10Best window: Today — low flow, mostly sunny then scattered rain showers (trip score 4/10).
Best time of year: this gauge typically runs highest from mid June to late July, peaking in July.
How we calculate this
This is a transparent outlook, not a precise forecast. We take the waterfall's current flow strength (how it ranks against its historical normal for today, from the nearest USGS stream gauge), carry that ranking forward along the gauge's seasonal curve, and nudge it for forecast rain. Confidence is highest for the next day or two and falls further out. Always check official conditions and your own judgment before visiting — high flows can be dangerous.
Know when to go.
Get a free email alert when waterfalls near Kukuihaele hit peak flow. We only send when conditions are worth the trip — no weekly newsletters, no spam.
Weather Forecast
The Terrain, Seen by LiDAR
Aircraft-mounted lasers measured this ground to within inches. Trees and buildings are digitally stripped away, leaving the bare shape of the land the water has carved.
Along the line through the falls, the bare ground drops about 471 feet, most of it in one sheer step, the signature of a plunge waterfall. The ground at the falls is roughly 2,167 feet above sea level.
Steep ground runs through the entire stretch: about 388 feet of descent in the 500 feet above the pin and 425 feet in the 500 feet below it. Facing east, the falls catch soft morning light.
Drag to compare. The dot marks the waterfall. The frame is about a mile across.
- Ground elevation
- 2,167 feet
- Measured by 1-meter lidar
- Drop at the falls
- About 471 feet
- Change in ground height within ~250 feet of the falls
- Faces
- East
- Catches soft morning light.
A slice through the lidar ground surface, from above the falls to downstream (heading east).
Elevation data: USGS 3D Elevation Program. Aerial imagery: USGS The National Map. Public domain.
Location & Access
Getting There
The exact location and directions to Aa Falls are not widely documented. Visitors are advised to consult local guides or resources for accurate directions.
Get Directions on Google MapsParking
Parking availability is unclear. It is recommended to check with local authorities or nearby facilities for parking options.
Elevation
2,188 feet above sea level
Coordinates
20.091140° N, -155.621598° W
Land Management
Managed by SDNR
Visitor Tips & Gear
Bring sturdy footwear, water, and insect repellent. Check weather conditions and consult local resources for trail and access updates.
As an Amazon Associate, we earn from qualifying purchases.
With 2.4 miles and 350 ft of elevation gain, sturdy boots and trekking poles will help on this moderate trail. Icy conditions are common in winter — traction cleats are a smart addition.
Columbia Watertight II Rain Jacket
Packs into its own pocket, seam-sealed, and keeps you dry from spray and surprise rain.
Earth Pak Waterproof Dry Bag
Keeps your phone and gear dry when waterfall mist soaks everything else.
Waterproof Phone Pouch (AiRunTech)
Cheap insurance — take photos right next to the falls without killing your phone.
Timberland Euro Sprint Mid Waterproof
Trusted waterproof boot with premium leather and grippy rubber sole — reliable on rocky, wet trails.
TrailBuddy Trekking Poles
Lightweight aluminum, cork grips, and flip-locks that actually hold — a best-seller for good reason.
Kahtoola MICROspikes
Cult-favorite traction cleats that grip ice and wet rock — essential for winter waterfall hikes.
Where to Stay
The Westin Hapuna Beach Resort
Fairway Villas Waikoloa by OUTRIGGER
Palm Villas 2 Bed/2 Bath Loft #F22
Hilton Waikoloa Village
Browse vacation cabins and private rentals nearby
Unique outdoor stays — tents, yurts, and treehouses
Rent a campervan or RV for your waterfall road trip
Some links are affiliate links. We may earn a commission at no extra cost to you.
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Nearby Attractions
Hawaii offers numerous natural attractions, including other waterfalls, beaches, and hiking trails. Consult local guides for recommendations.
Wildlife
The area may feature native Hawaiian flora and fauna. Visitors should respect wildlife and avoid disturbing the natural habitat.
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