The best walks and hikes in Waianae Kai Forest Reserve

Yes, for certain trails, permits are necessary. For example, accessing the Mount Kaʻala summit requires a permit as it passes through the Waianae Kai Forest Reserve and the Mount Kaʻala Natural Area Reserve. It's essential to check with the State of Hawaiʻi Division of Forestry and Wildlife for the most current permit requirements before you go.

While many trails in the reserve are challenging, there are easier options nearby. The Pink Pillbox Hike/Puʻu O Hulu Trail is a popular choice. It's a short but steep climb, just under 1.5 miles (2.2 km), that rewards you with fantastic views of the Waianae coast from the historic pillboxes.

The trail is extremely challenging and should only be attempted by experienced hikers. Expect very steep, muddy, and slippery sections, especially after rain. Ropes are installed in several places to assist with the climb. The final section near the summit features a boardwalk to protect the fragile bog ecosystem.

Generally, dogs are not permitted on trails within the Waianae Kai Forest Reserve or the connecting Natural Area Reserves. This is to protect the sensitive native ecosystems, which include rare plants and ground-nesting birds. Always check the specific regulations for each trail before planning to hike with your dog.

Sturdy hiking boots with good grip are essential due to the steep and often muddy terrain. Bring plenty of water (at least 3-4 liters for longer hikes), high-energy snacks, and sun protection like a hat and sunscreen. A rain jacket is also recommended as weather can change quickly at higher elevations. For difficult trails, consider bringing gloves for the rope sections.

Access is typically via car, as public transport options are limited. Trailheads, like the one for the Mt. Kaʻala Hiking Trail, are located at the back of Waianae Valley. Parking is often on the roadside near the trailhead. Be aware that car break-ins can be an issue in the area, so do not leave any valuables in your vehicle.

Many of the prominent ridge trails in the reserve are out-and-back routes. However, you can find loop trails in the surrounding areas. The North Shore viewpoint loop from Mokuleia offers a moderate circular hike of about 5.7 miles (9.3 km) through the nearby Mokuleʻia Forest Reserve, providing great views.

For stunning coastal scenery without an extreme climb, the Sea arch at Kaʻena Point – Yokohama Bay loop is an excellent choice. This moderate hike follows the coastline, offering dramatic views of the ocean, sea cliffs, and the natural sea arch at Kaʻena Point.

The Waianae Kai Forest Reserve is a critical habitat for native Hawaiian species. As you hike, look for native forest birds like the red 'apapane feeding on ʻōhiʻa lehua blossoms. The area is also home to the endangered Oahu elepaio and the impressive pinao, the largest dragonfly in the United States. The unique plant life, especially in the bog at the summit of Mount Ka'ala, is a major highlight.

The routes in this region are highly regarded by the komoot community. Hikers often praise the challenging nature of the climbs and the incredible panoramic views from the ridges. The feeling of being in a remote, wild part of Oahu, surrounded by unique native flora, is a frequently mentioned highlight.

The difficulty varies, but the reserve is best known for its challenging hikes. Trails often involve significant elevation gain on steep, rugged ridges. While there are a couple of difficult routes like the Puʻu Hapapa via Kolekole Trail, there are also moderate and easy options in the wider area to suit different fitness levels.