Nāpau Crater

The main access to Nāpau Crater is via the Nāpau Trail. This trail can be reached from the Mauna Ulu parking area or the Nāulu Trailhead, which is located on Chain of Craters Road within Hawaiʻi Volcanoes National Park. The hike traverses diverse terrain, including recent lava flows and dense tree fern rainforests.

The hike to Nāpau Crater is considered moderate to difficult. Hikers should be prepared for challenging terrain, primarily traversing over uneven lava rock. Sections of the trail can also be overgrown. You'll encounter fascinating geological features like lava trees, lava rivers, and kipukas, which are islands of older vegetation amidst barren lava fields.

Along the Nāpau Trail, you can witness a variety of volcanic formations. These include lava trees (formed when molten rock engulfed existing vegetation), lava rivers and lava channels, and kipukas. The trail also offers views of the Puʻu ʻŌʻō lava cone and passes near Makaopuhi Crater, both significant sites in Kīlauea's East Rift Zone history. Recent eruptions have also added new lava features within and near Nāpau Crater itself.

Parking for the Nāpau Crater hike is available at the Mauna Ulu parking area or near the Nāulu Trailhead on Chain of Craters Road. While a permit isn't required for day hiking, if you plan an overnight stay at the Nāpau Campground, a backcountry camping permit is essential. You can find more information on permits and planning your visit on the NPS website.

Due to its challenging and remote nature, with uneven lava rock terrain and potentially overgrown sections, the Nāpau Crater hike is generally not recommended for young children or beginners. Hawaiʻi Volcanoes National Park has strict regulations regarding pets; dogs are typically not allowed on backcountry trails like the Nāpau Trail to protect wildlife and ensure visitor safety. Always check current park regulations before bringing pets.

Given the challenging terrain and lack of facilities, it's crucial to pack adequately. Essential items include sturdy hiking boots, ample water (as there are no water sources), sun protection (hat, sunscreen), rain gear, snacks, and a first-aid kit. A map and compass or GPS device are also highly recommended due to the remote nature of the trail. Checking the weather forecast before you go is also wise.

The hike to Nāpau Crater is a significant undertaking. While exact times can vary based on fitness levels and the chosen starting point, it's generally considered a full-day hike. Hikers should plan for several hours of strenuous activity over uneven terrain, making sure to account for daylight hours and carrying sufficient supplies.

While Hawaiʻi Volcanoes National Park is open year-round, the best time to hike Nāpau Crater often depends on personal preference and current conditions. The area can be hot and exposed, so early mornings are often preferred to avoid the midday sun. Rain can occur at any time, making trails slippery. It is critical to check current volcanic conditions and park alerts before planning your visit, as volcanic activity can lead to trail closures or hazardous air quality. The USGS and NPS websites are excellent resources for this.

Nāpau Crater itself is generally considered a more remote and less crowded hike compared to some of the park's more accessible trails due to its difficulty. However, if you're looking for other experiences, Hawaiʻi Volcanoes National Park offers a range of trails. For a different perspective on volcanic landscapes, you might consider trails around Kīlauea Iki Crater, which offers a unique walk across a solidified lava lake, or other shorter trails accessible from Chain of Craters Road. Always check trail conditions and difficulty ratings.

The area around Nāpau Crater has a rich and active volcanic history, primarily influenced by eruptions from Kīlauea's East Rift Zone. The Nāpau Trail passes through lava flows from the Mauna Ulu eruptions (1969-1974). The nearby Puʻu ʻŌʻō vent was active from 1983 to 2018, and its lava flows have partially filled Nāpau Crater. More recently, in September 2024, Kīlauea experienced an eruption in and near Nāpau Crater, covering over 20 acres with molten rock and featuring lava fountains. This ongoing activity highlights the dynamic nature of the region.

The Nāpau Crater trail is located in a remote part of Hawaiʻi Volcanoes National Park, and there are no facilities or amenities directly at the trailheads (Mauna Ulu parking area or Nāulu Trailhead). Visitors should plan to be self-sufficient, carrying all necessary water, food, and supplies. The main visitor center for Hawaiʻi Volcanoes National Park, located near the park entrance, offers restrooms, water, and a gift shop, but it is a drive from the Nāpau Crater access points.