Ulupō Heiau State Historic Site

Rising from the wetlands behind the Kailua YMCA, Ulupō Heiau is one of Oʻahu’s most impressive ancient Hawaiian temples — a massive stone platform stretching roughly 140 feet long and 30 feet high, built entirely without mortar. According to Hawaiian legend, the heiau was constructed overnight by the Menehune, the mythical small people of Polynesian folklore, and its name translates to “night inspiration,” reinforcing that connection.

What makes Ulupō remarkable is its accessibility paired with its significance. Unlike many sacred sites that require lengthy hikes or special permits, this heiau sits just minutes from downtown Kailua, yet feels worlds away. The platform is constructed from waterworn basalt stones carried from considerable distances, a testament to the organized labor and engineering knowledge of pre-contact Hawaiian society. Archaeologists believe it served as an agricultural temple dedicated to ensuring abundant harvests from the surrounding taro fields and fishponds of Kawainui Marsh.

Visitors can walk the short interpretive path around the base of the heiau, read informational placards about its cultural history, and take in views of Kawainui Marsh — the largest remaining wetland in Hawaiʻi. The site pairs well with a walk along the nearby Kawainui Marsh Path. Plan for about 30 minutes to explore thoroughly.

The site is open during daylight hours year-round, with no entrance fee. Oʻahu’s mild climate makes any season comfortable, though mornings offer cooler temperatures and softer light for photography. Please treat the heiau with respect — it remains a sacred place in Hawaiian culture.

Explore Nearby

• Laupāhoehoe Point Light — Lighthouse in Hawaii
• Lā’au Point Light — Lighthouse in Hawaii