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2025 Kauai Marathon and Half Marathon Sunday August 31 2025 Days Hours Minutes Seconds Fun Race Facts Age demographics Oldest Full 78 Youngest Full 16Oldest Half94 Youngest Half 8 Pounds of Ice on the course on race day 9500 pounds Gallons of water on course on race day 1600 gallons Kauai The Garden Island Fun Fact Kauai has the only navigable rivers in Hawaii. Geography Home to Waimea Canyon nicknamed the Grand Canyon of the Pacific For Plant Lovers Home to National Tropical Botanical Garden headquarters and largest collection of Native Hawaiian Plants Community Number of Keiki Reached through The Kauai Marathon Youth Running Program and the Keiki races 2003 in 12 years Economic Impact to the island over 48 million over 15 years Funds distributed to Kauai nonprofit groups 280000 Our Sponsors Sign up for our Newsletter Follow us. Click here to write a review. The Kauai Marathon Half Marathon emailprotected .