Koster Trail

The Koster Trail 2026 is a distinctive trail running event scheduled for Saturday, May 9, 2026, located within the heart of Kosterhavets National Park. This year marks a significant milestone as the race celebrates its 5th anniversary. The course offers a challenging terrain that traverses the rugged granite cliffs of Bohuslän, the sandy beaches of Nordkoster, and narrow forest paths leading to the island's panoramic viewpoints. Beyond the competitive aspect, the event emphasizes the unique coastal lifestyle, offering finishers a chance to recover with a cold salt-water dip in the sea followed by a meal at Sweden's westernmost restaurant, Kosterhavets Ekobod.

The Koster Islands (Nordkoster and Sydkoster) are situated in the Kosterhavet National Park, Sweden's first marine national park, located just off the coast of Strömstad. The islands have a very small year-round population of roughly 300 residents, but this swells to thousands during the summer months. The demographic profile is largely Swedish, and the community is highly focused on sustainable tourism and artisanal fishing. The median household income in the Strömstad municipality is approximately 315,000 SEK. The Koster Trail takes place on Nordkoster, the smaller and more rugged of the two main islands, which is car-free and accessible only by the Koster ferry from the Strömstad harbor.

The race organizers emphasize the preservation of the delicate island environment, encouraging participants to utilize the regular ferry services and practice "leave no trace" principles while running through the protected national park. The technical nature of the granite rock can be slippery if damp, making it a favorite for experienced trail runners who enjoy varying elevation and footing. As a 5th-anniversary celebration, the 2026 edition is expected to feature commemorative elements honoring the race's history on the islands. For international participants, the closest major transport hub is Gothenburg, with direct train and bus connections to Strömstad.