The Koster Islands: Exploring Sweden's Only Marine National Park

Located off the coast of Strömstad in Northern Bohuslän, the Koster Islands (primarily North and South Koster) are a unique and beautiful archipelago destination. They are best known as the heart of Kosterhavet, Sweden's only marine national park, offering exceptional natural experiences both on land and in the sea.

The Koster Islands are largely car-free, promoting a peaceful environment ideal for exploring the rocky West Coast scenery, hiking along coastal trails, cycling, and discovering rich marine biodiversity. They are a perfect destination for nature lovers and those seeking tranquility by the sea.

This guide provides information for new visitors to Sweden interested in experiencing the distinct natural beauty of the Koster Islands.

Access to the Koster Islands is by passenger ferry from the town of Strömstad. Strömstad is located on the West Coast, reachable by train or bus from cities like Gothenburg or Oslo (in Norway, due to its proximity to the border).

The ferry journey from Strömstad harbor to the various stops on North and South Koster takes around 30-45 minutes, offering scenic views of the outer archipelago. Ferries run year-round, though the schedule is more frequent in summer.

Visitors cannot bring cars onto the islands (except for island residents with specific permits), so prepare to leave your vehicle in Strömstad or travel via public transport to the ferry terminal.

The Koster Islands are largely car-free, making walking and cycling the primary ways to get around and enjoy the peaceful environment. The islands have a network of paths and small roads.

• Walking: Explore coastal trails, stroll through charming small communities, and hike across rocky landscapes. The islands are relatively compact, especially South Koster, allowing you to reach many areas on foot.
• Cycling: Cycling is very popular on the Koster Islands, particularly on South Koster which has more roads. Bicycle rentals are available near the ferry docks on South Koster. Note that rental bikes are typically for use only on South Koster.
• Cable Ferry (South Koster): There is a small cable ferry connecting different parts of South Koster across a narrow strait, making it easier to explore the length of the island by bike or foot.
• Between Islands: Passenger ferries connect North and South Koster, allowing you to easily travel between them to explore both islands.

The main draw of the Koster Islands is their stunning nature, part of Kosterhavet Marine National Park:

• Kosterhavet Marine National Park: Explore the unique marine environment through snorkeling, diving, or boat trips. The visitor center, Naturum Kosterhavet (located at Ekenäs on South Koster), provides excellent information about the park's biodiversity and offers activities and guided tours.
• Coastal Nature: Hike along the rocky shores, discover hidden coves, and enjoy the characteristic West Coast landscape with its smooth, wind-swept rocks and hardy coastal vegetation.
• Bölinge (South Koster): A notable area on South Koster with a beautiful sandy beach, which is less common on the predominantly rocky West Coast.
• Unique Flora and Fauna: Look out for rare plants adapted to the coastal environment and keep an eye out for seals lounging on skerries (maintain a respectful distance). Birdwatching is also popular.
• Hiking Trails: Numerous marked trails on both islands cater to different fitness levels, leading you through varied landscapes from coastal heaths to small wooded areas.

Dining options on the Koster Islands are primarily found in the small harbor areas, particularly on South Koster. They often feature fresh seafood, reflecting the island's coastal location and heritage.

You can find restaurants and cafés offering lunch and dinner, especially during the summer season. Some may also offer fika. There is typically a grocery store on South Koster for self-catering or picking up picnic supplies.

The summer months (June to August) are the most popular time to visit the Koster Islands. During this period, the weather is warmest, ferry services are most frequent, all businesses are typically open, and it's the best time for swimming and enjoying marine activities.

The shoulder seasons (May and September) can also be very pleasant, with fewer crowds, milder weather, and nature coming alive (spring) or displaying autumn colors (September). Some services may have limited opening hours.

Visiting outside of these months is possible by ferry, but services are reduced, many businesses are closed, and the weather can be cold and windy. However, it offers solitude and the raw beauty of the winter coast.

Costs for a trip to the Koster Islands primarily include:

• Ferry Fare: The return ticket from Strömstad is the main transport cost (check current prices with Koster Marin or Västtrafik).
• Accommodation: If staying overnight (see below).
• Food & Drink: Costs for meals, fika, or groceries.
• Activities: Most nature experiences (hiking, visiting the national park visitor center) are free. Costs apply for bicycle rental, guided tours, or specific marine activities like boat trips.

Practical advice for exploring the Koster Islands:

• Check Ferry Schedules: Confirm the latest timetable, especially for your return journey and travel between North and South Koster.
• Wear Sturdy Shoes: Essential for walking on rocky terrain and hiking trails.
• Dress in Layers: The West Coast can be windy and weather can change quickly.
• Sun Protection: Even on cloudy days, the sun reflecting off the water can be strong.
• Bring Water and Snacks: Especially if planning longer hikes away from the harbor areas.
• Respect the National Park: Follow rules regarding nature, waste, and private property. Do not pick plants or disturb wildlife.
• Cashless: Card payment is widely accepted, but it's always a good idea to check with smaller establishments.

Accommodation is available on both North and South Koster, including guesthouses, hotels, and vacation rentals. Camping is generally only allowed in designated areas, such as the nature campsite on North Koster.

Staying overnight on the islands allows for a more immersive experience, especially enjoying the tranquility in the evenings after the day visitors have left. However, options can be limited and book up quickly in summer.

Alternatively, you can stay in Strömstad or other nearby towns on the mainland and take the ferry for day trips to the islands.

The Koster Islands offer a fantastic opportunity to experience the raw beauty of the Swedish West Coast and explore a protected marine environment. Their car-free status contributes to a peaceful atmosphere, making them ideal for active visitors who enjoy hiking, cycling, and being close to nature.

With stunning coastal views, unique flora and fauna, and the chance to learn about the marine national park, a trip to the Koster Islands is a memorable addition to any visit to Southern or Western Sweden.

Ready to plan your trip? Here are some helpful links:

• 🔗 Information on traveling to Koster (Vastsverige.com)
• 🔗 Kosterhavet National Park Visitor Information
• 🔗 Official Website for the Koster Islands