If one does not use or possess ones own boat, you have to get to Strömstad first and then take a ferryboat "Kosterbåten" to reach Koster.Islands Departure from the north harbor in Strömstad, a pleasant crossing of around 40 minutes.
Welcome aboard the "Kosterbåtarna"
Koster Marin operate passenger ferries to the Koster islands all year round.
The passenger ferries depart from the "norra hamnen" in Strömstad at the main square (torget). Street adress Ångbåtskajen, Strömstad. Here you will also find a waiting room with storage boxes for luggage.
Tickets can be bought on board (cash / card) or in machines on the quay in Strömstad (credit cards). ATMs are located near the ferry in Strömstad.