The small municipality of Kolsass in the Lower Inntal Valley lies at 553 metres above sea level and is located around 10 km from the town of Schwaz.
Kolsass was originally divided into two settlements. It takes its name from the Rhaetian words "Col" and "Sass" meaning "hill" and "rock". On the hill overlooking the village a castle was constructed, the Burg Rettenberg, which officially lies within the borders of the neighbouring municipality of Kolsassberg. Together with Kolsassberg, Kolsass has much to offer holidaymakers in its beautiful surroundings ideal for hiking and biking in summer as well as snowshoeing in winter. Kolsassberg even has its own small ski lift which is popular with families and beginners. Further winter activities include tobogganing and cross-country skiing on the large network of trails for both the Classic and the Skating technique in the Karwendel Silver Region.