Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is St. Moritz (70% of total searches to Graubunden). The next most popular destinations are Chur (20%) and Davos (5%). Searches for hotels in Celerina/Schlarigna (5%) are also popular.
KAYAK users have found double rooms in Graubunden for as cheap as $176 (Poschiavo) in the last 3 days. The average price is $393.