Arosa is a town and a municipality in the Plessur Region in the canton of Graubünden in Switzerland. It is both a summer and a winter tourist resort. Arosa is first mentioned about 1330 as Araus. In 1383 it was mentioned as Orossen and in 1428 it was first mentioned as Arosa. Arosa has a well-known and safe skiing area and boasts over 60 kilometers (37 mi) of slopes. The main industry is tourism: there are 4287 guest beds. Arosa has an unemployment rate of 1.32%. As of 2005, there were only 4 people employed in the primary economic sector and about 2 businesses involved in this sector. 308 people are employed in the secondary sector and there are 30 businesses in this sector. 1,202 people are employed in the tertiary sector, with 185 businesses in this sector.