- Aspen is a city located in Colorado, United States. It is situated in the Rocky Mountains and is known for its beautiful landscapes and outdoor recreational activities. Aspen is a popular destination for skiing and snowboarding during the winter months and offers a variety of trails for hiking, biking, and fishing in the summer. The city is also renowned for its cultural scene, with numerous art galleries, music festivals, and theater performances. Aspen is home to several high-end resorts, restaurants, and shops, drawing in visitors from around the world.