The area around Silverton has 150 miles of snowmobiling trails through the Rio Grande, San Juan, and Gunnison National Forests. The trails rise up over 13,000 feet elevation, making them some of the highest snowmobile trails in the country.
The Top of The Rockies Tour is a very popular tour near Vail. The operator is Nova Guides and they have been in business offering outdoor adventure for over 30 years. The views are incredible.
The coolest part about this trip is the views of several Summit County ski areas, including Breckenridge, Keystone, and Copper Mountain.
Leadville is known for being the highest (elevation) city in the country as it sits above 10,000 feet. This means lots of cold weather and snow, which means lots of great snowmobiling. The best provider is White Mountain Snowmobile Tours.
Kebler Pass gets a lot snow and it offers the best snowmobiling in the Gunnison / Crested Butte area. There is a local snowmobile club called Sno Trackers who provide updates on snow conditions and the best trails.
Kremmling lies at the confluence of Muddy Creek, Colorado River, and Blue River. The town takes pride in its nickname as "A Sportsman's Paradise". The area is very big on boating, hunting, and ATVs during the summer. Winters are for ice fishing and snowmobiling.
Winter Park offers the best snowmobiling that is close to Denver. Winter Park is about a 65-mile drive from the Mile High City. The best operator is Grand Adventures, whose tours ride over the continental divide and top out around 12,000' elevation.
This is a 120-mile stretch has multiple access points between Glenwood Springs and Grand Junction. The trail begins at Sunlight Ski Area near Glenwood in the White River National Forest. The trail ends in the Grand Mesa National Forest near Powderhorn ski area.
Rabbit Ears Pass is known as a beautiful drive that drops travelers into Steamboat Springs. The snowmobiling is even more beautiful. Steamboat is known for its "champagne powder". The top provider in the area is Steamboat Snowmobile Tours.
The top spot has to go to "The Snowmobiling Capital of Colorado". Grand Lake has more trails than anywhere else in the state, with 300 miles of trails. America's Best Online ranked Grand Lake as one of the "Top 10 Snowmobiling Areas in the United States". Snowmobile enthusiasts can play in the nearby Arapaho Forest.