During the winter most of Trail Ridge Road is closed due to heavy snow, limiting motorized access to the edges of the park. Winter activities include snowshoeing and cross-country skiing which are possible from either the Estes Park or Grand Lake entrances. On the east side near Estes Park, skiing and snowshoeing trails are available off Bear Lake Road, such as the Bear Lake, Bierstadt Lake, and Sprague Lake trails and at Hidden Valley. Slopes for sledding are also available at Hidden Valley. The west side of the park near Grand Lake also has viable snowshoeing trails. Backcountry skiing and snowboarding can be enjoyed after climbing up one of the higher slopes, especially late in the snow season after avalanche danger has subsided, and technical climbing remains also a possibility, although typically differing in style from the summer months.
Back to the Fall River Road, and it’s just another few hundred yards to the Sheep Lakes Information Station. From here you have about the best chance in the park to see the Rocky Mountain Bighorn Sheep, a truly impressive sheep species that is notable for its agility, as well as having enormous horns. Be sure to keep your distance from the sheep and any other animals here, they are wild animals and this is their home!
Cow Creek Trail follows Cow Creek, with its many beaver ponds, extending past the Bridal Falls turnoff as the Dark Mountain trail, then joining the Black Canyon trail to intersect the Lawn Lake trail shortly below the lake. North Boundary Trail connects to the Lost Lake trail system. North Fork Trail begins outside of the park in the Comanche Peak Wilderness before reaching the park boundary and ending at Lost Lake. Stormy Peaks Trail connects Colorado State University's Pingree Park campus in the Comanche Peak Wilderness and the North Fork Trail inside the park.