Rocky Mountain National Park
Not every national park will let you go backcountry camping in the winter, but this one does. You’ve also got your sledding, skiing, boarding, tubing, snowshoeing, and ice climbing. This time of year is great for looking for moose (along with your more standard elk, mule deer, and bighorn sheep), and there’s a wealth of ranger-guided treks you can avail yourself of, too. Don’t miss the nearby Estes Park Winter Festival on January 18 and 19 -- beer, live music, and a chili cook-off are the highlights.