I agree. US 34 takes you over Trail Ridge Road and US 40 west from Granby goes through Hot Sulphur Springs, Byers Canyon, Kremmling, and over Rabbit Ears. That is much faster than going back to Ft. Collins and getting on CO 14, if you are in Estes Park before Trail Ridge closes for the season.
There are a number of Forest Service campgrounds around Shadow Mountain and Granby reservoirs. There is also an inexpensive city campground next to the Colorado River in Hot Sulphur Springs. There are several places for legal dispersed camping on top of Rabbit Ears-Muddy Pass, so you can be stay right in the area with the aspen groves.
Just watch for the bow hunters who will be in that same area!
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