Was recently on the Mt of the Holy Cross trail with nephew, my having summited the 14er four times over three routes since 1975. Came across a large, utterly smelly fresh mound of bear scat, right off the Halfmoon Pass trail at 12:30am. Even though the trail is popular, the bears are roaming all over it. Last five years in Colorado, now carry bear spray.  Keep your tents clear of food, hang up the food way up high and if necessary, like on the 4 Pass Loop in Aspen, pack in bear proof containers. Enjoy and be safe.