The bear hibernation season ends around March to April (the beginning of spring), so it's no surprise that there are more and more grizzly sightings lately at Yellowstone National Park.
There's an old saying I've heard many times from friends and family in Wyoming that pertains to wild bear sightings that goes: "you don't have to run faster than the bear to get away, you just have to run faster than the guy next to you".
Local rangers do a great job of educating the public, enforcing the rules, and keeping Fort Collins' parks and natural areas as safe as possible, for both humans and animals alike.