Well, I didn't throw in spots like Wolf Creek, (probably the best for a shot at powder), Monarch, Crested Butte, Silverton, etc. Since the drive times from Fort Snort would be ridiculous.
The spots I originally mentioned are relatively close together for sure. Winterpark being the furthest from the other spots. About an hour, but drive wise from Fort Collins, it's in the same ball park, even closer than the others.
Either way from Fort Collins you are looking at a 2 plus hour drive to any of the ski areas. There isn't anything that is close to that city.