First season is "usually" warm and dry. It has been this way for the past several years anyway. Depending on elevation, it may frost at night, but not always. Daytime highs are normally above 55 with 65-70 not uncommon even in the higher elevations. It RARELY snows. Success rates for first season are normally 15-20% which doesn't statistically vary much across the other 3 seasons. First season, however, is only for elk, not deer so you have less hunters in the woods normally. It also can sometimes take advantage of late rutting activity. Bulls are still bugling occasionally and tending harems during first season. Expect to hunt as high as you can during first season.
So actually you'll be going during the second rifle season which starts the 16th in Colorado. The past couple of years, it has been unseasonably warm and dry much in part due to the drought conditions this state has been having. This year, expect the unexpected. It was probably one of the wettest summers I can recall in a long time. I would imagine that this year, you could anticipate on getting some snow, depending what area of the state you're hunting. The cooler weather may help with the hunting.
I went to the same area ten years ago. We had snow almost every night and then it would be 60 or warmer during the day. My dad has been back almost every year and has never seen snow since. We had a hunch that there may be a chance of snow again this year. Thanks for the info. I'm getting excited to get out there.
Elk have been killed close to roads where they could be loaded whole into the bed of a pickup. But it doesn't happen often and I'm not sure that is the experience that I long for. The type of elk hunting that I prefer requires rigorous physical exertion that can cripple someone who is not in shape. Being a college hockey player I have to be in at least fair physical condition most of the year but when one of my buddies got back from the Navy Seals he changed the way I think about physical...