The ML season for Deer (west of I25), Bear, and Elk run simultaneously for 9 days. This year from Sept 9 thru Sep 17. No guarantee next year will be the same, but if it is, it will run from the second saturday through the third sunday of september.

The ML season is longer than first (elk only) or third season but the same length as secondrifle season. Like txhunter58 said, you have to pick the season (for each species and can only draw one tag per species). F.G., I think this is where you misunderstood what txhunter58 meant, though you are correct in saying that one can hunt different species(or even the same species with two tags) in more than one season. One may be allowed to purchase a leftover tag, provided, one of the tags is a female of the species and in the case of deer, that tag is in one of the allowed units.

For a given GMU, rifle seasons are typically easier to draw. So while you can't hunt with a centerfire in ML season, nothing prevents you from hunting with a ML in rifle season, or using scopes, saboted bullets, or a Savage IIML charged with smokeless(all of which are prohibited during regular ML season). If you hunt 2nd or 3rd season in good elk country, be prepared to share public land with the "red army" (it sounds like a war).

Here is the link to the DOW http://wildlife.state.co.us/Hunting/.