l am not familiar with colorado camping rules.If a group of people wanted to go backpacking into the middle of nowhere for 2 weeks can they do that?Do they HAVETO report into a ranger station?

What trouble are you in if you get caught with food outside 'bear containers'?Not by bears..By rangers or whatever.

And what if you wanted to set up a campsite in the middle of nowhere and stay there a week.Are there any rules against something like this?Where could l do this in colorado?

In Colorado about 75% of the land west of Interstate 25 is either Forest Service or BLM land. You can pretty much hike and camp where ever you want. You will have to check the website for whatever National Forest you plan to visit for any fire restrictions or any other rules. These links should tell you all you need to know.
http://fs.fed.us/
http://blm.gov/wo/st/en.html

You do not have to report to a ranger station. However a lot of the trail heads do have a book you can and SHOULD log in at.
Gives an idea as to which way/where you are going and the anticipated date of return. Good for any search parties
should the need happen.

There r lots of places to go ''backcountry'' in Colorado, my ex & l used to go all the time. You do not usually have to register unless u r going into the National Park areas - where u have to get a permit to camp. We do not have too big of a bear problem - in 10 years of backpacking here, l never even saw a bear! The biggest thing is to make sure that u do not set up camp too close to a body of water or too close to the trail - that is about the only things that we ever got in trouble for.

Have fun! You might search for the Colorado Mountain Club - they may have some good information on their website.

It is not required to check in but you should at least tell someone.

1) Where you're going.
2) When you will be back
3) What to do if you miss your checkin.

Laters.