I camp locally of course, I have a lot of places I like. I prefer to camp pretty rustic. That is, I take along everything I need for a few days. I camp in free open places so it isn_t expensive. No services at the campgrounds of course. But, if I am lucky, nobody around either. There are some nice places that aren_t far from Denver and easy to get to. Unless you have a sturdy vehicle with 4-wheel, I don_t recommend some areas. I have torn up my car trying to get to these rugged areas and it isn_t worth it.
So, I can only recommend places around Colorado, I would be happy to give some details. It is nice to get tips from a local. The weather is just about perfect for camping from now into September. Weekends, it can get crowded so I try to go around Mondays, or Tuesdays. It is nice to camp for about 2 nights and get a cheap room with a hot shower the third. Around October the weather cools off and it can be snowing in the mountains by then. I don_t camp when it is snowing, besides the cold, it is slippery to drive in and some roads get closed. Hope I helped. You can click on my name if you have any questions. I would recommend a vacation in Colorado sometime, just be sure to bring a car and plan on being around at least a week or so. There are lots of music festivals to go to. I think Vail, Aspen and Breckenridge have some things going. It is funny, most people only go to these towns for skiing, they are great to visit in the Summer. The rooms can be a lot cheaper also.