Yes, you should report every auto accident you're involved in. In some cases it is illegal in Colorado to go without reporting an auto accident. If injuries were sustained by either parties you MUST report the car crash. Calling 911 is the best way to start that process immediately. You can still report the accident even if you decided to not initially report it. Visit The Colorado DMV site to get started reporting your auto accident now. If you would like more information check out this informative article that covers reporting auto accidents in Colorado.