Vehicle registration fees in Colorado now include a $29 charge for the new “Keep Colorado Wild” pass, which is intended to generate funding for state parks and outdoor-related initiatives and will grant residents access to all state parks unless they opt out.

The initiative allows residents to save about $50 on an annual pass to Colorado’s 42 state parks. These typically cost $80 for a vehicle-affixed pass, but those who aren’t interested in the deal must be sure to check the correct box ...