Colorado Parks and Wildlife

Built World

Provided biological expertise and monitors animal use

Interstate 25 near Colorado's Greenland exit split 39,000 acres of habitat, and for decades elk and pronghorn could not cross it. The corridor averaged about one deer-vehicle crash per day in peak migration. In the overpass's first ten months, wildlife collisions dropped 91 percent, from a five-year average of roughly 40 a year to two.

Updated Oct 16

Rule Changes

As of August 2026: Sets and certifies the required safety-course standards

Starting August 1, 2026, buying most semiautomatic rifles or shotguns with a detachable magazine in Colorado requires a county sheriff's eligibility card, an in-person safety course, and a written exam. The passing score is 90%. No court blocked the law before it took effect.

Updated Aug 2