Caribou Ranch closes during early spring and summer to allow elk, deer, and now moose to raise their young undisturbed. It's a magical place to see a wide range of flora and fauna, and we are celebrating its reopening to two-legged mammals with a 4-mile hike to explore the property's history, geology, and plant and animal life. The group will stop for lunch during the program — please pack a lunch! Registration for most programs begins on the 20th of the month before the event. Registration required. Register Registration is required through Discover Boulder County, Parks & Open Space’s volunteer and event registration system. If you’re new to the system, you'll need to create an account. But it’s easy and we only use your contact information to communicate about events you register for. We will never sell or give your information to a third party.