Join us for an easy 1-mile walk around Mud Lake. Discover the history of Mud Lake and the diversity of the upper montane life zone as you meander through the pines. The trail is flat and rocky with a few benches. 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.