The foothills are a dynamic ecosystem that transforms in the winter. As the snow falls and the temperatures drop, plants and animals must adapt to survive in the harsh conditions. Join us for a moderate 1.5-mile hike as we explore this ecosystem. 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.