Stage 1 fire restrictions, enacted for unincorporated areas of western Boulder County.

Event Calendar

Cobbles of Time


The story of Glacial Lake Devlin and evidence of its catastrophic demise is a fascinating and little-known chapter in the geologic history of Caribou Ranch. Join volunteer naturalists on this 4.5-mile moderate hike to learn about the evidence firsthand. We will also learn about some of the oldest rocks in the area and the valuable minerals that formed and were mined nearby.

Registration for most programs begins on the 20th of the month before the event.

Registration required.


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.

Event Details

Start dateAugust 10, 2024 9:00 amEnd dateAugust 10, 2024 1:00 pmCalendarHikes & Events, Parks & Open SpaceGoogle Calendar

Organizer Details



VenueCaribou RanchAddress1521 CR 126CityNederland

Caribou Ranch