Stage 1 Fire Restrictions, effective Aug. 12, 2025, for unincorporated western Boulder County.
Visit the Boulder County Ballot Measures website for information about possible 2025 ballot measures.
- This event has passed.
Through Time and Stone: Exploring Geology at Hall Ranch
Join volunteer naturalists on a moderate 2.5-mile hike to explore Hall Ranch’s remarkable geology. During the hike, you’ll observe different rock formations that took millions of years to form. Learn more about how the mountains and canyons in this area were created while taking in incredible views!
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.