Boulder County Assessor’s Office will be closed Thursday, Nov. 30. The offices will reopen Monday, Dec. 4.

Event Calendar
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iNaturalist Bioblitz


Discover how to use iNaturalist to document the wildlife and plants you see in Boulder County, and participate in the annual City Nature Challenge that helps record as many plants and wildlife as possible! Bring your cell phone or camera and get hands-on instruction while enjoying time outside with other nature enthusiasts. More preparation instructions and information will be sent to those registered. Families welcome.

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 dateApril 30, 2022 10:00 amEnd dateApril 30, 2022 12:00 pmCalendarHikes & Events, Parks & Open SpaceGoogle Calendar

Organizer Details



VenueRon Stewart Preserve at Rabbit MountainAddress14950 N. 55th St.CityLongmont

Ron Stewart Preserve at Rabbit Mountain