Visit the Boulder County Ballot Measures website for information about 2025 ballot measures.

Share your feedback on Boulder County’s website by Friday, Oct. 3. Take the website survey.

Boulder County Housing Authority remains open during a federal government shutdown. Find out more.

Parks & Open Space

Birding Big Sit

Lagerman Agricultural Preserve

CANCELED – Hikes for Seniors: The Foothills Freeze

Heil Valley Ranch - Wapiti Trailhead 1188 Geer Canyon Rd., Boulder

Birds Of Prey Driving Tour

Rescheduled — Altona School Open House: Love Your Neighborhood Schoolhouse

Altona Schoolhouse

Parks & Open Space Advisory Committee (POSAC)

Commissioners' Hearing Room Downtown County Courthouse, 1325 Pearl Street, 3rd Floor, Boulder, CO, United States

Story in the Rocks: The Geologic History of Boulder County

Lyons Community Library 451 4th Ave, Lyons, CO

CANCELED – Astronomy: Eclipse This!

Ron Stewart Preserve at Rabbit Mountain 14950 N. 55th St., Longmont, CO

Birds of Prey Driving Tour

Lagerman Agricultural Preserve

Amazing Grasses of Boulder County

Ron Stewart Parks & Open Space Building 5201 St Vrain Rd, Longmont, CO

Living Map: Plants of Boulder County

Goodhue Farmhouse 2005 S. 112th Street, Broomfield, Broomfield, CO

Hikes for Seniors: Spring Awakening

Carolyn Holmberg Preserve at Rock Creek Farm 2100 S. 104th St., Broomfield, CO

Parks & Open Space Advisory Committee (POSAC)

Commissioners' Hearing Room Downtown County Courthouse, 1325 Pearl Street, 3rd Floor, Boulder, CO, United States