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.

Parks & Open Space

Junior and Senior Fishing Derby

Walden Ponds Wildlife Habitat 3893 N. 75th St., Boulder

Create your fishing dream team of one senior and one junior angler and come enjoy a beautiful fall morning fishing together for prizes and fun. Participants need one senior, 65 or older, and one junior, 15 or younger, to fish together as a team. Prizes will be awarded to the team that catches the heaviest trout, has the largest age difference, and are first to catch the limit. Drop by anytime between 9 a.m.-noon. The pond is stocked with rainbow trout; artificial and live bait are permitted. Bring your own fishing gear and lawn chairs for seating. Seniors must have a valid Colorado fishing license. * Please note, the wheelchair accessible fishing pier at Wally Toevs Pond is closed until further notice due to structural issues. Unfortunately, there is no wheelchair access to the shoreline for fishing at this time. We apologize for any inconvenience this may cause. Registration is not required for this activity, but you can still sign up to be notified in case the event is unexpectedly canceled. Sign Up .tribe-events-c-subscribe-dropdown{display:none;}

Assay Office Museum Open House

Assay Office Museum 6352 Fourmile Canyon Dr, Boulder

Stop by the unique Assay Office Museum on this open house day. Learn about assaying, hard rock mining, and the families in the area from long ago. Registration not required.

Owls of Boulder County Slideshow Program

Louisville Public Library 951 Spruce Street, Louisville

More than half of the owl species in the U.S. have been seen in Boulder County. These owls live here during parts of the year, and most will build their nests locally. Join volunteer naturalists for an indoor slide program to learn about these fascinating, diverse creatures, especially the adaptations that make them expert hunters. Registration for most programs begins on the 20th of the month before the event. Registration required. Register .tribe-events-c-subscribe-dropdown{display:none;}