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.

Assay Office Museum

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.