Colorado Bluebird Project

  1. Informational Open House

    Thursday, Feb. 16, 2023, 7 to 8 p.m.
    The Millhouse at Philip S. Miller Park, 1381 W. Plum Creek Parkway

    Volunteer Monitor Training

    Wednesday, March 1, 2023, 6:30 to 8 p.m.
    The Millhouse at Philip S. Miller Park, 1381 W. Plum Creek Parkway

Volunteers needed for the 2023 Season!

Volunteers of all ages are recruited in February to assist with monitoring the nest boxes from April through August. Volunteers will visit the boxes on a rotating basis once every two or three weeks to collect important nesting data. Additionally, volunteers help with the maintenance and repair of older nest boxes. 

New volunteers are required to attend both the Open House and Monitor Training to learn project background, species identification, monitoring tips and instructions for entering monitoring data to NestWatch, the online nationwide nest-monitoring program and database maintained by the Cornell Lab of Ornithology. 

Wondering what to expect as a volunteer? Check out a slideshow (PDF) featuring photos provided by our volunteers from the 2022 season. 

For information on volunteering in 2023, contact us at 303-814-7456 or email us

Improving bluebird populations

The Colorado Bluebird Project operates under the guidance of Denver Audubon and is offered through POST Partners in Castle Rock. This volunteer-run project aims to improve the vitality of bluebird populations throughout Colorado and to inform and educate the public about bluebirds. For more information, see the project overview sheet (PDF).  

For the past 15 years, with the help of hundreds of volunteers and students from several Castle Rock schools, we have watched and carefully monitored thousands of nests from native cavity-nesting birds such as bluebirds, swallows, wrens and chickadees in nest boxes established all over Town. We have documented over 7,000 chicks fledge from these boxes since 2007. Each year, the monitoring efforts and data collected by volunteers are assembled into a summary presentation (PDF) that features highlights from the year, overall project data and quotes from the volunteers.

Information about monitoring a nestbox

Feel free to download our Colorado Bluebird Project Volunteer Training Manual (PDF) as a reference for either your backyard monitoring or as one of our registered nest-box monitoring volunteers. We encourage those installing nest boxes in their own yards to follow these guidelines (PDF).

Additional educational opportunities

The Town’s Natural Resource Specialist, Barbara Spagnuolo is available for educational presentations to schools, scout troops, volunteer groups and community organizations. Learn more about the program and how you can help bluebirds in Castle Rock.

Bluebird nest boxes in Castle Rock

Bluebird boxes are located throughout Castle Rock on various public parks, trails, open space and school properties. View a map of all the locations (PDF).


Thanks to the volunteers mentioned below, who contributed over 2,000 hours to help with the program and increase our Bluebird and Tree Swallow populations in Castle Rock.

If you were a volunteer and are curious about the specific site you monitored, we can provide a site summary. Contact 720-733-2294 or email us for more information.

  1. Nest Box Locations
  2. Colorado Bluebird Project Volunteers
  • Bison Park
  • Butterfield Crossing Park
  • Castle Rock Elementary School
  • Cedar Hill Cemetery
  • Crystal Valley Ranch (at Sellars Gulch)
  • Douglas County High School
  • Faith Lutheran Church
  • Flagstone Elementary future park site
  • Flagstone Elementary School
  • Gateway Mesa interior
  • Gateway Mesa Open Space
  • Gemstone Park
  • Matney Park
  • Memmen Ridge Open Space
  • Mesa Middle School
  • Metzler Ranch Park
  • Mitchell Gulch Park
  • Native Legend Trail (two sites)
  • Philip S. Miller Park
  • Plum Creek Park
  • Quarry Mesa Open Space
  • Red Hawk Ridge Golf Course (two sites)
  • Renaissance Magnet School
  • Rhyolite Regional Park
  • Sage Canyon Elementary School
  • Stewart Trail at Ridgeline Open Space
  • The Rock Church
  • Woodlands Bowl Open Space
  • Wrangler Park