Townsendia at Bald Mountain

The Boulder County Nature Association (BCNA) is a private, non-profit, publicly funded organization committed to preservation of the cultural and natural history of Boulder County and adjacent areas of the Colorado Front Range.

We conduct and support natural area studies, flora and fauna studies, historical research, wildlife inventories, and geological research.

We also disseminate natural and cultural history information to the public through nature hikes, classes, slide programs, publications, seminars, support for interpretive facilities in Boulder County, and an annual symposium on the status of Boulder County ecosystems.

We work with the Boulder County community to manage our local ecosystems so that they are sustainable and healthy.

Current Events

For more information see the latest BCNA Buzz or Newsletter.

April membership drive: This is the month to renew your membership or join BCNA!

May 8, 10, 24: Breeding Warblers of the Boulder-Denver Area class with Paula Hansley

May 18: BCNA board meeting at 3 pm at OSMP south conference room (66 S Cherryvale Rd). All are welcome to attend. NOTE: Board meetings are scheduled for the second Sunday of odd-numbered months. PLEASE NOTE DATE CHANGE BECAUSE OF CONFLICT WITH MOTHER'S DAY.

April 19 or 22 or May 3, 10 or 22: BCNA is partnering with Wildlands Restoration Volunteers (WRV), Boulder County Parks and Open Space, Boulder County Audubon Society and the Colorado Native Plant Society to help eradicate myrtle spurge, a "LIst A" noxious weed. We need your help! Please sign up at

Monthly Nature Almanac


KGNU features a short program with Steve Jones and Ruth Carol Cushman on the first Friday of every month. For each program, they visit a Boulder County nature site to record sounds there and discuss topics of interest. They are also the authors of Wild Boulder County: A Seasonal Guide to the Natural World.

The programs are archived by month, with information about events happening in the natural world in Boulder County for that month.

April 2014 Audio: Sand cranes at midnight

April Seasonal Events in Boulder County

Subscribe to the Nature Almanac PodcastIt's also available in iTunes.



Nature-Net is BCNA's email forum for announcements of classes and trips and discussions of many topics relating to Boulder County's natural environment. Nature-Net subscription information.