How Douglas County Is Marking America 250 and Colorado 150
In 2026, the United States will mark the 250th anniversary of the Declaration of Independence, which is our nation’s semiquincentennial. At the same time, Colorado will mark the 150th anniversary of our entrance into the Union, our state’s sesquicentennial. As the Centennial State, Colorado is the only one who will observe twin anniversaries – our Sesquisemiquincentennial.
This year is a time to honor Colorado’s shared history as it is celebrated through community events, educational opportunities, statewide celebrations, and more. In Douglas County, special events are being planned to highlight the occasion.
Castle Rock
The Town of Castle Rock’s plan to celebrate America 250 – Colorado 150 include hanging banners and other patriotic displays, illuminating the Star atop the Rock from July through Colorado Day, Aug. 1, and installing public art at Rock Park Open Space. Several special events will be held to celebrate the sesquisemiquincentennial, including celebrations on Flag Day (June 14), the Fourth of July and Colorado Day (Aug. 1). As part of the Colorado Day celebration, there will be a special concert by Fitz and the Tantrums. Learn more about special events.
Local grants are available to support neighborhood events honoring the anniversary. Learn more about grant opportunities.
Highlands Ranch
The Highlands Ranch Community Association (HRCA) is holding an art contest to celebrate Colorado’s 150th birthday. Artists are invited to submit original artwork to be featured on a special one-time event pint cup. The deadline to submit is June 1. Learn more about the contest.
There will also be a free Colorado 150 Celebration on Aug. 1 at Town Center. This one-day festival brings together music, food, and culture from across our state. Enjoy live music and explore Colorado-themed vendors, food, and craft beverages. Learn more about the event.
At the Summer Sunset Concert on Aug. 22, there will be a special drone show, Stories in the Sky, to commemorate the anniversary. Celebrate the end of summer with live music and food trucks followed by the drone show. Learn more about the event.
Parker
In 2026, the Town of Parker’s Signature Events will go “Back to Our Roots” for America 250/Colorado 150 and Parker 45! The Town will be announcing a special logo to commemorate the milestone year and be a part of the Town’s celebrations. The official logo will be announced soon.
The anniversary will be incorporated into several of the Town’s signature events, including Bike to Work Day (June 24), Independence Day, Parker Fall Fest (Sept. 26), and Holidays in Parker.
Learn more about Parker’s 250/150/45 Celebrations.
Sterling Ranch
Walk250 challenges every Sterling Ranch resident to complete 250 miles of walking/running, etc., between now and July 4 to honor our nation’s 250th anniversary. All Walk250 participants who complete the 250-mile challenge will have the opportunity to win prizes for completing the challenge. Learn more about Walk250.
Other Events Highlighting History in Douglas County
Throughout the year, other events are being held across Douglas County that highlight local history. See the list of upcoming events.
Know of an event not on the list? Submit it here.
Statewide Events to Commemorate America 250 – Colorado 150
Statewide, the America 250 – Colorado 150 Commission was established to guide Colorado’s twin commemorations in ways that enable all Coloradans to participate. Activities include a Colorado digital passport, where participants can check-in at sites to earn rewards, badges, and exclusive offers.
To learn more about events related to the America 250 – Colorado 150 celebrations, visit historycolorado.org/colorado-150.
Every effort has been made to ensure the accuracy of the information provided, but be sure to check the event’s website for changes or cancellations.
View the complete calendar of events happening throughout Douglas County.
