Longmont 155 | Colorado 150 | United States 250 - City of Longmont Skip to main content

Longmont 155 | Colorado 150 | United States 250

Historical photo of Main Street in Longmont CO with an overlaying logo marking the 155-150 and 250 USA anniversaries in 2026.

Celebrating 155 years of Longmont 

 

Did you know 2026 marks not one, not two, but three significant anniversaries?

In 2026, Longmont turns 155, Colorado will celebrate 150 years of Statehood, and the United States will mark 250 years since the signing of the Declaration of Independence. These triplet milestones are a rare and exciting opportunity to unite with our community in celebration of our past and to imagine our future together.

 

In Longmont, we will mark these anniversaries by exploring the history of our city and by hosting commemorative events and activities.

 

Check out the Celebrations Calendar below, invite your friends and family to join in the fun, and follow along as we journey through history and celebrate together!

 

Longmont Legacy

with Erik Mason,
Longmont Museum Director

 

Transportation has been an important part of Longmont’s story since its beginning. What is now Hwy 287 began as the Cherokee Trail, linking routes from Arkansas and Oklahoma with the Oregon Trail through Wyoming. By the time Longmont was founded, the Denver Pacific railroad line had cut the travel time between northern Colorado and the East and West Coasts to less than a week.

 

The arrival of the Colorado Central Railroad in Longmont in 1873 was celebrated with champagne and helped to ensure Longmont’s economic success. Roads in Longmont began to be paved in the 1910s, and a paved highway to Denver opened in 1926. While small airstrips existed around Longmont since the 1920s, Longmont’s Municipal Airport, now Vance Brand Airport, opened in October of 1945.

In the Spotlight:

Transportation in Longmont 

 

Captions:

 

        1. Paving project in the area of 1st Ave and Main St circa 1920-1939.
        2. On September 25, 1900, Teddy Roosevelt makes a campaign speech from the back of a train at the 1st and Main Station.
        3. Locally-grown beets are dumped into a train car from a horse-drawn wagon on wooden bridge circa 1900-1920.
        4. A black and white print of a photo from 1920 marked “Gene Miller’s Plane, Longmont.”
        5. Randy Fisher, 15, executes a 180-degree, mid-air turn bicycle trick from a ramp he built at Mountain View Elementary School, 1983. (Greg Ebersole, Longmont Times-Call)

Explore More History with Longmont’s Virtual Tours 

Is Sesquisemiquincentennial a real word?

logo for Longmont celebration of 155, CO150, USA 250 celebrationsIt sure is! You may see “Sesquisemiquincentennial” used around the state of Colorado this year. In 2026, Colorado celebrates its 150th anniversary of statehood (sesquicentennial) and the United State’s 250th anniversary (semiquincentennial) since the signing of the Declaration of Independence. Learn about more celebrations around the state on the History Colorado website.

 

Sesquicentennial + Semiquincentennial = Sesquisemiquincentennial

 

The City of Longmont, in collaboration with the American 250-Colorado 150 Commission, celebrates this unique anniversary year by looking back at Longmont’s 155 years of history. Follow this webpage to learn more about how you can celebrate with us, in person and online!