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!
Celebrations Calendar
Longmont Legacy
with Erik Mason,
Longmont Museum Director
From the earliest days in the community, food production helped shape Longmont’s economy. Just one year after the town was founded, a small flour mill opened, beginning a long tradition of processing crops for commercial distribution. Over time, that tradition grew to include the Empson Cannery, Great Western Sugar Factory and Longmont’s turkey processing industry.
These businesses became important parts of Longmont’s economy and community, producing everything from canned vegetables and sugar to turkeys that went from the egg to the dinner table. Some industries eventually closed or moved on, but food production continued to evolve.
Today, Smucker’s manufactures Uncrustables at its Highway 119 plant, continuing a food production tradition that began more than 150 years ago.
In the Spotlight:
Longmont’s History of Food Production
Captions:
-
-
-
- A black and white photograph of large mill with “Colo. & So.” boxcar in front. Written on back on the photograph in blue ink is “Denio Mill, Old Mill Park.”
- Photo of the Empson Cannery taken between 1910-1930.
- Black and white photo of a huge wall of cans at the Empson cannery. 1907-1910. Photo by Thomas A. Landers
- Hand-tinted postcard of the Beet Sugar Factory, Longmont, Colorado, postmarked 1912.
- G.W. Sugar factory with beets piled alongside wagons and men unloading by hand. 1900-1920. Photo by Charles W. Boynton.
-
-
Explore More History with Longmont’s Virtual Tours
Women of Longmont Virtual Tour
Discover the lives of influential women who helped make Longmont the vibrant, community-focused town it is today.
Historic Downtown Virtual Tour
Enjoy historic photographs, text, and audio recordings that virtually walk you through more than a dozen downtown locations.
Latino History Virtual Tour
This tour explores Longmont’s Latino neighborhoods and heritage while honoring some of the many sacrifices, challenges and successes experienced by this remarkable community.
Is Sesquisemiquincentennial a real word?
It 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!