Citywide Calendar

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Welcome to Longmont's Calendar of Events!

The events listed on this calendar are City of Longmont sponsored events. This is not a comprehensive list of all activities happening around the community. Dates and times of these events are subject to change without notice.

Holiday Closures

Trash, Recycling, & Composting - Holidays & Events

Other Community Events

  • To view other events being held around Longmont, please visit the Longmont visitors bureau events calendar at

Subscribe to the City Calendar

  • To get events emailed to you directly, sign up for the Calendar eNotifications and then select the Calendar categories.


Musk Thistle Field Day

Join us for the Musk Thistle Field Day!

Musk thistle (Carduus nutans) is a problematic noxious weed in Boulder County. It can produce thousands of seeds per plant and outcompete native plants -- and it is dropping it's seeds now!

Come spend the morning in a beautiful remnant prairie at Sandstone Ranch and help control musk thistle by cutting seed heads and collecting them in trash bags. We'll also spend time identifying native grasses and wildflowers. Meet in the upper parking lot near the Visitor's Center.

Register through JoinUs, the new Parks, Open Space and Trails volunteer portal.

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