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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.


Cancelled - The Air We Breathe - On Front Range Air Quality

Free; reservations recommended
7:15 pm

Hear extraordinary people talk about issues of importance to Northern Colorado and beyond.

The Air we Breath: Front Range Air Quality
A conversation with NCAR scientists Frank Flocke and Gabi Pfister
Thursday, April 16

Find out what’s in the air we breathe, how far it travels, and what we know and don’t know about the origin of Front Range pollution. The National Center for Atmospheric Research (NCAR) used aircraft, mobile radars, balloon-mounted sensors, and complex computer simulations to measure local air pollution. Presented in collaboration with NCAR’s Explorer Series and the City of Longmont’s Sustainablity Program. Reserve online

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