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 and is not a comprehensive list of all activities happening around the community. Dates and times of these events are subject to change without notice.

Trash, Recycling, & Composting - Holidays & Events

View via the address-based Online Collection Calendar and sign up for reminders.

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.

Muggle Magic: The Science of Harry Potter

Come learn about the science behind Harry Potter's magic, with CU Science Discovery at the Library.
  • Welcome to Hogwarts! In this exciting program from our friends at CU Science Discovery, budding witches and wizards will get an introduction to Mendelian genetics and then explore the magic that surrounds us every day.
  • Join your fellow wizards-in-training as we learn the science behind Hogwarts charms and potions.
  • We’ll learn how to make different liquids change color, make things disappear and reappear, and make troll boogers, quicksand and boo bubbles!
  • Don’t miss this opportunity to explore the science behind Harry’s wizarding feats – it’s sure to be a magical time.
  • This program is for 3rd through 5th graders only.
  • Registration is required and will open here on Monday, December 3 at 10 am. No email address? Call 303-651-8477 to register by phone.

The Friends of the Longmont Library generously support library programs and services.

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