Denver Zoo Free Days

Denver Zoo is offering seven (7) Community Free Days throughout 2023 for anyone in our community. To provide the best experience for all of our guests, we are offering a limited number of tickets for each Free Day, using an online lottery system. Anyone who wants to attend a Free Day must register online during the open lottery period for a chance to obtain up to five (5) vouchers for its corresponding Free Day. Follow the steps below to enter—best of luck, and hope to see you this year!


Free Day tickets are only available through this system, so we no longer accept  walk-ins on Free Days.

Friday, January 6
Sunday, January 22

Sunday, February 5
Sunday, April 9

Saturday, October 7

Tuesday, November 7

Sunday, November 12 


OPENS Sunday, March 26
CLOSES Saturday, April 1

Our Free Day Lottery

Here’s how to enter—and what to do next!

Step 1: Check the chart below for lottery open dates. 

Step 2: During the lottery registration period, click here to enter the lottery. The lottery will be active only during the open registration period.

Step 3: Winners will be notified by email, so check your inbox daily for your vouchers. 

Step 4: If you win, you MUST click the link in the email to reserve your tickets and entry time. 

Step 5: On your designated Free Day, bring your tickets to the Zoo—and have a great day! 

THE FINE PRINT: You may register to win (5) free tickets per transaction. Limit one registration per person, per Free Day. Vouchers and tickets are available ONLINE ONLY. No tickets will be available at the Zoo gate. All guests must have a timed ticket for entry, including children 2 and under. Tickets are valid only for the specific Free Day and entry time you reserved.

2023 Denver Zoo Free Days

Key Dates for Lottery + Winner Notification





Friday, January 6 

Monday, December 26 

Thursday, December 29 

Friday, December 30 

Sunday, January 22 

Sunday, January 8 

Saturday, January 14 

Monday, January 16 

Sunday, February 5 

Sunday, January 22 

Saturday, January 28  

Monday, January 30 

Sunday, April 9 

Sunday, March 26 

Saturday, April 1 

Monday, April 3 

Saturday, October 7 

Saturday, September 23 

Friday, September 29 

Monday, October 2 

Tuesday, November 7 

Tuesday, October 24 

Monday, October 30 

Tuesday, October 31 

Sunday, November 12 

Sunday, October 29 

Saturday, November 4 

Monday, November 6 

Note to Denver Zoo Members

Please Reserve Tickets Using Your Membership

If you’re a Denver Zoo member, fear not—we’re saving your spot! If you’d like to visit on a Free Day, simply use your membership to reserve your tickets as usual. As always, we’re looking forward to seeing you…and thank you for your support.