Join us at Yerkes Observatory for an Open House! We’ll have telescopes on the South Lawn, presentations, food, and educational activities for you and your family. Each event has a unique theme and activities, making it a exciting, exploratory experience each time! See below for the themes for the 2025 Open House season. Each event is 2-hour event will take place rain or shine. This does not include the use of the telescopes in the building. Reservations are required. 

Please note: Dates and times are subject to change, and occasionally events may be cancelled. Please check the event website to confirm the latest details.