University Of Chicago Laboratory Schools 2025-2026 Calendar https://ucls.tandem.co/ Key dates for University Of Chicago Laboratory Schools. en-us 8/19/25 - 8/21/25 New Faculty Orientation https://ucls.tandem.co/index.php?type=key_date&action=details&id=104552 104552-uchicagolaboratoryschools@intand.com 8/25/25 - 8/29/25 Planning Week (Blackout Date) https://ucls.tandem.co/index.php?type=key_date&action=details&id=104551 104551-uchicagolaboratoryschools@intand.com 8/30/25 - 9/1/25 Labor Day Weekend (Blackout Date) https://ucls.tandem.co/index.php?type=key_date&action=details&id=88696 88696-uchicagolaboratoryschools@intand.com 9/2/25 First Day of Classes https://ucls.tandem.co/index.php?type=key_date&action=details&id=88706 88706-uchicagolaboratoryschools@intand.com 10/4/25 - 10/5/25 Comer Race Weekend (Blackout Date) https://ucls.tandem.co/index.php?type=key_date&action=details&id=104553 104553-uchicagolaboratoryschools@intand.com 10/13/25 October Break - No School https://ucls.tandem.co/index.php?type=key_date&action=details&id=88697 88697-uchicagolaboratoryschools@intand.com 10/31/25 PD Day (Blackout Date) https://ucls.tandem.co/index.php?type=key_date&action=details&id=88698 88698-uchicagolaboratoryschools@intand.com 11/22/25 - 11/30/25 Thanksgiving Break (Blackout Date) https://ucls.tandem.co/index.php?type=key_date&action=details&id=88699 88699-uchicagolaboratoryschools@intand.com 12/20/25 - 1/4/26 Winter Break (Blackout Date) https://ucls.tandem.co/index.php?type=key_date&action=details&id=88700 88700-uchicagolaboratoryschools@intand.com 1/19/26 MLK Day (Blackout Date) https://ucls.tandem.co/index.php?type=key_date&action=details&id=88701 88701-uchicagolaboratoryschools@intand.com 2/16/26 PD Day (Blackout Date) https://ucls.tandem.co/index.php?type=key_date&action=details&id=88702 88702-uchicagolaboratoryschools@intand.com 3/7/26 - 3/22/26 Spring Break https://ucls.tandem.co/index.php?type=key_date&action=details&id=88703 88703-uchicagolaboratoryschools@intand.com 4/17/26 PD Day (Blackout Date) https://ucls.tandem.co/index.php?type=key_date&action=details&id=88707 88707-uchicagolaboratoryschools@intand.com 4/20/26 April Break - No School https://ucls.tandem.co/index.php?type=key_date&action=details&id=88708 88708-uchicagolaboratoryschools@intand.com 5/1/26 - 5/3/26 Alumni Weekend (Blackout Date) https://ucls.tandem.co/index.php?type=key_date&action=details&id=104554 104554-uchicagolaboratoryschools@intand.com 5/15/26 - 5/17/26 ROM (Blackout Date) https://ucls.tandem.co/index.php?type=key_date&action=details&id=106404 106404-uchicagolaboratoryschools@intand.com 5/23/26 - 5/25/26 Memorial Day Weekend (Blackout Date) https://ucls.tandem.co/index.php?type=key_date&action=details&id=88704 88704-uchicagolaboratoryschools@intand.com 6/6/26 UChicago Convocation (Blackout Date) https://ucls.tandem.co/index.php?type=key_date&action=details&id=105536 105536-uchicagolaboratoryschools@intand.com 6/11/26 Last Day of Classes https://ucls.tandem.co/index.php?type=key_date&action=details&id=88709 88709-uchicagolaboratoryschools@intand.com 6/19/26 Juneteenth (Blackout Date) https://ucls.tandem.co/index.php?type=key_date&action=details&id=88711 88711-uchicagolaboratoryschools@intand.com 6/22/26 First Day of Summer Lab https://ucls.tandem.co/index.php?type=key_date&action=details&id=88712 88712-uchicagolaboratoryschools@intand.com 7/3/26 Independence Day Observed (Blackout Date) https://ucls.tandem.co/index.php?type=key_date&action=details&id=88705 88705-uchicagolaboratoryschools@intand.com 7/31/26 Last Day of Summer Lab https://ucls.tandem.co/index.php?type=key_date&action=details&id=88713 88713-uchicagolaboratoryschools@intand.com