San Dimas High School 2025-2026 Calendar https://sandimashigh.tandem.co/ Key dates for San Dimas High School. en-us 8/11/25 - 8/12/25 School Check In https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62650 62650-sandimashigh@intand.com 8/18/25 First Day of School https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62652 62652-sandimashigh@intand.com 8/20/25 Collaboration Day (2:25pm Release) https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62651 62651-sandimashigh@intand.com 8/25/25 Back to School Night https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62653 62653-sandimashigh@intand.com 8/29/25 Minimum Day (12:59pm Release) https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62654 62654-sandimashigh@intand.com 9/1/25 Labor Day (No School) https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62633 62633-sandimashigh@intand.com 9/3/25 Collaboration Day (2:25pm Release) https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62655 62655-sandimashigh@intand.com 9/12/25 Rally Schedule https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62656 62656-sandimashigh@intand.com 9/17/25 Collaboration Day (2:25pm Release) https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62657 62657-sandimashigh@intand.com 9/26/25 Renaissance Schedule https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62972 62972-sandimashigh@intand.com 10/1/25 Collaboration Day (2:25pm Release) https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62659 62659-sandimashigh@intand.com 10/3/25 Staff Development Day (No School) https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62658 62658-sandimashigh@intand.com 10/10/25 First Quarter Ends https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62661 62661-sandimashigh@intand.com 10/13/25 Indigenous Peoples Day https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62634 62634-sandimashigh@intand.com 10/15/25 Collaboration Day (2:25pm Release) https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62660 62660-sandimashigh@intand.com 10/16/25 Great Shakeout https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62744 62744-sandimashigh@intand.com 10/16/25 Rally/Great Shakeout Schedule https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62662 62662-sandimashigh@intand.com 10/17/25 Minimum Day (12:59pm Release) https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62663 62663-sandimashigh@intand.com 10/30/25 Minimum Day (12:59pm Release) https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62664 62664-sandimashigh@intand.com 10/30/25 Parent Conferences https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62665 62665-sandimashigh@intand.com 10/31/25 Halloween https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62635 62635-sandimashigh@intand.com 10/31/25 No School https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62666 62666-sandimashigh@intand.com 11/2/25 Daylight Saving Time Ends https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62637 62637-sandimashigh@intand.com 11/5/25 Collaboration Day (2:25pm Release) https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62667 62667-sandimashigh@intand.com 11/11/25 Veteran's Day (No School) https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62636 62636-sandimashigh@intand.com 11/14/25 Rally Schedule https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62974 62974-sandimashigh@intand.com 11/18/25 Minimum Day (12:59pm Release) https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62683 62683-sandimashigh@intand.com 11/18/25 Wellness Day https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62684 62684-sandimashigh@intand.com 11/19/25 Collaboration Day (2:25pm Release) https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62668 62668-sandimashigh@intand.com 11/24/25 - 11/28/25 Thanksgiving Break (No School) https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62669 62669-sandimashigh@intand.com 11/27/25 Thanksgiving https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62638 62638-sandimashigh@intand.com 12/3/25 Collaboration Day (2:25pm Release) https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62670 62670-sandimashigh@intand.com 12/17/25 Collaboration Day (2:25pm Release) https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62671 62671-sandimashigh@intand.com 12/18/25 Finals-Block Schedule (Periods 1, 2, 3, 0) https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62672 62672-sandimashigh@intand.com 12/18/25 Minimum Day (12:55pm Release) https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62673 62673-sandimashigh@intand.com 12/19/25 Finals-Block Schedule (Periods 4, 6, 7, 8) https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62674 62674-sandimashigh@intand.com 12/19/25 Minimum Day (12:55pm Release) https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62675 62675-sandimashigh@intand.com 12/19/25 Second Quarter Ends https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62676 62676-sandimashigh@intand.com 12/22/25 - 12/26/25 Winter Break (No School) https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=64227 64227-sandimashigh@intand.com 12/25/25 Christmas Day https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62639 62639-sandimashigh@intand.com 12/29/25 - 1/2/26 Winter Break (No School) https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=64228 64228-sandimashigh@intand.com 1/1/26 New Year's Day https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62640 62640-sandimashigh@intand.com 1/7/26 Collaboration Day (2:25pm Release) https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62677 62677-sandimashigh@intand.com 1/19/26 Martin Luther King Day (No School) https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62641 62641-sandimashigh@intand.com 1/21/26 Collaboration Day (2:25pm Release) https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62678 62678-sandimashigh@intand.com 1/30/26 Rally Schedule https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62976 62976-sandimashigh@intand.com 2/4/26 Collaboration Day (2:25pm Release) https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62679 62679-sandimashigh@intand.com 2/9/26 Lincoln's B-Day Observed (No School) https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62681 62681-sandimashigh@intand.com 2/14/26 Valentine's Day https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62642 62642-sandimashigh@intand.com 2/16/26 President's Day https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62643 62643-sandimashigh@intand.com 2/16/26 President's Day (No School) https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62682 62682-sandimashigh@intand.com 2/18/26 Collaboration Day (2:25pm Release) https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62680 62680-sandimashigh@intand.com 2/25/26 Renaissance Schedule https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=64452 64452-sandimashigh@intand.com 3/3/26 Future Saints Night/Open House https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62685 62685-sandimashigh@intand.com 3/4/26 Collaboration Day (2:25pm Release) https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62686 62686-sandimashigh@intand.com 3/5/26 Minimum Day (12:59pm Release) https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62765 62765-sandimashigh@intand.com 3/6/26 No School https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62688 62688-sandimashigh@intand.com 3/8/26 Daylight Saving Time Begins https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62644 62644-sandimashigh@intand.com 3/17/26 St. Patrick's Day https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62645 62645-sandimashigh@intand.com 3/18/26 Collaboration Day (2:25pm Release) https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62687 62687-sandimashigh@intand.com 3/20/26 Rally Schedule https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62977 62977-sandimashigh@intand.com 3/20/26 Third Quarter Ends https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62689 62689-sandimashigh@intand.com 3/23/26 Fourth Quarter Begins https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=64427 64427-sandimashigh@intand.com 3/30/26 - 4/3/26 Spring Break (No School) https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62690 62690-sandimashigh@intand.com 4/5/26 Easter https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62646 62646-sandimashigh@intand.com 4/8/26 Collaboration Day (2:25pm Release) https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62691 62691-sandimashigh@intand.com 5/1/26 National Signing Day https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62692 62692-sandimashigh@intand.com 5/5/26 Cinco De Mayo https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62647 62647-sandimashigh@intand.com 5/19/26 Renaissance Schedule https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62795 62795-sandimashigh@intand.com 5/20/26 Minimum Day (12:59pm Release) https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62694 62694-sandimashigh@intand.com 5/20/26 SDCP Presentations https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62698 62698-sandimashigh@intand.com 5/21/26 Minimum Day (12:59pm Release) https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62695 62695-sandimashigh@intand.com 5/21/26 SDCP Presentations https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62697 62697-sandimashigh@intand.com 5/22/26 Minimum Day (12:59pm Release) https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62696 62696-sandimashigh@intand.com 5/25/26 Memorial Day (No School) https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62648 62648-sandimashigh@intand.com 5/27/26 Collaboration Day (2:25pm Release) https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62693 62693-sandimashigh@intand.com 5/29/26 Senior Check Out https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62706 62706-sandimashigh@intand.com 6/3/26 Finals Block Schedule (Periods 1, 2, 3, 0) https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62704 62704-sandimashigh@intand.com 6/3/26 Minimum Day (12:55pm Release) https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62702 62702-sandimashigh@intand.com 6/4/26 Finals Block Schedule (Periods 4 , 6, 7, 8) https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62705 62705-sandimashigh@intand.com 6/4/26 Fourth Quarter Ends https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62701 62701-sandimashigh@intand.com 6/4/26 Minimum Day (12:55pm Release) https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62703 62703-sandimashigh@intand.com 6/8/26 Summer School Begins https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62700 62700-sandimashigh@intand.com 6/19/26 Juneteenth (No School) https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62699 62699-sandimashigh@intand.com 7/4/26 Independence Day (No School) https://sandimashigh.tandem.co/index.php?type=key_date&action=details&id=62649 62649-sandimashigh@intand.com