Mt. Diablo schools poised to reopen all schools for hybrid learning by end of March By Dan McMenamin Mt. Diablo school district to reopen all schools by end of March. Elissa Harrington reports MT. DIABLO, Calif. - The Mt. Diablo Unified School District will reopen all of its schools by March 29 -- and March 25 for students in grades 2 and under -- with a hybrid model of distance learning in the morning and a couple of days per week on campus in the afternoon for students whose families choose that option. All of that is dependent on members of the MDUSD teachers' union Mt. Diablo Education Association ratifying a tentative agreement on a memorandum of understanding announced by both the union and district Tuesday after about 80 hours of bargaining over five days, including 19 hours straight from Monday morning into Tuesday before reaching the agreement at 5 a.m. Tuesday.