Tisha B'Av 2025. When is tisha b'av in 2025, 2025, 2026, 2027 and 2028? Tisha b'av primarily commemorates the destruction of the first and second temples, both of which were destroyed on the ninth of av (the first by the babylonians in 586 b.c.e.;

This is when we mourn the destruction of the holy temple and our. תשעה באב or ט׳ באב , “the ninth of av,”) is an annual fast day.