Holidays begin at sundown

Rosh HaShanah 5772
Evening of September 28, 2011

Yom Kippur
Evening of October 7, 2011

Sukkot
Evening of  October 12-19, 2011

Shemini Atzeret
October 20, 2011

Simhat Torah
October 21, 2011

Hanukkah (Chanukah)
December 20-28, 2011

Tu Bishvat
February 8, 2012

Purim
March 29, 2012

Passover (Pesach)
Evening of April 6-14, 2012

Holocaust Remembrance Day (Yom HaShoah)
April 19, 2012

Israel Memorial Day (Yom HaZikaron)
April 25, 2012

Israel Independence Day (Yom HaAtzmaut)
April 26, 2012

Lag B'Omer
May 10, 2012

Shavuot
Evening of May 26-28, 2012

Tisha B'Av
July 29, 2012