Rosh Hashanah, the Jewish New Year, falls on the Hebrew calendar dates of 1 and 2 Tishrei. Here are the coinciding secular dates for the upcoming years:
2011: September 28 (at sundown) - 30
2012: September 16 (at sundown) - 18
2013: September 4 (at sundown) - 6
2014: September 24 (at sundown) - 26
2015: September 13 (at sundown) - 15
Note: The Jewish calendar date begins at sundown of the night beforehand. Thus all holiday observances begin at sundown on the secular dates listed, with the following day being the first full day of the holiday. Jewish calendar dates conclude at nightfall.
See also:
When is Yom Kippur in 2011, 2012, 2013, 2014 and 2015?
When is Sukkot in 2011, 2012, 2013, 2014 and 2015?
When is Shemini Atzeret / Simchat Torah in 2010, 2011, 2012, 2013, 2014 and 2015?
When is Chanukah in 2011, 2012, 2013, 2014 and 2015?
When is Purim in 2011, 2012, 2013, 2014 and 2015?
When is Passover in 2011, 2012, 2013, 2014 and 2015?
When is Shavuot in 2011, 2012, 2013, 2014 and 2015?
When is the Ninth of Av in 2011, 2012, 2013, 2014 and 2015?