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:
2016: October 2 (at sundown) - 4
2017: September 20 (at sundown) - 22
2018: September 9 (at sundown) - 11
2019: September 29 (at sundown) - October 1
2020: September 18 (at sundown) - 20
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.