The holiday of Purim falls on the Hebrew calendar date of Adar 14. Here are the coinciding secular dates for the upcoming years:

Purim 2018 falls out on:   February 28- March 1

2019:   March 20-21

2020:   March 9-10

Note: The Jewish calendar date begins at sundown of the night beforehand. Thus holiday observances begin at sunset of the first secular date listed (with the Purim Night Megillah reading taking place that evening), and the holiday concludes at nightfall the following day.


See also:

When is Yom Kippur in 2018, 2019 and 2020?
When is Sukkot in 2018, 2019 and 2020?
When is Shemini Atzeret / Simchat Torah in 2018, 2019 and 2020?
When is Chanukah in 2018, 2019 and 2020?
When is Purim in 2018, 2019 and 2020?
When is Passover in 2017, 2018, 2019 and 2020?
When is Shavuot in 2018, 2019 and 2020?
When is the Ninth of Av in 2018, 2019 and 2020?