The fast of Tisha B'av 2020 (the Ninth of Av) begins at sundown on July 29, and concludes at nightfall on Thursday, July 30.

The fast of Tisha b'Av is observed on the Hebrew calendar date of 9 Av (10 Av, when 9 Av is Shabbat). Here are the coinciding secular dates for the upcoming years:

2021:   July 17-18
2022:   August 6-7
2023:   July 26-27
2024:   August 12-13
2025:   August 2-3

See Also

When is Rosh Hashanah in 2020, 2021, 2022, 2023, 2024, and 2025?
When is Yom Kippur in 2020, 2021, 2022, 2023, 2024, and 2025?
When is Sukkot in 2020, 2021, 2022, 2023, 2024, and 2025?
When is Shemini Atzeret / Simchat Torah in 2020, 2021, 2022, 2023, 2024, and 2025?
When is Chanukah in 2020, 2021, 2022, 2023, 2024, and 2025?
When is Purim in 2020, 2021, 2022, 2023, 2024 and 2025?
When is Passover in 2020, 2021, 2022, 2023, 2024 and 2025?
When is Shavuot in 2020, 2021, 2022, 2023, 2024 and 2025?