The Holy Days of Obligation in the United States

Christmas Day (December 25)

The Solemnity of Mary, Mother of God (January 1)

Ascension Thursday (40 days after Easter)

The Assumption (August 15)

All Saints' Day (November 1)

The Immaculate Conception (December 8)

Christmas is always a holy day of obligation on whatever day it falls. When the feasts of the Assumption, All Saints or the Solemnity of Mary, Mother of God (Jan. 1) are celebrated on a Saturday or Monday, there is no obligation to participate in Mass. The Immaculate Conception remains a holy day of obligation except when December 8 falls on Sunday. Then the feast is transferred to Monday, in which case it is not considered a holy day. However, the faithful are still encouraged to participate at Mass on these days.