Office of Liturgy

Liturgical Calendar

Archdiocese of Denver Liturgical Calendar & Notes for 2018

Liturgical Calendar 2018

Catholics are obliged to attend Holy Mass on the following holy days of obligation:

  • Wednesday, August 15, 2018 Solemnity of the Assumption of BVM
  • Thursday, November 1, 2018 Solemnity of All Saints
  • Saturday, December 8, 2018 Solemnity of the Immaculate Conception
  • Tuesday, December 25, 2018 Solemnity of the Nativity of Our Lord


Nota Bene for 2018 Liturgical Calendar

  • Vigil Masses said before 4:00 p.m. will not fulfill one’s Holy Day/Sunday Obligation [1]
  • Observance of the Solemnity of the Ascension of the Lord is transferred to the Seventh Sunday of Easter, May 13, 2018.
  • “The entire celebration of the Easter Vigil takes place at night. It should not begin before nightfall; it should end before daybreak on Sunday” (Roman Missal). On March 31, 2018 according to United States Naval Observatory Sun and Moon Data, Nautical twilight ends at 7:22 p.m. (MDT). The Easter Vigil should not begin until 7:30 p.m.


Liturgical Celebrations Proper to the Archdiocese of Denver:

Tuesday                May 15                  Saint Isidore the Farmer (Obligatory Memorial)
Wednesday           May 16                  Our Lady of Light (Optional Memorial)
Monday                 September 10       St. John Francis Regis (Obligatory Memorial)
Thursday               October 4              Saint Francis of Assisi (Feast)
Saturday                 October 27            Anniversary of Dedication of Cathedral (Feast)
Tuesday                November 6          Blessed Rupert Mayer, S.J. (Obligatory Memorial)
Tuesday                November 13       Saint Frances Xavier Cabrini (Feast)
Wednesday           December 12        Our Lady of Guadalupe (Feast)

Special Commemorations and Days of Prayer Proper to the Archdiocese of Denver:

Monday                January 1              World Justice and Peace & General Needs of Humankind

Monday                January 22            Human Rights and Equality

Wednesday           February 28          Episcopal Ordination, James Francis Cardinal Stafford (1976)

Tuesday                May 15                  Harvest and Fruits of the Earth

Tuesday                May 29                  Appointment, Archbishop Samuel J. Aquila (2012)

Wednesday           July 18                   Installation, Archbishop Samuel J. Aquila (2012)

Saturday                 August 4                Priests and Seminarians

Friday                    August 10             Deacons and Candidates for the Diaconate

Friday                    August 24             Episcopal Ordination, Archbishop Samuel J. Aquila (2001)

Sat.-Wed.              December 8-12   Days of Prayer to the Blessed Virgin Mary*

*under the title of the Immaculate Conception, Principal Patroness of the Archdiocese of Denver.

[1] Universal Norms on the Liturgical Year and the General Roman Calendar nos. 3 and 11. Each and every day is sanctified by the liturgical celebrations of the People of God, especially by the Eucharistic Sacrifice and the Divine Office. The liturgical day runs from midnight to midnight. However, the celebration of Sunday and of Solemnities begins already on the evening of the previous day.