The Season of Advent 
Begins four Sundays before Christmas.  

The Season of Christmas 
Christmas Eve through Epiphany (January 6th)

The Season of Epiphany 
The Sundays and weekdays after Epiphany (January 6th), often called ordinary time.  

The Season of Lent
Starts on Ash Wednesday, forty days before Easter Day (not including Sundays).  

Holy Week 
The week before Easter Day, starting on Palm Sunday, with Maundy Thursday, Good Friday, and Holy Saturday as the focus of observation. 

The Season of Easter 
Easter is celebrated for fifty days, starting on Easter Sunday.  

Pentecost
Pentecost is fifty days after Easter and marks the descent of the Holy Spirit upon the Church.

Ordinary Time/Season After Pentecost 
Trinity Sunday - First Sunday after Pentecost
All Saints Day: November 1
Christ the King: Last Sunday in Pentecost