When is the end of the Christmas season for Latin Rite Catholics?

When does Christmas really end for Catholics? I know it starts different for most Eastern Orthodox, but for Latin Rite Catholics, like myself, I don't know when it actually is supposed to end. At the very least I know it's over by Ash Wednesday, but there there seem to be very real reasons to celebrate from 1. December 25 - January 1st (the octave of Christmas, ending with the Solemnity of Mary, Mother of God) 2. December 25 - January 6th (the 12 days of Christmas, ending with the Epiphany) 3. December 25 - February 2nd (40 day celebration, ending with the Presentation) So, I guess the real question is who has the stamina to party Catholic style for 40 days, especially after the hubbub leading up to Christmas, but in a liturgical sense, when does the Christmas season end?