[nikkival]

We put ours up yesterday. Customs seem to vary from country to country. I pinched this from Wiki -

Traditionally, Christmas trees were not brought in and decorated until Christmas Eve, and then removed the day after twelfth night (i.e., 6 January); to have a tree up before or after these dates was even considered bad luck. Modern commercialisation of Christmas has resulted in trees being put up much earlier; in shops often as early as late October (in the UK, Selfridge's Christmas department is up by early September, complete with Christmas trees). A common tradition in U.S. homes is to put the tree up right after Thanksgiving (the fourth Thursday in November) and to take it down right after the New Year. Some households in the U.S. do not put up the tree until the second week of December, and leave it up until the 6th of January (Epiphany). In Germany, traditionally the tree is put up 24th of December and taken down 7th of January, though many start one or two weeks earlier and in Roman-Catholic areas the tree may be kept until late January. In Australia, the Christmas tree is usually put up on the 1st of December, which occurs about a week before the school summer holidays; except for South Australia, where most people put up their tree after the Adelaide Credit Union Christmas Pageant, which is in early November. Some traditions suggest that Christmas trees may be kept up until no later than the 2nd of February, the feast of the Presentation of Jesus in the Temple (Candlemas), when the Christmas season effectively closes.Superstitions warn of negative consequences if Christmas greenery is not removed by Candlemas Eve.