This is the exact date to put up your Christmas tree — and it’s not Dec. 1

When to decorate for the holidays has been hotly contested year after year, but experts are finally squashing the debate once and for all.

While decking the halls as early as November can make you merrier, there is an exact day you should assemble your tree — spoiler: it’s not the first of the month.

Dec. 3 is the ideal date to put up the ol’ tannenbaum, according to experts from the UK-based Christmas Tree World.

“Many households like to set up their tree and other festive decorations on the first day of the month to mark the start of the official countdown to the big day,” the unnamed experts told The Sun.

However, holiday lore insists that decor follow the advent calendar, which kicks off this year on Dec. 3 — the fourth Sunday before Christmas — and ends Dec. 24.

Those who dare to test tradition could be haunted by bad luck, according to the superstitious.

As for taking down the Christmas fir, history instructs to wait until after the “Twelve Days” — no partridges, gold rings or drummers necessary — which ends on Jan. 5 this year.

But for seasonal skeptics who would rather ring in some Christmas cheer earlier than advised, clever TikTokers have revealed unique ways to spruce up the tree.

Some are swapping ornaments for bows, others are creating clusters of bulbs using pipe cleaners and a rare few are opting to wrap lights vertically around the tree boughs, as opposed to around the circumference.