One last detail, far from festive but essential: safety. A dry natural tree can become a fire hazard, especially with old light strings. It is worth checking your smoke detectors, your insurance coverage, and the condition of your decorations before the big day.
In the end, there is no universal rule. Some trees already shine proudly in living rooms. Others will wait a week or two. The right date is the one that fits your traditions, your home, and your budget. What matters most is the moment the lights come on and the house finally feels like Christmas.