The average height of a Christmas tree is between 6 and 8 feet, although some can be as tall as 12 feet or even taller. The height of a Christmas tree depends on the species, the age, and the growing conditions. Fir trees, such as the Douglas Fir or the White Fir, are typically taller than pine trees, which tend to be more compact and bushy. The height also depends on how much sunlight the tree receives, with trees grown in full sun tending to be taller than those grown in shade.