A trees growth rate changes in a predictable pattern throughout the year in response to seasonal climate changes, resulting in visible growth rings. Each ring marks a complete cycle of seasons, or one year, in the trees life.
Is a tree ring one year?
Tree Rings Indicate Age of the Tree A one-year cycle is comprised of a light pale wood that grew at the start of the year and a dark wood that grew at the end of the year. When a tree is cut, you will notice alternating light and dark wood rings. Count the dark rings, and you will get the trees age.
How do I know how old a tree is?
To do this, you need to multiply the diameter of the tree by its species-specific growth factor. First, you measure the circumference of the trunk in inches. Next, calculate the diameter and then multiply the diameter by the species average growth factor. Now you will have a rough age of the living tree!