What scientific method uses tree rings to study past climate and date wooden objects?

Dendrochronology is the scientific method that uses tree rings to study past climate and date wooden objects.

In many seasonal environments, trees produce one growth ring roughly each year. Wide rings can indicate favorable growing conditions, while narrow rings may reflect drought, cold, insect damage, or other stress. Researchers compare ring-width patterns from living trees, historical timbers, and older wood to build long chronological sequences.

The method is especially useful for dating buildings, archaeological sites, musical instruments, and artworks made from wood. Cross-dating is central: a sample is matched against a reference sequence so that distinctive patterns of wide and narrow rings line up.

Tree rings do not record only climate. A ring may also be influenced by competition, fire, disease, shading, or local soil conditions. Scientists therefore choose samples and statistical methods carefully. Dendrology is the broader study of trees, while dendrochronology specifically concerns time information preserved in tree rings.