You are here

Tree Ring

Diagram of tree-rings                    Extending a chronology through crossdating                    Bristlecone pine

The International Tree-Ring Data Bank (ITRDB) is the world's largest archive of tree ring data, managed by NCDC's Paleoclimatology Branch and the World Data Center for Paleoclimatology. The ITRDB includes raw ring width, wood density, isotope measurements, and site growth index chronologies. Over 3,000 sites on six continents are included. Reconstructed climate parameters are also available for some areas.

Obtaining Data at the World Data Center

Search Datasets

Browse Datasets

Contributing Data

Investigators who wish to contribute their data to the ITRDB can find information on contributing below. Data and study description information can be contributed via the contribution form or by emailing data to

Other Data Archives

Additional sources for data and information on tree rings.