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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 public archive of tree ring data, managed by NCEI's Paleoclimatology Team and the World Data System for Paleoclimatology.  Oversight is provided by the ITRDB Advisory Committee, chaired by Peter Brewer and including Ulf Büntgen, Ed Cook, Maria Ferrero, Esther Jansma, Jonathan Palmer, and David Stahle. The ITRDB includes raw ring width, wood density, and isotope measurements, plus site growth index chronologies. Over 4,000 sites on six continents are included. Reconstructed climate parameters are also available for some areas.

Obtaining Data at the World Data Center

Search Datasets

  • Tree Ring Search Engine
    ​Search through tree ring studies using Investigator, Title, Location Name, Tree Species, and Latitude/Longitude bounds.
  • Interactive Map
    Select study locations by region, proximity to a point, or text-based attributes.
  • Google Earth Map
    Locate and download tree ring studies using a Google Earth map interface. Google Earth must be installed to use this search tool.
  • Search All Paleoclimatology Data
    Access a free text search of our entire study archive.
  • NCEI Paleo Web Service
    ​Harvest paleoclimatology study metadata records using the NCEI Paleo Web Service.

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 by emailing decadal format data files to  If the data files do not include header information, please also complete the metadata portion of our data contribution template (available at the link below) and email template along with the decadal format data files.

Other Data Archives

Additional sources for data and information on tree rings.