In 1937 A. E. Douglass, founder of the modern science of dendrochronology, established the Laboratory of Tree-Ring Research at the University of Arizona. The Tree-Ring Lab is recognized worldwide as a preeminent center for the advancement of tree-ring techniques and the broad application of dendrochronology in the social and environmental sciences.

Friday, September 2

Thursday, September 8

Monday, September 12


David Frank in front of the giant sequoia cross section in the Bannister Building lobby
The Tree-Ring Lab welcomes its new director, David Frank. Read more...
The tree in its Pindus Mountains setting.
Tree-Ring Lab researchers were part of the group that identified the oldest known tree in Europe. Read more...
Maps of changes in tree growth rates in North America under changing climate and various water use efficiency assumptions.
Tree-ring data showing how forests have grown in the past help forecast their future decline under a changing climate. Read more...
Sheppard holding the award plaque
Outstanding Forester of the Year award to the LTRR's Paul Sheppard. Read more...
The elgant conference logo, turning the map of the Americas into a tree.
The LTRR featured prominently in awards distributed at the Ameridendo2016 conference in Argentina. Read more...
Canyon walls near Nankoweap reflected in a calm stretch of the river
Connie Woodhouse and Kiyomi Morino of the LTRR are authors on a paper showing that temperature modulates the influence of rain and snowfall on Upper Colorado River Basin streamflow. Read more...