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Rocky Mountain Tree-Ring Research is a nonprofit research organization founded in 1997 by Peter M. Brown. We provide expertise in tree-ring collection, dating, and analysis to answer a variety of basic and applied questions in fire and forest history, climatology, and ecosystem ecology, restoration, and management. 

The basics page contains some practical information on sampling, sample preparation, and how to keep your increment borers clean and sharp.

RMTRR is also the home of OLDLIST, a database of known (or, in some cases, suspected) maximum ages that individual trees of different species have attained at the time of sampling from around the world.  OldList was recently updated to include a new record holder over 5000 years old  Also have a look at the Eastern OLDLIST, focused on old trees in the eastern US and maintained by Dr. Neil Pederson of Harvard Forest. 

We make and sell increment core mounts. These are 4 foot (1.22m) long sticks sold in bundles of 30 or 50 at US$1.40 per stick.  Note that the groves are cut for 4.3mm cores, but will fit 5.1mm cores by trimming the shoulders down slightly or using more glue. Please contact me to order, and we can accept credit cards or checks for payment.

NEW! I have started posting some photographs from various trips, both work and play. I am selling photographs through a new company, Peter Mark Brown Photography. Please check out my trip reports for some pretty pictures and descriptions of neat places to go. More coming soon! 



A fire-scarred ponderosa pine from Mount Rushmore National Memorial, Black Hills, South Dakota
(click for a larger version)

For further information:
Dr. Peter M. Brown, Director
Rocky Mountain Tree-Ring Research
2901 Moore Lane, Ft. Collins, CO 80526 USA

Ph: 970.229.9557
E-mail: pmb [at] rmtrr [dot] org

Page last updated: April 2016
Rocky Mountain Tree-Ring Research, Inc. All rights reserved.