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 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 bristlecone pine 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.


I have started posting some photographs and descriptions of various trips, taken for both work and play. Trip reports highlight some wonderful places to camp, backpack, raft, or sample. More reports arriving every so often, please check back occasionally.


My sons make and sell increment core mounts. These are 4 foot (1.22m) long sticks sold in bundles of 30 or 50 at US$1.60 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.


(Larger version of header photo; Powell Plateau ponderosa pine forest, North Rim of the Grand Canyon)