A champion tree is the largest tree of a species. These trees are measured using the American Forests points (AF points) which is calculated based on the trunk circumference, the height and the average crown spread to give a point value. Most trees are measured (how to measure trees) and nominated for champion status by ordinary people. The nominations (nomination forms) are sent to the state registry or the Champion Trees National Register. Once the nominations are received, the field work begins to confirm the tree's size before it can be declared a champion.


National Champion(NC), State Champion(SC), Pending Verification (PV), co-champion(-CO)  

under the Oregon Champion Tree Registry, a tree is defined by the following:

  • A native or non-invasive naturalized plant
  • One erect perennial stem or trunk at least 3 inches in diameter at 4.5 feet above the ground
  • A more or less definitely formed crown of foliage
  • A height of at least 13 feet

American Forest Points:

To nominate a tree to become a champion, you need three measurements:

  • Trunk Circumference 
  • Height
  • 1/4 Average Crown Spread

Trees of the same species are compared using the following calculation:

Trunk Circumference (inches) + Height (feet) + ¼ Average Crown Spread (feet) = Total Points