Large trees are irreplaceable assets in our urban forest. They provide enormous economic and environmental benefits that only increase over the years.

The State of Maryland has been measuring big trees since 1925, and boasts the oldest program in the nation. The point system now used across the country was developed by Maryland’s first forester, Fred Besley. A tree receives one point for every inch of circumference as measured 4.5 feet above the ground, one point for every foot of height, and 1/4 point for each foot of average canopy spread.

In Baltimore City, one of Tree Baltimore's partner organizations, The Baltimore City Forestry Board, seeks out big trees and records official measurements. You can explore our notable tree map to learn more about these leafy giants.

Think you know of a new big tree? You can also nominate the next city or state champ!

For nominations of private property trees, visit Maryland Big Trees. For nominations of trees on city property in the right-of-way along our streets or in public parks, scroll down and fill out the form below.