NH big tree volunteers

New Hampshire Big Tree Program

UNH Cooperative Extension

  • January 1–December 31

This is an ongoing Citizen Science Experience. Contact the sponsoring organization to join in.



High Adventure





NH’s Big Tree Program recognizes and records the state’s biggest champions. From the “William Whipple” horse chestnut in Portsmouth to a black spruce bog in the North Country, dedicated volunteers search the state for the largest examples of individual trees species that grow in New Hampshire.

Ways to participate:

Nominate a Big Tree Champion! This will lead you through the steps for nomination of a potential new State or County Champ. Whether or not you find an actual big tree champion, looking for the biggest trees in your neighborhood can be lots of fun and a great learning experience.

Join the NH Big Tree Team Volunteers! These volunteers work in small, county-based teams to measure trees that have been nominated and submitted to the program. The full group typically meets a few times a year for program updates, continuing education, and to share discoveries and stories.

NH Big Tree Website