On November 15, 2008 it held a founding convention in Moncton where the membership adopted a constitution, and a charter of principles to guide the development of policies and platforms.

Established during a Fredericton meeting, the party seized the opportunity presented by the province's decline in NDP presence, positioning itself as an alternative for such voters.

[5][6] In September 2009, the Green Party acclaimed its first leader, former Liberal organizer and candidate Jack MacDougall.

[9] In the 2014 election, the Greens secured their first ever seat in the Legislative Assembly of New Brunswick and became the second Canadian Green party to win a provincial legislative seat,[10] with leader David Coon having defeated the incumbent Progressive Conservative Energy Minister Craig Leonard in the Fredericton South riding.

Some of Coon's key messages at the time included his opposition to fracking as well as the Energy East pipeline.