[9] Following MacLaren's defection, the Trillium Party saw an increase in media attention as this marked the first time a party other than the Liberals, Progressive Conservatives, or New Democrats had maintained representation at Queen's Park since Robert Wayne Gibson sat as a Liberal-Labour MPP for Kenora in 1966.

[10] The party's brief presence at Queen's Park ended when MacLaren, running in the new riding of Kanata—Carleton, was unseated at the 2018 provincial election.

After expressing support for the Yellow Vest and "United We Roll" protests, the party's website stopped being updated.

[14][15][16] Trillium Party policy called for monthly health care statements, a reduction in time between application and granting of practising licences for medical professionals from overseas, involving parents in education issues, and increasing financial support for police.

Additional policies included introducing legislation on referendums, addressing corruption through the office of the Auditor General, implementing whistle-blower protection legislation, allowing free votes by MPPs in the legislature, and opposing updates to the province's sexual education curriculum.