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Emissions from Canadian landfills account for 20 % of national greenhouse gas emissions, a portion of which occur as fugitive emissions. Depending on management factors, significant quantities of landfill gas are emitted during the operational phase and over several decades following landfill closure. Successful landfill reclamation developments depend on low-maintenance solutions to manage fugitive emissions. Designing passive methane oxidation biosystems (PMOBs) to complement landfill covers has become a promising complementary strategy. Achieving year-round methane oxidation in cold climates, requires specific conditions for survival of methanotrophic bacteria (responsible for methane oxidation), including optimal temperature, moisture and sufficient supply of O 2 and CH 4 . The objective of this study was to design, construct and monitor a fully instrumented pilot-scale PMOB capable of abating fugitive methane emissions from a closed landfill in the city of Kitchener, Ontario, now a public park. Factors considered in the design include type of PMOB media, methane loading rates, hydraulic behaviour and ambient temperature. Methane oxidation efficiencies between 73 and 100 % were achieved during the monitoring period. The goal was to develop a long-term solution to mitigate fugitive methane emissions at this closed landfill. Successful mitigation will provide a low-maintenance, high impact technology that could be adopted by the municipality for abatement of CH 4 emissions at other landfills under its management. The results will also be useful to landfill designers, operators, and regulatory bodies. Overall, the PMOB construction and monitoring results supported evidence that the designed PMOB was capable of abating most of the CH 4 loading. The paper describes several steps taken to design, install and operate the PMOB., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2022 Elsevier B.V. All rights reserved.)