Methane is a potent greenhouse gas, responsible for one-third of climate warming since industrialization. Up to half of annual global methane emissions originate from natural sources including trees and wetland soils; yet, the sources and transport pathways of tree methane emission remain largely unknown and understudied. Potential processes for tree methane emission include within-tree production by methanogens, primarily in the anaerobic heartwood of trees, as well as pressurized flow, transpiration, and/or passive diffusion of soil-originating methane through tree roots, vasculature, or other porous tissues. This research contributes further study on the source of tree methane emissions by analyzing the relationship between tree-stem methane flux, soil methane flux, and environmental conditions. Wetlands are known as net methane sources and uplands as net methane sinks; we therefore hypothesize positive correlations between the two fluxes in the wetland and no significant correlation in the uplands. We used portable trace gas analyzers to measure the stem fluxes of 30 upland and 30 wetland tree, as well as their co-located soil chambers, all located across Prospect Hill of Harvard Forest. Tree fluxes were measured for three minutes using a standard chamber flux technique and soil flux data were collected by a complementary project. Tree methane fluxes were plotted against soil fluxes, as well as soil moisture and temperature, precipitation, vapor pressure deficit, and other environmental variables. The strengths of correlation were determined by the Kendall rank correlation test. Preliminary data support greater correlation between the tree flux and soil flux in the wetland. This research will contribute to greater understanding of the production, transport, and emission pathways of methane through trees. These findings will contribute to resolving major uncertainties in inventories and models of forest methane budgets, which are necessary to inform climate models, predictions, and mitigation efforts.