In Atlantic Canada, freshwater “marsh impoundments” have been constructed since the 1970s by building dykes on agricultural lands created by draining salt marshes. While intended to mitigate regional wetland loss and provide waterfowl habitat, it is not certain if they can also serve as natural climate solutions. Assessment of the effectiveness of a natural climate solution requires, among other things, evaluating greenhouse gas emissions. Here we report on CH₄  fluxes in five marsh impoundments in New Brunswick and Nova Scotia, ranging in age from 11 to 53 years. Each impoundment is fed by rainwater with no surface water inputs. We measured greenhouse gas fluxes in the emergent vegetation, primarily cattail (Typha latifolia), in spring, summer, fall and even winter when waters were frozen. Our sampling method utilized modular, ~1 m long chambers stacked to fit cattail heights. These results will eventually be combined with data from other research on greenhouse gas flux from open waters and sediment carbon storage to provide insights into the trade-offs of wetland restoration.