Seaweed aquaculture has increased significantly in recent decades and its important role in mitigating the levels of greenhouse gas (GHG) emissions has been recognised. The temperate red alga Asparagopsis armata is native to southern Australia and contains the key secondary metabolite, bromoform, which reduces methane production when incorporated into the diet of ruminants. Given globally, methane production contributes to 14% of GHG emissions, and 9.2% within Australia alone, Asparagopsis spp. have been identified as having a large commercial potential and several Australian-based companies are now growing it. However, a lack of understanding of the variation in its distribution, abundance, and reproduction creates a risk to its commercial potential. We undertook targeted surveys across 15 sites for 12 months to determine the spatial and temporal patterns in these metrics for A. armata around Tasmania. At all sites we used towed video to assess the presence of A. armata across a large spatial area, complemented by focussed quantitative assessments of the percentage cover and biomass on SCUBA. Our work has highlighted the large spatial and temporal variation in these metrics for A. armata and provides an important baseline for the management and harvest of A. armata seed-stock around Tasmania.