Kelp species (Order Laminariales) are currently almost exclusively cultivated in temperate coastal waters of the North Atlantic and North Pacific and mostly in sheltered sites. There is a strong drive in several countries to expand aquaculture further offshore co-occurring with a rapid change of the conditions under which this activity will be practiced due to climate change. At the dawn of these profound changes, a global review of the current status of kelp cultivation in wave-exposed environments can serve as a benchmark for future developments. This chapter presents an inventory and description of kelp commercial farms currently in operation in temperate-exposed waters. The inventory is based on 80+ high-resolution aquaculture lease maps, most of them available as Web-GIS applications, that cover the entire study area except for a few countries. The number of exposed sites and the leased area are tallied by region, country and production method. The “longline” is the production structure used in all sites inventoried. Longline design and farm layout in exposed farms as well as structural damage and loss of cultured biomass due to hydrodynamic forces are reviewed. Information gaps, strengths and weaknesses of current practices, and recent R&D projects are discussed.