Alaska is beginning to experience increased non-native plant establishment, spread, and devaluation of its lands. In response to this increasing threat, we developed a ranking system to evaluate the potential invasiveness and impacts of non-native plants to natural areas in Alaska. This ranking system is designed to be a robust, transparent, and repeatable procedure to aid land managers and the broader public in identifying problematic non-native plants and for prioritizing control efforts. Numerous ranking systems exist, but none are suited to predicting negative impacts to natural systems in Alaska. We created a ranking system that incorporated components from other systems, in which species are ranked by a series of questions in four broad categories: ecosystem impacts, biological attributes, distribution, and control measures. In addition, we include a climate screening procedure to evaluate the potential for establishment in three ecogeographic regions of Alaska. As additional information becomes available, the ranks may change over time. Here we present background and justification for this system and include the ranks of 113 non-native species that are in the state or are likely to be introduced in the future.