The climate of Adams places it and the immediate area in two different level three eco-regions: the Cascades eco-region and the Eastern Cascades Slopes and Foothills eco-region. Within these two eco-regions are five level four eco-regions: the Western Cascade Mountain Highlands, Cascade Crest Montane Forest, and Cascades Subalpine/Alpine within the Cascades eco-region and the Yakima Plateau and Slopes and Grand Fir Mixed Forest within the Eastern Cascades Slopes and Foothills eco-region. Adams is unique among the Washington volcanoes in that it is in two level three eco-regions as well as being the only one within the Cascade Crest Montane Forest.