Generally occurs on rocky, exposed limestone slopes, talus, and ridges, in high elevation, subalpine to alpine sites. Habitats include gravelly tundra slopes amid scree (often on solifluction lobes on exposed sites, with poorly developed, limestone- and dolomite-derived soils), alpine talus slopes on limestone-derived substrates, and moderately dry alpine meadows and adjacent slopes on northwest aspects, in well-developed, calcareous soils. Also occasionally found on sandstone or granite substrates. Communities include stable tundra associations on solifluction lobes (where co-occurring species include grasses, sedges, and small willows), alpine wetlands (where co-occurring species include Salix brachycarpa, Salix glauca, Betula glandulosa, and mosses), moderately dry to moist alpine meadows, alpine cushion plant communities, and, occasionally, Engelmann spruce woodland to stunted krummholz. However, many sites (e.g. disturbed fell fields) are sparsely vegetated. 2850 - 4350 m.Distribution: Regional endemic of southwest Montana, northwest Wyoming, and central Colorado. Saussurea weberi is a rare plant species known from disjunct occurrences in alpine habitats across the middle Rocky Mountains, from central Colorado to southwestern Montana.