Climate change is dramatically impacting mountain ecosystems around the world. Perhaps the most visceral of these impacts is the ongoing recession of glaciers and perennial snowfields. However, surface glaciers and snowfields are not the only perennial ice in mountain landscapes. Many forms of subsurface ice are also present and likely play an important, albeit understudied, role in water availability and aquatic ecosystem integrity in mountain systems. Rock glaciers—large masses of debris-covered ice that flow downhill—are the most common form of “alternative ice” alpine systems. Theory predicts that surface glaciers and snowfields that are exposed to ambient warming will recede faster than rock glacier that is insulated by debris cover. A limited amount of evidence supports this expectation. Since 2015, we have been monitoring high-alpine streams in the Teton Range, USA fed by three different sources—surface glaciers, rock glaciers, and seasonal snowpack—to understand how different sources may yield differing rates of change amidst rapid climate warming. In 2014 and 2022, LiDAR data was also generated for the entire Teton Range. By pairing our 10+ years of aquatic monitoring data with the physical change inferred from LiDAR, we were able to gain rare insight into the links between physical change to ice sources and downstream ecosystems. Specifically, we found that rock glaciers in the Teton Range have been resistant to climate-induced ice loss while surface ice features have seen dramatic declines. However, these physical changes have not been mirrored in changes to the streams draining these features. At least not yet. For instance, streams fed by seasonal snowpack and small perennial ice features have warmed rapidly during the summer while streams fed by surface glaciers and rock glaciers have remained largely unchanged. Put together, our data provide new insight into the future dynamics of headwater ecosystems as climate change increasingly impacts them.