<p>Many plant species require highly restricted microhabitats characterized by a specific microclimate. Understanding how a species’ microclimate responds to regional climate may indicate its vulnerability to climatic extremes and climate change. Microclimate data are particularly relevant for threatened species by identifying the critical habitat features supporting their long-term survival. To address this, we examined Haller’s Apple Moss (<i>Bartramia halleriana</i>), a globally distributed bryophyte that is montane and threatened in Canada, as a model for climate-sensitive bryophytes. <i>B. halleriana</i> is a microhabitat specialist, confined to cool and humid crevices of treed rock outcrops in the Rocky Mountains. We used sensors to measure hourly temperature and humidity within <i>B. halleriana</i> and other local microhabitats and related them to regional climate data. <i>B. halleriana</i> microhabitats strongly moderated some effects of regional climate, particularly by maintaining higher humidity for the species. This is relevant given forecasts of warmer and drier conditions across the species’ range. However, different microclimate variables were buffered to varying extents, suggesting the species may rely on some parameters more than others. Tree canopy cover moderated some microclimate variables on rock outcrops where <i>B. halleriana</i> was absent, but no effects were observed within adjacent microhabitats occupied by the species. Whether microhabitats for <i>B. halleriana</i> can function as microrefugia during periods of climate stress will depend on a combination of the species’ climate tolerance and the buffering capacity of microhabitats themselves. Understanding how these local conditions relate to broader climate patterns is essential for guiding conservation strategies for climate-sensitive bryophytes.</p>