• Winter low temperatures are projected to rise faster here than in any other US-bordering ecoregion — a roughly full USDA zone shift by mid-century under SSP3-7.0 in the continental interior, less near the lake-moderated shorelines.
• Reduced lake-ice coverage is lengthening the lake-effect snow season and amplifying winter precipitation on the leeward shorelines; the late-spring frost window is shrinking but more erratic.
• Sugar maple, eastern hemlock, and yellow birch face cumulative stress; oak-hickory associations and southern species (tulip poplar, sassafras) are advancing northward into their historical range.