This dataset contains field measurements of vegetation from the (1) Adirondack Sugar Maple Project (ASM), and (2) Buck Creek North and Buck Creek South Watersheds. The ASM data, collected in 2009 in 20 Adirondack watersheds (2 or 3 0.10 ha plots per watershed), are comprised of general plot characteristics, tree species identification and diameter at breast height (DBH) for all trees greater than 10 cm DBH, canopy position and health ratings, common and scientific names, and species identification and counts for saplings and seedlings. In Buck Creek North Tributary Watershed and Buck Creek South Tributary Watershed, near Inlet, New York, all trees greater than 5 cm DBH were identified in 15 circular plots (245 square meters) distributed within each watershed. Measurements were made in 2000, 2005, 2010 and 2015. In all plots, saplings less than 5 cm DBH and taller than 1 meter were also identified to species and counted in 2010 and 2015. Data are posted in EXCEL 2013 and comma-delimited CSV format. Site locations (latitude, longitude) are provided in a downloadable file and dynamic ArcGIS REST service at the USGS Sciencebase DOI link.