Technical Abstract: Chestnut, Castanea L., trees were propagated and planted in repositories at the Horticulture and Agroforestry Research Center, New Franklin, Missouri in 1996, 2002, 2009 with additional accessions acquired annually. Trees have been pruned, fertilized, irrigated, and pests controlled following University of Missouri chestnut recommendations. For each accession, passport information was recorded and average harvest dates, yield per tree, and average nut weight for mature trees (tree age > 10 years) were calculated and averaged for the 2008, 2009, and 2010 growing seasons. These data were entered into a spreadsheet for all accessions. The staff at the NCGR-Repository, Corvallis, Oregon, uploaded the accession, inventory, and observation records onto the publicly accessible database, the Germplasm Resources Information Network (GRIN).