Acorns comprise an important part of the diet of Tamias striatus Linnaeus (eastern chipmunks) and Sciurus spp. (squirrels) in eastern deciduous forests. These species prefer acorns from white oaks (section Quercus) for immediate consumption in the fall, but prefer acorns from red oaks (section Lobatae) for caching for winter use. In the fall, red oak acorns contain higher levels of lipids and tannins than white oak acorns. I tested for changes in lipid and tannin levels of acorns in simulated larderhoards and scatterhoards. Neither lipids nor tannins consistently increased or decreased during storage. Throughout the study, red oak acorns had lipid levels five to ten times greater than those of white oak acorns and tannin levels two to four times greater than those of white oak acorns.