Many plant species are known to undergo masting, where individuals within a species all produce a large amount of seed in a single year, with a sharp drop off in reproduction in the following years. Masting may be beneficial to plants by suppressing seed predator populations in low seed production years, allowing for seeds to escape predation in high seed production years. Masting is likely associated with climate, although this is poorly understood. In this study, I will use herbarium specimens to tackle questions related to masting in five plant species: Tsuga heterophylla, Pseudotsuga menziesii, Thuja plicata, Rubus spectabilis, and Rubus parviflorus. Specifically, I will note the number of cones, seeds or berries on herbarium specimens, as well as specimen size and the year it was collected. I will use these data to 1) examine patterns of masting in focal species as compared to field data from Mount Rainier. I hypothesize that herbarium specimens will show a similar pattern of masting as field data, with trees showing stronger patterns than shrubs. Next, I will use these data to 2) compare masting patterns to annual climate. I hypothesize that warm temperatures lead to masting the following year, and that masting has increased in frequency. Finally, I will 3) assess the relationship between masting and bird species that eat seeds and berries (e.g. grouse, jays), to determine whether masting influences population dynamics of higher trophic levels. I will do so by comparing masting patterns with bird count data from the Audobon Society. I hypothesize that population sizes of birds that rely on seeds and berries will be greater in mast years. This study provides additional information for how we might expect entire ecosystems to be affected by climate change, including resource distribution and population health.