Climate cues the seasonal timing of key biological events (i.e. phenology), like flowering and seed production of high mountain wildflowers. But which climate variables matter most—snow or temperature? Does this differ by species? MeadoWatch is a citizen science program we launched in 2013 to address these questions. Volunteers collect reproductive phenology data for 16 wildflower species at Mt. Rainier National Park. We seek your support for the 2018 season.