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Phenology Calendar Resources

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Research, Resources, and Further Reading for the 2026 Phenology Calendar
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A Phenological Record for Sauk and Dane Counties, Wisconsin, 1935-45
Aldo Leopold and Sara Elizabeth Jones, Ecological Monographs, 1947

Climatic Effects on Year-to-Year Variations in Migration Phenology: A WSO Research Project
Stanley A. Temple and John R. Cary, The Passenger Pigeon, 1987

Phenological Changes Reflect Climate Change in Wisconsin
Nina Leopold Bradley et al., Proc. Natl. Acad. Sci. USA, 1999

Record-breaking Early_ Flowering in the Eastern United States
Elizabeth R. Ellwood et al., PLOS One, 2013

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