This series of eight, geographic region-focused information sheets summarizes documented changes in plant and animal phenology over the past century across the United States.

All information is based on long-term studies (10 years or more) published in the primary scientific literature since 2001. The information sheets have been peer-reviewed through the USGS Fundemental Science Practices process.

	Alaska and the Arctic
	Great Plains - North Dakota, South Dakota, Montana, Wyoming, Nebraska, Kansas, Oklahoma, and Texas
	Hawai‘i and Pacific Islands
	Midwest - Michigan, Ohio, Indiana, Illinois, Wisconsin, Minnesota, Iowa, and Missouri
	Northeast - Maine, New Hampshire, Vermont, Massachusetts, Connecticut, Rhode Island, New York, Pennsylvania, West Virginia, New Jersey, Delaware, Maryland, and the District of Columbia
	Pacific Northwest - Washington, Oregon, and Idaho
	Southeast - Virginia, Kentucky, Tennessee, North Carolina, South Carolina, Georgia, Florida, Alabama, Mississippi, Louisiana, Arkansas
	Southwest - California, Nevada, Utah, Colorado, Arizona, and New Mexico