USA NPN National Phenology Network

Taking the Pulse of Our Planet

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Status of Spring

Status of Spring

Spring continues to spread into the northern Great Plains, arriving in Wyoming, South Dakota, and Montana 1-4 weeks early. Cheyenne, WY is 25 days early.

See the maps

The USA National Phenology Network

The USA National Phenology Network

We bring together citizen scientists, government agencies, non-profit groups, educators and students of all ages to monitor the impacts of climate change on plants and animals in the United States. Learn more about the USA-NPN

What is Phenology?

What is Phenology?

Phenology refers to key seasonal changes in plants and animals from year to year—such as flowering, emergence of insects and migration of birds—especially their timing and relationship with weather and climate.

Learn more about phenology

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USA National Phenology Network


Spring Index leaf comparison 2017 to 2012 and ave

Spring continues to arrive early across the country

March 20, 2017

According to the USA-NPN's Spring Indices, spring is arriving 20 days earlier than a long-term average (1981-2010) in much of the South, Great Plains, Great Basin, mid-Atlantic, Midwest and parts of the Northeast. The Extended Spring Indices are models that predict the onset of early spring plants across the United States. You can see these maps as well as maps of Accumulated Growing Degree Days (AGDD) on the USA-NPN's Phenology Visualization Tool. Read the USGS Top Story here

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Observers Needed

Nectar Connectors badgeSpring campaigns are here!

Nature's Notebook
 are a great way to learn about the phenology of species of special interest, and see how the timing of their phenology changes over time. By collecting data for these campaigns, you also contribute to important scientific research! This year we have a new campaign, Nectar Connectors, that focuses on species of special importance to pollinators. Visit the individual campaign pages to find out how to participate.

Learn more about Nature's Notebook »