USA NPN National Phenology Network

Taking the Pulse of Our Planet

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Status of Spring

Status of Spring

Cool weather across the Southeast has kept spring from arriving in southern states. Spring has continued its spread across Southwestern states, arriving one-two weeks early in parts of California, Arizona, and Nevada. 

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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


NPN Start of Spring anomaly Jan 17 2018

Spring is arriving in our warmest states

January 17, 2018

The Spring Leaf Index is a synthetic measure of early season events in plants, based on recent temperature conditions. This model allows us to track the progression of spring onset across the country. In Florida, spring is right on time this year compared to a long-term average (1981-2010). In southern California and southwestern Arizona, spring arrived one-two weeks early.    

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Observers Needed

Nature's Notebook 2017 Year in Review preziNature's Notebook 2017 Year in Review

Nature's Notebook observers submitted over 2.9 million records to the National Phenology Database in 2017. These records were submitted by 3,238 observers at 2,239 sites across the country. 

              Learn more about Nature's Notebook »