2024 City Nature Challenge Events

Connecting People and Nature

Placeholder Image — COMMUNITY CONSERVATION The annual City Nature Challenge depends on community scientists and volunteers to observe and record plant and wildlife species. © Erich Schlegel

What’s the City Nature Challenge?

Become a community scientist by capturing observations of biodiversity from April 26 - 29, 2024, using the iNaturalist app. Join the iNaturalist project for your city or area, and head outside to snap photos of plants, fungi and wildlife. Don’t let the word “city” fool you—observations can be made anywhere, including your own backyard.

Learn More iNaturalist Help

2018 BioBlitz High Five AUSTIN, TX - APRIL 28, 2018 - The Nature Conservancy of Texas BioBlitz 2018 along Waller Creek. © Erich Schlegel

Project Overview

iNaturalist Project Hub

Find all of the TNC-related iNaturalist projects for the 2024 City Nature Challenge.

View Projects

Additional Resources

Learn more about how to make observations on iNaturalist and discover the educational tools available to engage students of all ages.

Making Observations Educator's Toolkit

Visitors at Clymer Meadow Visitors identify plants with their phones during a wildflower tour at Clymer Meadow Preserve. © Justin Parker

Places We Protect

Explore TNC Preserves with Public Access

Looking for a nature preserve to hike, explore and make observations in during the City Nature Challenge? Check out this map of TNC properties, and select the "open to public" button to locate a natural area with public access near you.

Find a Public Preserve

How to Participate

Find bioblitz events to attend and make observations, or join an iNaturalist project for your area and contribute your observations on your own. You don't have to attend an event to participate; observations can be made from your backyard, a local park or any other outdoor location in your area! See events and iNaturalist projects below. All observations should be made from April 26 - 29, 2024.

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Colorado

Join us for an exciting bioblitz competition documenting and identifying the vast biodiversity of Colorado.

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DC Metro Area

Use this interactive map to find an in-person event in the DC Metro Area; click on the red pins for event details and more info.

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Greater Phoenix, Arizona

Help TNC and partners document biodiversity in the Valley of the Sun by making as many observations of organisms as possible.

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Hobe Sound, Florida

Explore TNC's Blowing Rocks Preserve during a bioblitz hike on Sunday, April 28th from 10:00am-noon.

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Orange County, Florida

Join TNC Florida in this exciting challenge to observe and record the biodiversity of Florida's Orange County.

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Polk County, Florida

Register for a guided event, hosted by TNC and partners, to observe and record the biodiversity found in Florida's Polk County.

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Central Ohio

Join your fellow community scientists in central Ohio for a weekend-long bioblitz documenting the things we encounter in nature.

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Bend, Oregon

Attend a City Nature Challenge event hosted by our conservation partners in Bend, Oregon.

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Eugene, Oregon

Join TNC for a birdwatching event at Willow Creek to identify different species for the Lane County City Nature Challenge.

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Lane County, Oregon

Join us at the Willamette Confluence as we make observations for the City Nature Challenge with our partner McKenzie River Trust.

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Portland, Oregon

Help TNC Oregon collect observations of species or register for a hike at Camassia Natural Area in West Linn.

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Salem, Oregon

Attend a City Nature Challenge event hosted by our conservation partners in Salem, Oregon.

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Virginia

From bird and salamander walks to watershed cleanups, find an event near you and head outdoors with TNC.

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Washington

Show the world how biodiverse the Seattle-Tacoma metropolitan area is by making as many observations of species as possible.