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City Nature Challenge

The City Nature Challenge is an international effort community effort to find and document plants and wildlife in cities across the globe by using the free iNaturalist app. It’s a bioblitz-style competition where cities are in a friendly contest to see who can make the most observations of nature, find the most species, and engage the most people. To participate, you only need to download the free I-Naturalist app and take wildlife photos! The City Nature Challenge can be done anywhere. If you want more information on using iNaturalist, practice with trained staff at the Gary Halter Nature Center any day from 8am to 5pm during the challenge, and we can show you how fun learning the names of wildlife can be! Join the challenge with us!

The City Nature Challenge provides a yearly snapshot of our wildlife and helps our local researchers learn more about the wildlife that shares our fantastic world with us. If you want to see how our community is doing visit the City Nature Challenge Project! You can see who is participating, look at all the observations, or see which naturalist will be in the lead by visiting https://www.inaturalist.org/projects/city-nature-challenge-2025-brazos-valley-tx.

City Nature Challenge 2025 – Event Schedule

The Observations Phase runs from April 25–28, when participants can take and upload photos to iNaturalist.
The Identification Phase follows from April 29–May 4, where everyone can help identify plants and animals.
Results will be announced on May 5.

Events

  • Friday, April 11: iNaturalist Training from 6:30–8 p.m. at Lick Creek Park.
  • Friday, April 25: BioBlitz from 8 a.m.–12 p.m., location TBD.
  • Friday, April 25: Mothing Party from 8–10 p.m. at Lick Creek Park.
  • Saturday, April 26: Fort Boggy BioBlitz from 8 a.m.–2 p.m. at Fort Boggy State Park.
  • Saturday, April 26: Birding 101 at Brison Park starting at 8:30 a.m.
  • Sunday, April 27: BioBlitz from 8 a.m.–12 p.m., location TBD.
  • Monday, April 28: BioBlitz from 8 a.m.–12 p.m., location TBD.
  • Tuesday, April 29: Identification Party from 1–4 p.m. at Lick Creek Park.
  • Wednesday, April 30: Identification Party from 4–8 p.m. at Lick Creek Park.
  • Monday, May 5: Results Announced online.

All events are free, except for Fort Boggy State Park entry fees.

This challenge covers a six-county area: Brazos, Burleson, Grimes, Leon, Madison, and Robertson.

How to Participate

Yes. Anyone with an iNaturalist account can participate. iNaturalist recommends that young persons be at least 14 years of age to have individual accounts, but participants younger than 14 can participate using a parent’s or teacher’s account.

There are no direct costs to participate. There may be small indirect costs in gas or entrance fees to reach your desired observation site, but you can also participate in your own back yard or a local park for free. There is no cost to participate in the identification phase or any events.

No, you don’t need to register with the Brazos Valley CNC to participate. You do need to register for an iNaturalist account. Any observations that you make during the project period within the project boundaries will automatically be captured by the project.

There will be a free iNaturalist training at Lick Creek Park at 6:30 p.m. on Friday, April 11. There is a free night insect black-lighting party at Lick Creek Park from 8-11 p.m. on Friday, April 25, to collect observations. There will be free identification parties at Lick Creek Park from 1-4 p.m. on Tuesday, April 29, and 4-8 p.m. on Wednesday, April 30. Please bring your own laptop for the identification parties. The Nature Center has public Wifi.

You can also come to the Gary Halter Nature Center from 8 a.m. to 5 p.m. during the City Nature Challenge to learn more and get a quick training from our trained staff!

Anyone who contributes 50 or more observations to the Brazos Valley CNC can receive a free CNC tote bag and patches while supplies last. These can be picked up at Lick Creek Park at any time during the CNC period during the operating hours of the Gary Halter Nature Center. Special commemorative stickers, patches and tote bags will be available throughout the weekend while supplies last.

Observations

The object of the CNC is to document the wild flora and fauna in our urban environment. We are not looking for captive animals (zoo animals, pets) or cultivated plants (garden, house plants).

The line is blurry. Use your best judgement. Some clues: If it is dependent upon humans for food or water, it is not wild. So, animals on display in a zoo, pets in a home, plants in a garden are not wild. If there is a decorative border around the organism, or a watering line, it’s probably not wild. But, you can find wild animals and plants in a park or a zoo. Think insects at the flowers, birds in the trees. Animals attracted to bird feeders or butterfly gardens are not dependent upon the feeders. If you took those feeders or gardens away, those birds or butterflies would survive just as well without them. Animals recently captive that were formerly wild also count. Think fish on a line, whether to be returned to the river or taken home for dinner, or a beetle caught and held briefly for an iNaturalist record.

FAQs

The City Nature Challenge (CNC) is a challenge to document the flora and fauna of urban areas worldwide. It began in 2016 as a friendly citizen science competition between the Los Angeles County Museum of Natural Science and the California Academy of Sciences in San Francisco. It went national in 2017 and international in 2018. It has since grown to over 500 cities on all six populated continents. Brazos Valley joined the Challenge in 2021 in the midst of the covid pandemic.

The City Nature Challenge occurs over the same 10-day period in late April and early May around the world. The City Nature Challenge consists of two stages: observation and identification. The observation period for 2025 is Friday, April 25 to Monday, April 28. The identification period for 2025 is Tuesday, April 29 to Monday, May 4. Both parts are equally important.

The territory for the Brazos Valley City Nature Challenge is the six counties of Brazos, Burleson, Grimes, Leon, Madison, and Robertson. This is the same as the territory served by Texas Master Naturalist Brazos Valley Chapter.

Where can I go to learn more?

Come to the Gary Halter Nature Center anytime during 8am to 5pm, April 25 to April 28, 2025!

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