2021 City Nature Challenge

Mothing & iNaturalist workshops, and City Nature Challenge Observation events require advance registration – see below.

April 30 to May 3

The City Nature Challenge started in 2016 as a friendly competition between naturalists in Los Angeles and San Francisco to see which city could collect the most wild species observations in a short period of time. More than 1000 people participated, collecting over 20,000 observations. The idea grew, and in 2020, 244 cities across the globe participated–collecting 815,258 observations. This year, our goal is for people around the world to work together to top 2020!

You can participate at your own pace with a group of friends or family, or solo! 

We urge all participants to carefully follow state and local Covid safety guidelines. 

Just follow these simple steps:

1. Search and observe

Search your favorite outdoor places for plants, animals, or any other evidence of life, anywhere from your backyard, to a local park or natural area, as long as it is in the greater Portland and Vancouver area.

What are the ​wild plants that are growing in your yard or neighborhood?

Can you find the insects and other creatures that use the cultivated plants in your area as habitat or food?

2. Snap photos

Your phone is great for making observations anywhere! 

3. Share

Share your observations on iNaturalist—a web-based social network for sharing scientifically valuable biodiversity information across the world!


Interested in more?

Are you a naturalist interested in helping us to identify observations after the main event? Please fill in this Google Form to help us get the word out before the event, or to add your expert skills in identifying species between May 4-9.

Email: Citynaturechallengepdx@gmail.com

city nature challenge 2021 events

Mothing & iNaturalist Workshops

photo credit: Celeste Searles Mazzacano

May 1

7:30 PM to 9:15 PM, MAIN ENTRANCE

iNaturalist & CNC Observations

May 2


iNaturalist & CNC Observations at other locations

May 2

12 PM to 2 PM

Tideman Johnson Park

Autumn 2021 Newsletter

Garden Newsletter Autumn 2021

Ikebana in a Box – VIRTUAL

Japanese floral art with Nana Bellerud

$50,000 Challenge Match for September 2021

Help Us Raise $50K for Our Beautiful Garden  For All of Us From now until September 30, 2021, your donation will get matched dollar for dollar, giving us a chance to raise $100,000 for the garden’s operations. Make a Donation Donate early and inspire others! Our...

Fun Activities – August 11



Still Partying Like It’s 1999

Summer 2021 Newsletter

Back 5 update, Staff Transitions, Farm to Table event, Music in the Garden, Updates on Hours, and more!

Fun Activities – May 30

There is plenty to do during this time of physical distancing, from community science projects for all ages, to fun and engaging stories and videos for little children.

Spring 2021 Newsletter

Upper Garden reopens – Main Entrance on SE Claybourne St – Timed-entry ticketing and more!

Introduction to Mushroom Identification

Mushroom identification with Leah BendlinBoth classes are the same. Please choose one.  Please note: a worsening COVID situation may lead to cancelling the class. If that happens, your payment will be refunded in full. Masks required; Proof of Vaccine or a negative...

Fun Activities – August 18

Covid 19 getting to you physically and mentally?

“Nature itself is the best physician.”
– Hippocrates

Subscribe To Our Newsletter

Join our mailing list to receive the latest news and updates from the Garden.

You have Successfully Subscribed!

Skip to content