It's time for the City Nature Challenge
Join us for the City Nature Challenge: A four-day global event to observe and document wildlife in our cities!
April 24 – April 27, 2026
The Lehigh Valley and its surrounding counties harbor an impressive diversity of wildlife, from migrating warblers and native wildflowers to fascinating fungi and aquatic species along our creeks and rivers.
Here's how to participate:
- Get the iNaturalist app and make an account. You can join the Lehigh Valley project on iNaturalist too.
- Go out – Explore on your own or join one of our scheduled photo walks. You can even make observations in your own backyard!
- Find any wild thing – Plants, mammals, birds, insects, fungi, or even evidence of living organisms like tracks, scat, or nests.
- Take a picture – Use your camera or the free iNaturalist app on your phone to snap photos and upload your observations.
- Learn more – Watch as your observations get identified by the iNaturalist community and contribute to our understanding of local biodiversity.
All observations made in the Lehigh Valley area during the challenge dates will automatically count toward our city's total. You don't need to be an expert – all ages and experience levels are welcome!
Join a Bioblitz this weekend
You can take pictures and make observations by yourself anywhere, but it's a lot of fun to go out with a group! We've scheduled two photo walks, and the Lehigh U Bioblitz Club is running four more. Sign up and come explore with us!
Friday, April 24th in Allentown
Jordan Creek Bioblitz
Signup link »
A two-part event starting at Dan’s Camera City and then exploring the Jordan Creek Park
- 2:00 – 3:30pm at Dan’s Camera City
- 4:00 – 6:00 meeting at 1401 Lehnert Rd, Whitehall Twp.
Monday, April 27 in Easton
Arts Walk Bioblitz
Signup link »
A guided photo walk & bioblitz at the Karl Stirner Arts Trail
When: 4:00 – 6:00pm
1235 Simon Boulevard, Easton, PA
Meeting location: Park in the Karl Stirner Arts Trail parking lot at the Silk Mill. We’ll meet up at the Black Steel Root sculpture, then cross the pedestrian bridge to the Arts Trail.
The Lehigh Bioblitz Club is running four events during the City Nature Challenge. Come out and help contribute to a community science initiative aimed at documenting local biodiversity!
Contact auc426@lehigh.edu or rak326@lehigh.edu with any questions
Friday, April 24th:
South Mountain Creek Night Bioblitz
WHEN: 9:00 PM to 10:30 PM
MEETING LOCATION: Flagpole in front of UC (29 Trembley Drive)
Saturday, April 25th:
South Mountain BioBlitz
WHEN: 10:00 AM to 12:00 PM
WHERE: Meet in STEPS building, Room 102 (1 W Packer Ave)
D&L BioBlitz and Trash Pickup
WHEN: 2:00 PM to 4:00 PM
MEETING: Farrington Square (1 Farrington Square, Bethlehem PA)
Sunday, April 26th
Saucon Creek Aquatic Critter Wading Adventure
Registration Link »
WHEN: 3:30 PM to 5:30 PM
WHERE: Meet at STEPS (1 W Packer Ave), drive to Saucon Creek
Come out and have some fun exploring nature this weekend! No science background needed, just bring your curiosity and your smartphone. All ages and skill levels are welcome. Get outside, snap some photos, and help put the Lehigh Valley on the map for biodiversity.
