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Upcoming Events

 
Field Trips and Events
Mudhen 5k Trailrun at Big Marsh!
Mar 14
Big Marsh Park
Mudhen 5k Trailrun at Big Marsh!
Big Marsh Park

Join Chicago Park District, Friends of Big Marsh, and Chicago Ornithological Society for the return of the Mudhen 5k fun run at Big Marsh Park on Saturday, March 14!

Big Marsh Park
LaBagh Woods Stewardship Workday
Mar 15
LaBagh Woods Grove #1
LaBagh Woods Stewardship Workday
LaBagh Woods Grove #1

Join us for a habitat restoration workday at COS’s flagship stewardship site LaBagh Woods, and help bring back critical bird habitat.

LaBagh Woods Grove #1
Humboldt Park Sunday Social Bird Walk
Mar 15
Humboldt Park
Humboldt Park Sunday Social Bird Walk
Humboldt Park

RSVP Required

Join us as we explore Humboldt Park in search of early spring birds in this incredible oasis in the surrounding urban environment.

Humboldt Park
COS in the Suburbs: Crabtree Nature Center
Mar 16
Crabtree Nature Center
COS in the Suburbs: Crabtree Nature Center
Crabtree Nature Center

RSVP Required

Experience birding in March in the northwest suburbs. A diversity of birds can be found throughout the prairie, woodland, and wetland habitats.

Crabtree Nature Center
North Pond Wednesday Bird Walks
Mar 18
North Pond Casting Pier
North Pond Wednesday Bird Walks
North Pond Casting Pier

In cooperation with Third Coast Birding and Peggy Notebaert Nature Museum, COS is proud to continue our long tradition of Wednesday morning bird walks at North Pond!

North Pond Casting Pier
LaBagh Woods Beginner Bird Walk
Mar 20
Labagh Woods
LaBagh Woods Beginner Bird Walk
Labagh Woods

RSVP Required

Join us on a hike through the woods to observe early spring migrants as well as the wood's year-round residents. All ages and experience levels are welcome!

Labagh Woods
Woodcock Walk - Air Station Prairie
Mar 24
Kent Fuller Air Station Prairie
Woodcock Walk - Air Station Prairie
Kent Fuller Air Station Prairie

RSVP Required

Join COS on an evening hike to observe the spectacular making dance of the elusive Timber doodle (or American Woodcock).

Kent Fuller Air Station Prairie
North Pond Wednesday Bird Walks
Mar 25
North Pond Casting Pier
North Pond Wednesday Bird Walks
North Pond Casting Pier

In cooperation with Third Coast Birding and Peggy Notebaert Nature Museum, COS is proud to continue our long tradition of Wednesday morning bird walks at North Pond!

North Pond Casting Pier
Woodcock Walk - Air Station Prairie
Mar 26
Kent Fuller Air Station Prairie
Woodcock Walk - Air Station Prairie
Kent Fuller Air Station Prairie

RSVP Required

Join COS on an evening hike to observe the spectacular making dance of the elusive Timber doodle (or American Woodcock).

Kent Fuller Air Station Prairie
Woodcock Walk at Indian Boundary Prairies
Mar 26
Woodcock Walk at Indian Boundary Prairies

Join COS on an evening hike to observe the spectacular making dance of the elusive Timber doodle (or American Woodcock).

Woodcock Walk at Marian Byrnes Natural Area
Mar 28
Marian Byrens Natural Area
Woodcock Walk at Marian Byrnes Natural Area
Marian Byrens Natural Area

Join COS on an evening hike to observe the spectacular making dance of the elusive Timber doodle (or American Woodcock).

Marian Byrens Natural Area
Woodcock Walk at Indian Boundary Prairies
Mar 30
Woodcock Walk at Indian Boundary Prairies

Join COS on an evening hike to observe the spectacular making dance of the elusive Timber doodle (or American Woodcock).

The Chicago Birder Blog

 
Blog
Field Trip Recap: Humboldt Park Sunday Social
Field Trip Recap: Humboldt Park Sunday Social

COS member Carrie Larkin recaps the Feb. 15 Sunday Social at Humboldt Park.

Field Trip Recap: Starved Rock Scramble
Field Trip Recap: Starved Rock Scramble

Trip leader Vinod Babu recaps the February 7 birding caravan across LaSalle County.

2025 Big Marsh Bird Banding Recap
2025 Big Marsh Bird Banding Recap

Lindsay Welbers recaps the 2025 season at the Big Marsh bird banding station.

Field Trip Recap: Waterfowl Watch
Field Trip Recap: Waterfowl Watch

COS member Steve Whitman recaps the Waterfowl Walk, activity zone and presentation at Northerly Island on Jan. 10, 2026.

Field Trip Recap: Cranberry Slough
Field Trip Recap: Cranberry Slough

COS member Joann Umeki recaps the bird walk at Cranberry Slough on Jan. 4, 2026.

Field Trip Recap: Owl Prowls
Field Trip Recap: Owl Prowls

COS member Lauren Kostas recaps the Owl Prowls at North Park Village Nature Center in November and December.