Jun
20
to Sep 27
View Event →
Aug
23
7:00 AM07:00
Horner Park
RSVP Required
Join us as we explore Horner Park - a city park with a natural area that stretches along the Chicago River. We'll look for early fall migratory birds and soak in the blooming wildflowers.
Aug
23
9:00 AM09:00
LaBagh Woods Stewardship Workday
Join us for a habitat restoration workday at COS’s flagship stewardship site LaBagh Woods, and help bring back critical bird habitat.
Aug
24
to Aug 30
Nighthawk Watch at Horner Park
RSVP Required
Join COS for a nocturnal twist on the classic hawk watch, our third annual Nighthawk Watch!
Aug
27
7:00 AM07:00
North Pond Wednesday Bird Walks
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!
Aug
31
10:00 AM10:00
Humboldt Park Sunday Social Bird Walk
RSVP Required
Join us as we explore Humboldt Park as migratory birds flock to this incredible green oasis in the surrounding urban environment.
Aug
31
to Sep 6
Nighthawk Watch at Northerly Island
RSVP Required
Join COS for a nocturnal twist on the classic hawk watch, our third annual Nighthawk Watch!
Sep
3
7:00 AM07:00
North Pond Wednesday Bird Walks
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!
Sep
6
9:00 AM09:00
Montrose Bird Sanctuary Stewardship Workday
Join the stewards of Montrose Point Bird Sanctuary (Magic Hedge) for a workday at one of the top bird watching spots in the country!
Sep
7
6:00 AM06:00
Sunrise Birding at Montrose Point
RSVP Required
Join COS for an early morning bird outing at Montrose Point Bird Sanctuary.
Sep
7
10:00 AM10:00
Beginner Birding at Jarvis Bird Sanctuary
RSVP Required
Join COS for a beginner bird walk at Bill Jarvis Migratory Bird Sanctuary.
Sep
7
5:30 PM17:30
Sunset Birding at McKinley Park
RSVP Required
End the daylight hours with a COS bird walk at McKinley Park.
Sep
8
7:00 AM07:00
COS in the Suburbs: Carl R. Hansen Woods
RSVP Required
Explore the prairie, woodland, and wetland habitats of this northwest suburban forest preserve during fall migration.
Sep
10
7:00 AM07:00
North Pond Wednesday Bird Walks
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!
Sep
12
to Sep 14
The Urban Birding Festival
Chicago Ornithological Society is proud to present, in association with our many birding partners, The Urban Birding Festival! Taking place in and around Chicago on September 12-14, 2025 this festival highlights the extraordinary bird diversity present in the area with over 400 recorded species in the Chicago region.
Sep
14
9:00 AM09:00
LaBagh Woods Stewardship Workday
Join us for a habitat restoration workday at COS’s flagship stewardship site LaBagh Woods, and help bring back critical bird habitat.
Sep
20
9:00 AM09:00
Montrose Dunes Stewardship Workday
Join the stewards of Montrose Beach Dunes for a workday at one of the top bird watching spots in the country!
Sep
20
9:30 AM09:30
Big Marsh Stewardship Workday
Join park staff for a workday at one of the top bird watching spots in the country; Big Marsh Park!
Sep
27
9:00 AM09:00
LaBagh Woods Stewardship Workday
Join us for a habitat restoration workday at COS’s flagship stewardship site LaBagh Woods, and help bring back critical bird habitat.
Oct
5
9:00 AM09:00
LaBagh Woods Stewardship Workday
Join us for a habitat restoration workday at COS’s flagship stewardship site LaBagh Woods, and help bring back critical bird habitat.
Oct
18
9:00 AM09:00
Montrose Point AND Dunes Stewardship Workday
Join the stewards of Montrose Point Bird Sanctuary for a workday at one of the top bird watching spots in the country!
Oct
18
9:30 AM09:30
Big Marsh Stewardship Workday
Join park staff for a workday at one of the top bird watching spots in the country; Big Marsh Park!
Oct
25
9:00 AM09:00
LaBagh Woods Stewardship Workday
Join us for a habitat restoration workday at COS’s flagship stewardship site LaBagh Woods, and help bring back critical bird habitat.
Nov
9
10:00 AM10:00
LaBagh Woods Stewardship Workday
Join us for a habitat restoration workday at COS’s flagship stewardship site LaBagh Woods, and help bring back critical bird habitat.
Nov
22
10:00 AM10:00
LaBagh Woods Stewardship Workday
Join us for a habitat restoration workday at COS’s flagship stewardship site LaBagh Woods, and help bring back critical bird habitat.
Aug
20
7:00 AM07:00
North Pond Wednesday Bird Walks
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!
Aug
17
10:00 AM10:00
Humboldt Park Sunday Social Bird Walk
RSVP Required
Join us as we explore Humboldt Park as migratory birds flock to this incredible green oasis in the surrounding urban environment.
Aug
16
9:30 AM09:30
Big Marsh Stewardship Workday
Join park staff for a workday at one of the top bird watching spots in the country; Big Marsh Park!
Aug
16
9:00 AM09:00
Montrose Dunes Stewardship Workday
Join the stewards of Montrose Beach Dunes for a workday at one of the top bird watching spots in the country!
Aug
16
8:30 AM08:30
Borbs and Forbs: Columbus Park
RSVP Required
Borbs and Forbs is a monthly event for nature enthusiasts and those inspired to give back to our communities. Each month we will visit a Chicago Park to admire local birds and other fauna, followed by a stewardship day with the park's steward.
Aug
13
7:00 AM07:00
North Pond Wednesday Bird Walks
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!
Aug
3
9:00 AM09:00
LaBagh Woods Stewardship Workday
Join us for a habitat restoration workday at COS’s flagship stewardship site LaBagh Woods, and help bring back critical bird habitat.
Aug
3
9:00 AM09:00
Montrose Bird Sanctuary Stewardship Workday
Join the stewards of Montrose Point Bird Sanctuary (Magic Hedge) for a workday at one of the top bird watching spots in the country!
Jul
29
5:30 PM17:30
Flock Club Book Club: Turning to Birds
Join COS for Flock Club Book Club to discuss Lily Taylor’s Turning to Birds. In the spirit of our yearlong celebration of green birding, we’ll discuss this book’s mindfulness approach to birding.
Jul
26
9:00 AM09:00
Montrose Dunes Stewardship Workday
Join the stewards of Montrose Beach Dunes for a workday at one of the top bird watching spots in the country!
Jul
20
9:00 AM09:00
LaBagh Woods Stewardship Workday
Join us for a habitat restoration workday at COS’s flagship stewardship site LaBagh Woods, and help bring back critical bird habitat.
Jul
19
7:45 AM07:45
Borbs and Forbs: Dunning-Read Natural Area
RSVP Required
Borbs and Forbs is a monthly event for nature enthusiasts and those inspired to give back to our communities. Each month we will visit a Chicago Park to admire local birds and other fauna, followed by a stewardship day with the park's steward.
Jul
12
9:00 AM09:00
Montrose Bird Sanctuary Stewardship Workday
Join the stewards of Montrose Point Bird Sanctuary (Magic Hedge) for a workday at one of the top bird watching spots in the country!
Jul
12
9:00 AM09:00
LaBagh Woods Stewardship Workday
Join us for a habitat restoration workday at COS’s flagship stewardship site LaBagh Woods, and help bring back critical bird habitat.
Jul
11
4:30 PM16:30
Grassland Birds at Horizon Farms
RSVP Required
Join COS in search of breeding grassland birds at Horizon Farm.
Jul
5
7:30 AM07:30
Orland Grassland Bird Walk
RSVP Required
Join us as we look for these specialty grassland birds as well as woodpeckers, flycatchers, and other summering birds at this restored farmland site.
Jun
29
3:00 PM15:00
Bird Walk at Humboldt Park for Families and Beginners
RSVP Required
Join us as we explore Humboldt Park on a bird walk tailored for new birders and families.
Jun
28
8:45 AM08:45
Borbs and Forbs: Garfield Park
RSVP Required
Borbs and Forbs is a monthly event for nature enthusiasts and those inspired to give back to our communities. Each month we will visit a Chicago Park to admire local birds and other fauna, followed by a stewardship day with the park's steward.
Jun
27
6:30 PM18:30
Bird Walk at Douglass Park for Families and Beginners
RSVP Required
Attention families and beginners: end the daylight hours with a COS bird walk at Douglass Park.
Jun
26
6:00 PM18:00
Flock Club: The River Kitchen and Bar
COS proudly presents Flock Club - a social event by and for birders. Join us as we gather to share our passion for birds in a casual and accessible environment.
Jun
25
7:00 PM19:00
Sunset Bird Walk at Douglass Park
RSVP Required
End the daylight hours with a COS bird walk at Douglass Park.
Jun
22
9:00 AM09:00
LaBagh Woods Stewardship Workday
Join us for a habitat restoration workday at COS’s flagship stewardship site LaBagh Woods, and help bring back critical bird habitat.
Jun
21
9:00 AM09:00
Montrose Dunes Stewardship Workday
Join the stewards of Montrose Beach Dunes for a workday at one of the top bird watching spots in the country!
Jun
18
7:00 AM07:00
North Pond Wednesday Bird Walks
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!
Jun
17
6:00 PM18:00
After Work Walk at Park 566
RSVP Required
Decompress after work with COS at Park 566 as we look for grassland birds along the lakefront.
Jun
16
9:00 AM09:00
Lincoln Park Zoo Bird Walk for Families and Beginners
RSVP Required
Join COS for a bird outing at Lincoln Park Zoo specifically tailored for new birders and familes.
Jun
14
4:30 PM16:30
Grassland Birds at Horizon Farms
RSVP Required
Join COS in search of breeding grassland birds at Horizon Farm.
Jun
12
6:30 PM18:30
Beginning Birding on the Wild Mile
Join COS and Urban Rivers for a workshop on the Chicago River to learn how to find and identify Chicago’s many feathered friends. We will walk participants through the basics of bird identification and what a hopeful birder needs to get started looking for birds.
Jun
11
7:00 AM07:00
North Pond Wednesday Bird Walks
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!
Jun
8
9:00 AM09:00