May
27
7:00 AM07:00
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May
27
5:00 PM17:00
COS in the Suburbs: Bird Walk at Buffalo Creek
RSVP Required
Join COS for an evening bird walk at Buffalo Creek to enjoy migratory spring birds.
May
27
6:00 PM18:00
After Work Bird Walk at The Wild Mile
RSVP Required
Join COS for an afternoon walk as we decompress from a long day at work and look for birds at the Wild Mile.
May
30
7:30 AM07:30
LaBagh Woods Spring Bird Walk
RSVP Required
Join us on a hike through the woods to observe spring migrants as well as the wood's year-round residents.
May
31
8:00 AM08:00
Jackson Park Bird Walk
RSVP Required
Join COS for a Sunday morning bird walk at Jackson Park to look for migratory spring birds!
May
31
8:00 AM08:00
Marian Byrnes - Birds & Botany
RSVP Required
With over 100 acres of wetlands, prairie, and savannah to explore, we'll be on the look out for a variety of early migrants including rails, warblers, sparrows, and raptors.
Jun
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!
Jun
6
8:00 AM08:00
Beginner Birding at Horner Park
RSVP Required
A great place for beginner birders, Horner Park is a city park with a natural area that stretches along the Chicago River.
Jun
7
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!
Jun
9
4:30 PM16:30
COS in the Suburbs: Horizon Farm
RSVP Required
Join COS in search of breeding grassland birds at Horizon Farm.
Jun
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!
Jun
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.
Jun
17
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
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!
Jun
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.
Jul
11
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
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
16
6:00 PM18:00
Birds & Bytes: Conserving Common Nighthawks in NH
RSVP Required
Join us for a program about the mysterious nighthawk and the work being done in New Hampshire to help conserve them.
Jul
18
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
19
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
2
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!
Aug
22
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
24
to Aug 30
Nighthawk Watch at Horner Park
RSVP Required
Join COS for a nocturnal twist on the classic hawk watch, our fourth annual Nighthawk Watch!
Sep
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!
Sep
18
to Sep 20
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 18-20, 2026 this festival highlights the extraordinary bird diversity present in the area with over 400 recorded species in the Chicago region.
Sep
19
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!
Oct
3
10:00 AM10:00
Nightjars of the World
In Person Program
RSVP Required
It’s the Year of the Nighthawk! Join COS at the Field Museum for a behind-the-scenes journey through the Field Museum's Bird Collection highlighting nightjar specimens!
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!
May
26
2:30 PM14:30
Afternoon Bird Walk at Thatcher Woods Forest Preserve
RSVP Required
Join COS for a thrilling visit to Thatcher Woods! It’s a unique site where we can expect to see a lot of woodland and migratory bird species.
Únanse con la SOC para un paseo de aves después de las horas del trabajo. El Bosque de Thatcher es un sitio único donde podemos esperar ver muchas especies de bosques y aves migratorias.
May
26
10:30 AM10:30
Lincoln Park Zoo Bird Walk
RSVP Required
Join COS for an late morning bird outing at Lincoln Park Zoo. The park’s Nature Boardwalk is an excellent example of restoring native habitats in urban environments.
May
26
5:30 AM05:30
Sunrise Bird Walk at Montrose Point
RSVP Required
Join us at Montrose for spring migration birding at sunrise.
May
24
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.
May
23
6:00 PM18:00
Sunset Bird Walk at Horizon Farm
RSVP Required
Join COS in search of breeding grassland birds at Horizon Farm.
May
23
5:30 PM17:30
Black Feather: A Goth Bird Walk in Humboldt Park
RSVP Required
Join COS in Humboldt Park for a celebration of World Goth Day, black birds and dark (but positive) vibes!
May
23
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!
May
21
6:00 PM18:00
Sunset Bird Walk at Douglass Park
RSVP Required
End the daylight hours with a COS bird walk at Douglass Park. This 160-acre hotspot that packs diverse habitats including prairie, savanna, and wetland.
May
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!
May
18
4:30 PM16:30
COS in the Suburbs: Beginner Birders at Spring Valley
RSVP Required
Join COS for an afternoon bird walk at Spring Valley to enjoy migratory birds.
May
18
8:00 AM08:00
COS in the Suburbs: Crabtree Nature Center
RSVP Required
Experience birding in May in the northwest suburbs. A diversity of birds can be found throughout the prairie, woodland, and wetland habitats.
May
15
6:30 AM06:30
Early Bird Horner Park Walk
RSVP Required
Start your weekend early with a "pre-work" walk where we will look for spring migrants like warblers, vireos, thrushes, and orioles.
May
13
4:30 PM16:30
COS in the Suburbs: Bird Walk at Penny Road Pond
RSVP Required
Join COS for a late afternoon bird walk at Spring Lake Forest Preserve to enjoy migratory birds.
May
13
8:00 AM08:00
Daniel Wright Woods (Lake Co.)
RSVP Required
Let us explore Daniel Wright Woods in Lake County. This is a big-tree preserve along the Des Plaines Reserve near Vernon Hills that features a very interesting mix of spring migrants
May
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!
May
12
6:30 PM18:30
Birds & Bytes: Shining a Light on Nighthawk Conservation
RSVP Required
Join us for a program about the mysterious nighthawk and the work being done in Canada to help conserve them.
May
11
5:00 PM17:00
Birds Show Us the Way: an evening with BirdLife International CEO Martin Harper
RSVP Required
Join us for a very special guest program with Martin Harper, CEO of BirdLife International as we talk about Chicago’s place in the global mosaic of bird conservation!
May
10
7:30 AM07:30
Linne Woods Bird Walk
RSVP Required
Migration season is on us. Let us walk along the bottomland and upland sections of Linne Woods and look for all manner of woodland migrants- sparrows, vireos and warblers galore!
May
9
1:00 AM01:00
IL Spring Bird Count
Join the annual Illinois Spring Bird Count and help support one of the longest running citizen science efforts in the state.
May
8
7:30 AM07:30
Montrose Point Bird Sanctuary
RSVP Required
Join us at Montrose for a morning of spring migration birding.
May
8
6:30 AM06:30
Early Bird Horner Park Walk
RSVP Required
Start your weekend early with a "pre-work" walk where we will look for spring migrants like warblers, vireos, thrushes, and orioles.
May
7
8:00 AM08:00
Daniel Wright Woods (Lake Co.)
RSVP Required
Let us explore Daniel Wright Woods in Lake County. This is a big-tree preserve along the Des Plaines Reserve near Vernon Hills that features a very interesting mix of spring migrants
May
6
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!
May
3
10:00 AM10:00
Humboldt Park Sunday Social Bird Walk
RSVP Required
Join us as we explore Humboldt Park in search of spring birds in this incredible oasis in the surrounding urban environment.
May
2
9:00 AM09:00
Marquette Park Stewardship Workday
Join a stewardship workday at one of the remnant habitats left in the city!
May
2
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!
May
2
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.
May
2
7:30 AM07:30
Linne Woods Bird Walk
RSVP Required
Migration season is on us. Let us walk along the bottomland and upland sections of Linne Woods and look for all manner of woodland migrants- sparrows, vireos and warblers galore!
May
1
7:30 AM07:30
Montrose Point Bird Sanctuary
RSVP Required
Join us at Montrose for a morning of spring migration birding.
Apr
29
7:00 AM07:00