Jan
31
8:00 AM08:00
Filtering by: Field Trip
View Event →
Feb
7
9:00 AM09:00
Starved Rock Scramble
RSVP Required
On this trip, we'll explore the magical winter landscape of the canyons along the Illinois River at Starved Rock- Ottawa, Kaskasia and Illinois.
Feb
8
8:00 AM08:00
COS in the Suburbs: Crabtree Nature Center
RSVP Required
Experience birding in February in the northwest suburbs. A diversity of birds can be found throughout the prairie, woodland, and wetland habitats.
Feb
8
9:00 AM09:00
Calumet River Basin Blitz
RSVP Required
Join us as we conduct a blitz of some of the best spots on the Calumet River to observe winter waterfowl.
Feb
15
9:00 AM09:00
Chicago River Basin Blitz
RSVP Required
Join us as we conduct a blitz of some of the best spots on the Chicago River to observe winter waterfowl.
Feb
15
10:00 AM10:00
Humboldt Park Sunday Social Bird Walk
RSVP Required
Join us as we explore Humboldt Park in search of winter birds in this incredible oasis in the surrounding urban environment.
Feb
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!
Mar
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!
Mar
25
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!
Apr
1
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!
Apr
8
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!
Apr
15
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!
Apr
22
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!
Apr
24
to Apr 27
City Nature Challenge 2026
COS is excited to once again be a co-organizer of the Chicago area team in this year’s City Nature Challenge!
Apr
29
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
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
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
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
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!
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
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
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!
Jan
25
10:00 AM10:00
Humboldt Park Sunday Social Bird Walk
RSVP Required
Join us as we explore Humboldt Park in search of winter birds in this incredible oasis in the surrounding urban environment.
Jan
25
8:00 AM08:00
COS in the Suburbs: Crabtree Nature Cente
RSVP Required
Experience birding in January in the northwest suburbs. A diversity of birds can be found throughout the prairie, woodland, and wetland habitats.
Jan
14
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!
Jan
10
9:00 AM09:00
Winter Waterfowl Watch at Northerly Island
Chicago Ornithological Society and the Chicago Park District are excited to join forces and host the first ever Winter Waterfowl Watch!
Jan
6
5:30 PM17:30
Family & Adult Owl Prowls at North Park Village
In partnership with the Chicago Park District, come and learn about the raptor of the night- the owl! This interpretive program and guided walk will lead participants through the preserve in search of owls.
Jan
4
8:00 AM08:00
Sloughs of the Palos Area: Cranberry Slough
RSVP Required
Join COS for a hike through Cranberry Slough in search of an array of woodpeckers and other winter residents.
Dec
25
7:00 AM07:00
72nd Lakefront Christmas Bird Count
RSVP Required
Join COS for the annual Lakefront Christmas Bird Count! Every year on Christmas day, birders sally forth to count birds and contribute their sightings to the oldest continuously running citizen science project in the world.
Dec
20
7:00 AM07:00
1st Chicago South Christmas Bird Count
RSVP Required
Join COS for the annual Chicago South Christmas Bird Count! Every year on Christmas day, birders sally forth to count birds and contribute their sightings to the oldest continuously running citizen science project in the world.
Dec
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!
Dec
16
5:30 PM17:30
Family & Adult Owl Prowls at North Park Village
In partnership with the Chicago Park District, come and learn about the raptor of the night- the owl! This interpretive program and guided walk will lead participants through the preserve in search of owls.
Dec
14
7:00 AM07:00
77th Lisle Christmas Bird Count and Dinner
RSVP Required
Join COS for the 76th Annual Lisle Christmas Bird Count and Dinner! Every year on a wintery Sunday in December, birders sally forth to count birds and contribute their sightings to the oldest continuously running citizen science project in the world.
Dec
11
6:00 PM18:00
Marian R. Byrnes Natural Area Owl Prowl
RSVP Required
Join COS for an owl prowl at Marian R. Byrnes Natural Area.
Dec
7
10:00 AM10:00
Humboldt Park Sunday Social Bird Walk
RSVP Required
Join us as we explore Humboldt Park in search of winter birds in this incredible oasis in the surrounding urban environment.
Nov
27
9:00 AM09:00
Humboldt Park Birdsgiving Stroll
RSVP Required
Join us as we explore Humboldt Park in search of birds on Thanksgiving morning.
Nov
24
9:00 AM09:00
COS in the Suburbs: Crabtree Nature Center
RSVP Required
Experience birding in November in the northwest suburbs. A diversity of birds can be found throughout the prairie, woodland, and wetland habitats.
Nov
22
6:00 AM06:00
Park 566 Owl Prowl
Join COS for an owl prowl at Park 566. We will look for owls of all kinds but will focus on finding Short-eared Owls that are seen there frequently!
Nov
19
6:00 PM18:00
Nov
18
5:30 PM17:30
Family & Adult Owl Prowls at North Park Village
In partnership with the Chicago Park District, come and learn about the raptor of the night- the owl! This interpretive program and guided walk will lead participants through the preserve in search of owls.
Nov
12
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!
Nov
8
9:00 AM09:00
Hawkwatch at Northerly Island
Join COS for a morning observing hawks migrating down the lake front. This is a mostly stationary birding experience.
Nov
8
6:00 AM06:00
Park 566 Owl Prowl
Join COS for an owl prowl at Park 566. We will look for owls of all kinds but will focus on finding Short-eared Owls that are seen there frequently!
Nov
5
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!
Nov
2
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.
Oct
29
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!
Oct
26
7:30 AM07:30
West Ridge Nature Park Walk
RSVP Required
Join us as we search for any remaining fall migrants at a hidden gem in the city full of native flora, a large pond, and plenty of lookout points.
Oct
25
8:00 AM08:00
Cuba Marsh Forest Preserve Bird Walk
RSVP Required
Join COS and Lake County Audubon Society for a hike at Cuba Marsh.
Oct
24
8:00 AM08:00
Montrose Point Bird Sanctuary
RSVP Required
Join us at Montrose for a morning of fall migration birding.
Oct
24
8:00 AM08:00
Hawkwatch the Wall at Steelworkers Park
RSVP Required
Join COS for a morning observing hawks migrating down the lake front from a unique vantage point - the top of the climbing wall.
Oct
22
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!
Oct
20
8:00 AM08:00