Photo: Tobias Alt, Tobi 87 · CC BY-SA 4.0 · Wikimedia CommonsRoad RunningWorld Athletics Label
Tcs Toronto Waterfront Marathon
Toronto, Canada
October 16, 2027 to October 17, 2027Date confirmed
42.2 km21.1 km5 km
Culture & HistoryFestive+3
USRunning Territory & Spot
Running Races of Lake Ontario
7 verified events (1 confirmed dates) and 21 races in Lake Ontario with course maps and elevation profiles.
Events71 confirmed dates
Competitions21Races & courses
Distances5 - 42.2 kmCourse distance range
Max. Elevation Gain+549 m D+Course elevation profile
Selected Events
Featured Events & Highlights
Photo: Tobias Alt, Tobi 87 · CC BY-SA 4.0 · Wikimedia Commons
Photo: Dietmar Rabich · CC BY-SA 4.0 · Wikimedia CommonsRoad RunningWalking & HikingWorld Marathon Majors Qualifier
Toronto Marathon
Toronto, Canada
Date to be announcedDate TBA
42.2 km21.1 km10 km5 km
Public ParkLakes & Ponds+4
Photo: Tobias Alt, Tobi 87 · CC BY-SA 4.0 · Wikimedia CommonsRoad RunningWorld Marathon Majors Qualifier
Niagara Falls International Marathon
Niagara Falls, Canada
Date to be announcedDate TBA
42.2 km21.1 km10 km5 km
Public ParkCity Run+4
Photo: Tobias Alt, Tobi 87 · CC BY-SA 4.0 · Wikimedia CommonsRoad RunningWorld Marathon Majors Qualifier
Hamilton Marathon Road2Hope
Hamilton, Canada
Date to be announcedDate TBA
42.2 km21.1 km10 km5 km
Nature & Off-RoadForest+3
Photo: Wickedender · CC BY-SA 3.0 · Wikimedia CommonsTrail Running
Black Diamond Express 5K & Half Marathon Races
Mendon, United States
Date to be announcedDate TBA
21.1 km5 km
Nature & Off-RoadCharity Run+1
Photo: Wilfredor · CC0 1.0 · Wikimedia CommonsRoad Running
Sackets Harbor Marathon
Sackets Harbor, United States
Date to be announcedDate TBA
42.2 km21.1 km
Lakes & PondsNature & Off-Road+1
Photo: Dietmar Rabich · CC BY-SA 4.0 · Wikimedia CommonsRoad Running
Sporting Life 10K
Toronto, Canada
Date to be announcedDate TBA
10 km
Charity RunCity Run
Dates & Schedule
Race Calendar
October 2027
| Date | Event | Location | Disciplines | Distances |
|---|---|---|---|---|
| Oct 16, 2027 - Oct 17, 2027 | Tcs Toronto Waterfront Marathon | Toronto, Ontario, CA | Road Running | 42.2 km21.1 km5 km |
Date to be announced
| Date | Event | Location | Disciplines | Distances |
|---|---|---|---|---|
| Date to be announced | Toronto Marathon | Toronto, Ontario, CA | Road RunningWalking & Hiking | 42.2 km21.1 km10 km5 km |
| Date to be announced | Niagara Falls International Marathon | Niagara Falls, Ontario, CA | Road Running | 42.2 km21.1 km10 km5 km |
| Date to be announced | Hamilton Marathon Road2Hope | Hamilton, Ontario, CA | Road Running | 42.2 km21.1 km10 km5 km |
| Date to be announced | Black Diamond Express 5K & Half Marathon Races | Mendon, New York, US | Trail Running | 21.1 km5 km |
| Date to be announced | Sackets Harbor Marathon | Sackets Harbor, New York, US | Road Running | 42.2 km21.1 km |
| Date to be announced | Sporting Life 10K | Toronto, Ontario, CA | Road Running | 10 km |
Events by Month
Overview & Route Character
The running territory of Lake Ontario (United States, New York) is represented in the RunningCompass catalog with 7 public events and 21 individual races, including 1 events with confirmed dates for the 2026-2027 season. Core disciplines include Road Running, Walking & Hiking, and Trail Running. Key host locations include Toronto, Niagara Falls, Hamilton, and Mendon. Notable events in the selection include Tcs Toronto Waterfront Marathon, Toronto Marathon, and Niagara Falls International Marathon.
Race distances span from 5 km to 42.2 km, reaching up to +549 m of elevation gain on the most demanding courses. Every race listed for Lake Ontario includes an interactive MapLibre course map powered by OpenStreetMap, a high-resolution SVG elevation profile with gradient telemetry, and a direct GPX track download.
Questions & Answers
Frequently asked questions (FAQ)
How many running events and races take place in Lake Ontario?
RunningCompass currently lists 7 verified events with 21 individual races in Lake Ontario. A total of 1 events have confirmed upcoming dates, while additional annual editions include full course and distance specifications. Notable events in the selection include Tcs Toronto Waterfront Marathon, Toronto Marathon, and Niagara Falls International Marathon.
What disciplines and race distances are offered in Lake Ontario?
Events in Lake Ontario focus on Road Running, Walking & Hiking, and Trail Running. Course distances range from 5 km entry-level races up to 42.2 km endurance challenges. Primary host cities and towns include Toronto, Niagara Falls, Hamilton, and Mendon.
What is the course profile, terrain, and elevation gain like in Lake Ontario?
The most selective courses in Lake Ontario climb up to +549 m of positive elevation gain. Each event page provides exact altitude range, ascent (+m), descent (-m), average and maximum gradient, an interactive course map, and a downloadable GPX file.
How can I find dates and register for running events in Lake Ontario?
The monthly race calendar on this page groups all confirmed dates chronologically alongside annual events awaiting their next date announcement. Use the discipline, distance, and month links or switch to the interactive map view (/en/events?view=map) to inspect individual event profiles and official organizer registration links.