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St. Lawrence Marathon

Cornwall, ON
Saturday, April 25, 2026


  4 Stars from 2 Reviews

Course Description
The net downhill, point-to-point St. Lawrence Marathon course starts at the Crysler Marina, just west of Upper Canada Village near Morrisburg. The course follows the bike path to the Long Sault Parkway entrance at Ingleside. It then continues along the parkway to Long Sault where it re-joins the bike path and travels along the waterfront to the finish at the Cornwall campus of St. Lawrence College.

Although the course is a net downhill, there are a few short steep sections along the second half. In addition, the first 8 kilometers are on a firm trail with the rest of the course on asphalt paths.

April Other Marathons in April Other Marathons in Ontario Marathons near Cornwall, ON



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Race Information

Race Dates

2027: TBD
2026: Saturday, April 25, 2026

Course Information

Profile: Mostly Flat
Type: Point to Point
Surface: Mostly on Road/Pavement

Boston Qualifier?: Yes
World Marathon Major Qualifier?: No

Race Day Weather

Mean Temp.: 50°F (10°C)
Average High: 61°F (16°C)
Average Low: 38° F (3°C)




PR Score & Course Score

PR Score: 99.28
Course Score: 99.28

Race Size

2026: 142 Finishers
2025: 274 Finishers
2024: 215 Finishers
2023: 176 Finishers
2022: 137 Finishers
2021: No Results

BQ Percentages

2026: 12.7%
2025: 15%
2024: 21.9%
2023: 26.1%
2022: 23.4%
2021: N/A

Miscellaneous Information

Pace Groups?: No

Weather Averages for Last 5 Years


Race Day Temperatures

High: 58°F  (14°C)
Low: 38°F  (3°C)

Race Start Conditions

44°F  (7°C)
Humidity: 67%

Clear
ENE 5 mph

PR Score

99.28

Course Score

99.28






St. Lawrence Marathon Rankings, Course Speed & Boston Qualifier Statistics

The St. Lawrence Marathon was the 19th largest marathon in Canada in 2025 based on the number of finishers. In 2024, it ranked as the 23rd largest marathon in Canada.

In 2026, 12.7% of St. Lawrence Marathon finishers have achieved Boston Marathon qualifying times. In 2025, 15% of finishers qualified for the Boston Marathon.

Based on its percentage of Boston Qualifiers (BQs), the St. Lawrence Marathon ranked 7th among marathons in Canada in 2025 and currently ranks 4th so far in 2026. In Ontario, it ranked 5th in 2025 and 3rd so far in 2026. These rankings provide a useful benchmark for comparing the St. Lawrence Marathon with other Boston Marathon qualifying races.

The St. Lawrence Marathon has a Course Score of 99.28, ranking it as the 12th fastest marathon course in Canada and the 8th fastest marathon course in Ontario.

Typical race-time temperature and humidity levels are within the ideal range for optimal marathon performance. Combined with the course profile, this gives the St. Lawrence Marathon a PR Score of 99.28. The PR Score ranks the St. Lawrence Marathon as the 12th best marathon in Canada for running a Personal Record (PR) and the 8th best marathon for a PR in Ontario.

Together, these rankings provide a quick snapshot of how the St. Lawrence Marathon compares with other marathons in Canada and Ontario for speed, PR potential, Boston Marathon qualifying success, and overall participation.

St. Lawrence Marathon Marathon Rankings Summary
Course Speed12th fastest marathon course in Canada
Ranked 8th fastest marathon course in Ontario
Top 38% Nationally#8 of 12 in Ontario
PR Potential12th best marathon for a Personal Record in Canada
Ranked 8th best marathon for a PR in Ontario
Top 38% Nationally#8 of 12 in Ontario
Boston Qualifier Rate7th highest BQ percentage in Canada
Ranked 5th highest BQ percentage in Ontario
Based on 2025 Boston Marathon qualifying results
Top 24% Nationally#5 of 10 in Ontario
Race Size19th largest marathon in Canada
Ranked 7th largest marathon in Ontario
Based on 2025 results
Top 58% Nationally#7 of 11 in Ontario

Learn more about PR Scores and Course Scores on the FAQ page.



Elevation Chart


Max Elevation: 296 feet (90m)
Min Elevation: 155 feet (47m)

Elevation Gain: 453 feet (138m)
Elevation Loss: 537 feet (163m)


St.



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Compare the St. Lawrence Marathon to other Marathons

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Race Reviews


4.0
Based on 2 reviews
Write Your Own Review

Hilly but Scenic

Full Review:

There were a lot more hills than anticipated - but views were great. There were a lot of paths that were with a lot of cracks and not even, so ankles felt that. Lots of water and gel stations!
Reviewed by SR About 2026

St. Lawrence Marathon

Full Review:

Beautiful course. Most of the course is on a bike path which is in good condition, and the only road section was extremely scenic with no traffic at all. Very well organized with plenty of well-staffed aid stations every 3 km or so. Obviously you don't get much crowd support at a race this small, but there were a handful of extra people cheering at every aid station. Only downside is that the wind coming off the river is pretty significant. We had a headwind the whole way this year but I imagine the course would be PR material with a tailwind.

Race Tips:

The course doesn't feel quite as flat as it looks on the profile. There were lots of short but steep rollers around kms 25-35. Despite being net downhill that section felt the hardest.
Reviewed by CB About 2023