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Ultra Marathons Found In Ontario

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Ultra Marathons in Ontario 2025 - 2026

The most comprehensive list of Ultra Marathons in and near Ontario in 2025 - 2026. Find your perfect race!

Race Calendar: Ultra Marathons Found In Ontario

Conquer The Canuck

Cambridge, ON
10 May 25

Coach D's Backyard Ultra and Trail Race

Kawartha Lakes, ON
17 May 25
$110.15 - $196.46

Sulphur Springs Trail Race 2025

Hamilton, ON
24 May 25
Free - $838.45

Spin the Lakes

Huntsville, ON
24 May 25
$110.15

Baden Running Races 2025

Baden, ON
25 May 25
Free - $61.07

H+P THIS MAY BE LOOPY ULTRA

Waterloo, ON
31 May 25
Free

2025 Forest City Cycling Challenge

London, ON
01 Jun 25
$131.73 - $164.10

Rainbow Trail Run 2025

Simcoe County, ON
14 Jun 25
Free - $122.07

Waterloo 10 KM Classic 2025

Waterloo, ON
14 Jun 25
Free - $83.94

Tanya's Ride for Brain Injury

Palgrave, ON
14 Jun 25
$7.64

Couch To a Voyageur

North Bay, ON
15 Jun 25
$130.23

Niagara Ultra 2025

Niagara-on-the-Lake, ON
21 Jun 25

EyeRide 2025

Vaughan, ON
21 Jun 25
$26.84 - $53.67

Run For the Kids 2025

Morpeth, ON
22 Jun 25
$23.83 - $56.20

FitFarm Little Loop Ultra

Strathroy, ON
22 Jun 25
$23.83 - $56.71

Summit 700 Trail Runs

Grey County, ON
05 Jul 25
$1.50 - $407.53

Cornwall Multisport Club - Kids Day 2025

Cornwall, ON
05 Jul 25
Free

BIG Gravel Grind

Thedford, ON
06 Jul 25
$142.76 - $164.55

The First Blaze Trail Race 2025

Milton, ON
12 Jul 25
Free - $122.07

The 2025 ENDURrun Sport 80 KM

Conestogo, ON
13 Jul 25
$45.82 - $329.03

2025 Lindsay Milk Run

Kawartha Lakes, ON
20 Jul 25
$23.83 - $61.59

Cornwall Multisport Club - Open Water Swim 2025

Cornwall, ON
25 Jul 25
$10.00

Tally in the Valley Trail Race 2025

Hamilton, ON
26 Jul 25
$73.05 - $220.10

Persistence Backyard Ultra

Arva, ON
02 Aug 25

Bluewater International Gran Fondo 2025

Sarnia, ON
03 Aug 25
$82.36 - $158.16

Middle Path Trail Race

Peterborough County, ON
09 Aug 25
$23.83 - $110.15

2025 Gran Fondo Lake Huron

Southampton, ON
16 Aug 25
$28.49 - $180.11

Mudskipper Canadian Individual SwimRun Championships and Parry Sound 15K Ultra Swim

Parry Sound, ON
17 Aug 25
$4.00 - $214.65

The Runway 2025

Breslau, ON
30 Aug 25
Free - $45.82

Haliburton Forest Trail Race 2025

Haliburton, ON
06 Sep 25
Free - $223.43

Grey Highlands Gran Fondo

Markdale, ON
06 Sep 25
$75.89 - $139.72

Welland Canal Open Water Swim

Welland, ON
07 Sep 25
$99.36 - $120.94

Rodney Fair Road Race

Rodney, ON
14 Sep 25
Free - $45.41

The Wolfpack Ultra Championship

Hamilton, ON
20 Sep 25
$56.20 - $115.54

Monster of Mazinaw Trail Race 2025

Cloyne, ON
20 Sep 25
$78.50 - $100.28

Monarch Ultra 10km

Peterborough, ON
20 Sep 25
$23.83 - $72.38

Rotary Tour de Dundas Gran Fondo 2025

Dundas, ON
21 Sep 25
$29.23 - $131.73

Essex Region Conservation Bike Tour 2025

Kingsville, ON
27 Sep 25
$13.04 - $88.57

Run Off-the-Grid

Mattawan, ON
27 Sep 25
Free - $394.39

BLUE BULLY ULTRA

Blue Mountains, ON
03 Oct 25
$30.00 - $445.00
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