
The 100 km of the Canalathon Ultra is an out-and-back on the Rochdale Canal towpath, leaving Sowerby Bridge Cricket Club through rural Yorkshire towards Manchester and coming home the same way. Hills hardly matter here; what decides the day is whether you can keep running and eating evenly from morning to evening.
The race starts and finishes at Sowerby Bridge Cricket Club. From there the route follows the canal through the towns and countryside of rural Yorkshire, heads on towards Manchester and turns at halfway. The second half retraces the first, so every section is run twice and on the way back you know exactly what is still ahead.
The profile is flat. Around 370 m of climbing is spread across the whole day, and the only rise worth the name comes just after the start: a few hundred metres at under four percent. The canal climbs to its summit near Todmorden and falls away beyond it, so the height arrives in long, barely noticeable ramps rather than at any single hill.
Underfoot it is towpath almost throughout, with the water beside you. Aid stations are published at 12.5, 25, 37.5 and 50 km, an even spacing that breaks the day into manageable blocks. The race is held in early April as part of a spring running festival on the canal that also offers a 50 km, a half marathon and a 10 km.
| Start | Length | Ø | Max. | Gain | Cat. |
|---|---|---|---|---|---|
| km 0.3 | 0.3 km | 3.7 % | 4.7 % | +12 m | — |
Climb categories follow the road-cycling convention and rate the terrain itself (length and gradient) regardless of sport: Cat. 4 marks the easiest rated climbs, Cat. 1 the hardest, and HC (hors catégorie, “beyond categorization”) is reserved for the most brutal ascents. Short climbs below the Cat. 4 threshold stay unrated.
A flat course has no climbs to slow you down, and that is exactly the trap. On a towpath a pace that is too fast feels effortless for the first few hours, and nothing in the terrain forces a walk break. Set a pace for the full 100 km and hold it by effort, not by how fresh your legs feel early on.
The aid stations at 12.5 km intervals give the day its rhythm. Treat each block as its own piece with a fixed eating and drinking routine, rather than trying to catch up with large amounts at the tables.
The race is decided on the return leg, when you run the same kilometres a second time and the route has nothing new to offer. If you saved energy before the turn you can keep the same rhythm all the way home; if you went out too fast, the long straight stretches back to Sowerby Bridge are where the time goes.

For most age-group runners the distance means somewhere between ten and sixteen hours on the move. The effort is almost entirely aerobic and very uniform: hardly any climbing, no technical ground, just a long time in the same movement on the same surface.
That sets the main emphasis: long runs on flat, even ground at a pace you can hold for hours. Flat paths and riverside trails are the right training terrain, because your muscles need to be ready for one repeated movement rather than for hills. Back-to-back long runs on consecutive days teach you what the second half will feel like.
The deciding phase is the return leg after the turn. Practise holding your pace through the last third of a long run instead of finishing fast. There is a mental side as well: run parts of your long sessions out and back on familiar routes so that covering the same ground twice feels normal.
Practise fuelling the way the race dictates it, a station every 12.5 km and whatever you carry in between. With the race in early April, most of your build falls in winter; schedule the longest sessions so that short days and cold weather do not cut them down.

Download the Canalathon Ultra course as a GPX file for your watch or bike computer.
Ben connects your goal, the course, current load, recovery, and calendar. Your plan stays pointed at race day even when real life is not perfectly plannable.
Canalathon Ultra is 100 km long. That distance shapes how much aerobic endurance, pace durability, and race-specific work belong in the training plan.
Canalathon Ultra has around 367 m of elevation gain over 100 km. That affects pacing, muscular load, and preparation for late-race sections.
Canalathon Ultra is classified as Flat, averaging 3.7 vertical metres per kilometre. 72% of the route is flat, 14% climbs moderately (2 to 6%) and 0% is steeper than 6%.
The hardest climb of Canalathon Ultra starts at kilometre 0.3, runs for 0.3 km at an average of 3.7% and gains 12 metres.
Yes, Canalathon Ultra is laid out as a loop: start and finish are in the same place.
Yes. The Canalathon Ultra course is on this page as a free GPX download — ready to import into Garmin, Wahoo, Komoot, Strava or any other app that reads GPX.
Preparation for Canalathon Ultra should account for 100 km, 367 m of elevation gain, current training load, and available training time. An adaptive plan helps place key sessions without ignoring recovery and real life.
The pacing strategy for Canalathon Ultra should reflect 100 km, 367 m of elevation gain, and your current fitness. Start controlled and keep margin for sections where the profile or fatigue makes target pace harder.
Canalathon Ultra takes place on April 4, 2027.
Canalathon Ultra takes place in Sowerby Bridge, United Kingdom.
Canalathon Ultra offers 4 distances — 100 km: 100 km; 50 km: 50 km; Half Marathon: 21.1 km; 10 km: 10 km.
Registration runs through the organiser: canalathon-ultra.co.uk. YOUB shows you the course, elevation profile and training plan for your preparation.