The 70.3 Calgary Half Marathon: Two Laps Along the Bow River, Gravel, and a 17% Ramp

The Course

21.1 km over two 10.5 km laps along the Bow River, finishing at the Historic Ranche in Cochrane. The listed elevation gain is 528 feet, about 161 meters. Reading that, it sounds nearly flat. It isn't, and the 2026 race reports are unanimous: for many, it was the hardest leg of the race.

The reason is a combination of three factors: mixed terrain, two real climbs per lap, and environmental conditions that can take a toll (afternoon heat, altitude, and in some weeks, wildfire smoke).

The Terrain: This Is Not a Road Half Marathon

The course alternates between fine gravel, rolling trail, a tunnel under a creek, a dirt road through the pines, and the Bow River multi-use pathway. Translation: your pace will never be steady, and your splits per kilometer will bounce around even where the profile is flat.

A practical gear choice: a race shoe with good grip and some protection. Extreme super-shoes with a stiff plate perform worse on gravel and rolling trail; if you have a more stable, versatile model, this is its day. Test it in training on similar surfaces before deciding.

The Two Climbs, Twice

Each lap has two key sections:

• The long switchback climb, structured in three tiers. There's an aid station at the top, nicknamed "Hillbilly Hollow." This is a climb to manage, not attack: short cadence, active arms, and use the aid station at the top to restart with a clear head.
• The short, very steep ramp, around 17%. On grades like this, running or power-walking costs nearly the same: if you're not fighting for an age-group podium, walking the ramp with a determined stride is a rational choice, not surrender.

You do both twice. The second pass, around km 15-18, is where the race is won or broken.

Heat, Altitude, and Air Quality

The weather is highly variable: typical highs around 29°C, but cool mornings around 15°C. Athletes coming off the bike at midday may find themselves running in the hottest hours. The finish area is shaded by pines, but most of the course is not: plan your hydration from the first aid station, not from when you feel thirsty.

The 2026 reports also mention altitude and wildfire smoke as factors that took their toll. You can't do anything about it on race day, but you can adjust expectations: if the AQI is high during race week, your goal time needs revising.

Pacing: The First Lap Is a Recon

Strategy backed by the facts:

1. First lap in control, 10-15 seconds per km slower than your goal pace. The course will quickly tell you if the plan holds up. 2. The 17% ramp: decide in advance whether to run or walk it, so you don't make the call on impulse during the second lap. 3. Aid stations as checkpoints: the one at the top of the big climb is your reference point to drink and reset. 4. Second lap by feel, with any progression only after the final ramp.

Ballpark times range from 1:32 to 2:35 depending on your level: our estimates, not official ones. On this terrain, add a few minutes to your road half marathon benchmark.

What to Do Between Now and Race Day

• Include short, steep hills (30-60 second repeats) and technical descents in your run training.
• Do at least one long run on gravel and light trail in the shoes you'll race in.
• If you arrive early, recon the switchback climb and the ramp: knowing them completely changes how you manage the first lap.
• Prepare a heat plan B: ice or water over your head at aid stations if the afternoon climbs above 27°C.