Tamarack Ottawa Race Weekend 2027: The Complete Race Guide

Ottawa’s marathon weekend is one of those races that earns runner loyalty the hard way: not through brute spectacle or world-city status, but through the quiet accumulation of a thousand things done right. A flat, fast course that crosses a provincial border. A UNESCO World Heritage canal at your feet for the first six kilometres. Parliament Hill on the horizon as you come back over the Alexandra Bridge around the 23-kilometre mark. And the kind of crowd support — 28 official cheer stations, more than any marathon on the planet claims — that makes a tired runner feel like they’ve done something worth celebrating.

The 2027 edition is the 51st running of an event that began in 1975 with 146 runners on a drizzly May Sunday. It is now Canada’s largest running and walking festival, pulling 16,800 participants across a weekend of six races. For international runners, it is still one of the more underrated major marathons anywhere — a World Athletics Elite Label event with a total prize purse north of CAD $240,000, held in a capital city compact enough that you can walk from your hotel to the start line without a bus.

The 2026 edition, which marked the 50th anniversary of the race, went off in cold, wet conditions with standing water on the road and gusting winds. Kenya’s Elvis Cheboi won in 2:09:22; Sweden’s Abeba Aregawi — a former 1500m world champion who had reinvented herself as a marathon runner — won the women’s race in 2:23:12, a new Swedish national record. That the times were as fast as they were, in conditions that chased away any realistic talk of course records, tells you something about the calibre of field this race attracts.

For recreational runners, the draw is simpler. The course is designed for personal bests. The 7-hour time limit is generous. The expo is Canada’s largest health and fitness show. And finishing under the shadow of Ottawa City Hall — medal in hand, a beer garden waiting in Festival Plaza — is as clean a race-day experience as you’ll find anywhere in North America. If you’re planning to toe the line in May 2027, this guide covers everything you need to know.

Race at a Glance

What Makes Tamarack Ottawa Race Weekend Worth Running?

It Is a Festival First, a Marathon Weekend Second

Most races give you a start line and a finish line. Ottawa gives you an entire weekend. Saturday kicks off with the Ottawa 10K — which doubles as the Canadian 10K Championships, one of the few events anywhere that puts club runners and national-team athletes on the same start line — plus the 5K, 2K and Kids Marathon. Sunday is for the big stuff: the half-marathon and the full. If you want to take it further, the multi-event challenges (17 km, 36.1 km and 59.2 km) let you combine races across both days, stacking distances that would make your training plan blush.

The Desjardins Charity Challenge is woven through the whole thing. In 2025, runners raised just under CAD $970,000 for local and national charities. The fundraising angle isn’t bolted on as an afterthought — it’s genuinely built into the culture of the race, and if you run for a charity team you’ll feel that in how much the crowd cheers for you.

The Course Crosses a Provincial Border — and Looks Like a Capital City

There are marathons with better skylines. There are marathons with bigger prize money. But not many can say the race route crosses from one Canadian province into another and back, all within a single 42.195 km lap. The pivot point is Gatineau, Quebec, sitting directly across the Ottawa River from the capital. You cross into Quebec via the Chaudière Bridge around the 18–19 km mark, run through Gatineau past the Canadian Museum of History and the Tour Eiffel Bridge, then return to Ottawa via the Alexandra Bridge with a view of Parliament Hill dead ahead that genuinely stops you mid-stride. From there you’re running past Sussex Drive — past the Prime Minister’s residence on your left and Rideau Hall on your right, through the actual grounds of the Governor General’s estate — before looping back downtown.

That’s not a race-brochure description. That’s the actual route.

It Is a Legitimate BQ Course — With Caveats

Ottawa has a 10.9% Boston qualifier rate (2024 data), which is respectable for a course of its size. The elevation profile is genuinely flat from the gun — the first 20 km along the Rideau Canal and Ottawa River parkway are about as benign as a road marathon gets. But the course does ask something of you from km 30 onwards in Rockcliffe Park, and Ottawa’s late-May weather has a reputation for warming up fast once the clouds clear. Pick a cool-condition year (as 2026 was) and the times can be outstanding. Pick a hot year — and Ottawa earns its “Hottawa” nickname regularly — and you run on feel, not the clock. Plan for both.

28 Cheer Stations: More Than Any Marathon in the World

The official claim is that Ottawa has more cheer stations per marathon route than anywhere else. Having run past them, it’s hard to argue. Ottawans turn out. The Westboro/Hintonburg strip around the 10–14 km mark is reliably electric. The Sussex Drive section has a different energy — quieter but emotionally heavy, surrounded by landmarks. And the downtown finish back along the Rideau Canal, with half-marathon runners joining the full-marathon field in the final few kilometres, creates a wall of noise that carries you across the timing mat when you have nothing left in your legs.

The Expo Is Canada’s Largest Health and Fitness Show

Bib pickup is at the Running and Fitness Expo at Carleton University Fieldhouse, a three-day event free to the public. North American exhibitors fill the space with gear, nutrition brands, running apparel and recovery products. If you’re travelling from overseas and need last-minute race supplies — gels, tape, replacement kit — this is a reliable source. It also runs the Friday before Sunday’s marathon, so there’s no excuse to be scrambling on race morning.

Who Should Run This Race

Ottawa suits a specific type of runner very well: the serious recreational runner who wants a world-class race experience without the lottery system, crowd chaos or four-figure entry fee of a World Marathon Major. If you’re chasing a BQ on a flat course in a city with solid infrastructure, this is your race. If you’re a Canadian runner who wants to race on home soil against a genuine elite field, this is one of two places in the country where that happens (Toronto Waterfront being the other). And if you’re an international runner looking for a North American race that combines historical scenery, a competitive field and strong logistics, Ottawa delivers all of it — in a city that is walkable, welcoming and considerably cheaper than London or New York race weekend.

If you’re coming for a first marathon and primarily want crowd support from the first kilometre to the last, the half-marathon might be a better fit. The full marathon does have quiet stretches in Rockcliffe from km 30 to 38 where the support thins out noticeably.

The Course — Mile by Mile

Km 0–6: Rideau Canal — Flat, Fast and Crowded

The gun goes off at Ottawa City Hall at 7:00 AM. The field is big enough to take a minute or two to clear the start area, so don’t panic if your opening pace is sluggish. Within the first half-kilometre you settle onto Colonel By Drive running south along the Rideau Canal — a UNESCO World Heritage Site that in winter becomes the world’s largest natural ice-skating rink, and in late May is lined with tulips and spectators.

The first six kilometres are as flat as it gets. This is where you establish your rhythm and nothing more. Just before the 3 km mark you cross the Pretoria Bridge for the first time. There’s a slight incline on the approach — short but worth knowing so it doesn’t catch you off guard when you’re fresh and prone to ignoring feedback from your legs. The Rideau Canal section is well-supported and the first place many runners go out 10–15 seconds a kilometre too fast. Resist it.

Km 6–18: Ottawa River Parkway (Kichi Zībī Mīkan) — Wind and Westboro

From around km 6 the course swings west and north onto the Kichi Zībī Mīkan (formerly the Sir John A. Macdonald Parkway), a scenic riverside road that follows the Ottawa River. This section is mostly clear of trees and open to the river, which means when there is a west or northwest headwind — and in May there often is — you will feel every metre of it. The elevation is still flat but the exposed ribbon of road extracts a cost that won’t show on any elevation profile.

The Westboro and Hintonburg neighbourhoods (around km 10–14) are where the crowd energy ramps up again. These are the Ottawa suburbs that really turn out for race weekend. Live bands, cheer squads and spectators spilling off the pavement — this is the most reliably energetic spectator stretch on the full-marathon course. Enjoy it, because it gets quieter from km 18 onwards.

Km 18–25: Gatineau, Quebec — Two Countries, One Race

Around km 18–19 you cross into Gatineau, Quebec via the Chaudière Bridge. The bridge approach is mild but the psychological lift of crossing a provincial border mid-race is real. Gatineau itself is more residential and commercial than the Ottawa side — fewer landmarks to focus on, less crowd support, and a section that even experienced Ottawa runners describe as something to work through rather than savour.

The Canadian Museum of History sits on the Gatineau bank of the Ottawa River. The Tour Eiffel Bridge (Montcalm Street Bridge, built with a repurposed Eiffel Tower girder) is a quirky landmark in the middle of the Gatineau section. The return to Ottawa comes via the Alexandra Bridge at around km 23–24. This is a steel truss cantilever bridge that has been closed to vehicles since 2023 and is now pedestrian and cycling only — meaning you cross it in a single narrow lane. It’s brief, it has a slight camber, and when you reach the Ottawa side the view of Parliament Hill directly ahead is the kind of landmark that makes you briefly forget your legs are tired. Use it.

Km 25–30: Sussex Drive — History on Your Left and Right

Back in Ottawa, the course passes the National Gallery of Canada (with the giant Louise Bourgeois spider sculpture out front), Kìwekì Point — the viewpoint behind the National Gallery with the best panoramic view of Parliament Hill on the course — and then heads along Sussex Drive for two consecutive passes. Between km 28 and 29, 24 Sussex (the Prime Minister’s residence) is on your left and Rideau Hall (the Governor General’s estate) is on your right. The course actually runs through the Rideau Hall grounds. If the thought of running past where the Governor General lives doesn’t give you a small involuntary sprint, you might be too tired.

This section has decent crowd support around the Rideau Hall/Sussex strip. Pace should still feel controlled here. Anyone running their goal pace comfortably at km 28 is doing well. Anyone who is already struggling here will have a very long next 14 kilometres.

Km 30–38: Rockcliffe and the Cartier Parkway — Where Races Fall Apart

This is the decisive segment of the Ottawa Marathon. The Sir George-Étienne Cartier Parkway (formerly Rockcliffe Parkway) is scenic — riverside views, covered lookout platforms over the Ottawa River — but it is also the loneliest, most rolling section of the course. The elevation bumps here are not dramatic. On the elevation chart they look minor. But at km 32 with 10 kilometres still to run, legs that have been flat-road running for an hour and a half suddenly encounter repeated gentle inclines that feel much harder than they should.

Crowd support in Rockcliffe Park is thin. There are cheer stations but the spectator density drops sharply compared to the canal and river sections. This is where most recreational runners lose two to five minutes relative to their first-half pace, and where negative splits go to die. The parkway sections also remain partially exposed to wind. If you are going to run conservatively anywhere on this course, it is through km 6–18 so that km 30–38 does not destroy you.

Km 38–42.2: The Downtown Return — Legs and Noise

The final four kilometres bring you back through Sandy Hill and downtown Ottawa. Around km 38 the half-marathon field merges with the full-marathon runners coming back from Rockcliffe. The half-marathoners will be running considerably faster at this stage — they started later — so stay left and give them room. In years where the gap between marathon and half-marathon start times has been shorter, this merge has caused some congestion.

The course passes the University of Ottawa, Rideau Centre and turns south along the canal for the final run to the finish at Ottawa City Hall. The Pretoria Bridge crossing for the second time is around km 40, and from there the finish line comes into view with crowd energy building again after the quiet of Rockcliffe. The spinning finisher medal is waiting. So is the Farm Boy recovery zone and the Beyond the Pale beer garden in Festival Plaza. Finish strong.

Registration — Tamarack Ottawa Race Weekend 2027

Run Ottawa membership discount: A Run Ottawa membership saves 10% across all events. Membership is purchasable during registration checkout. Individual, dual, youth and family options are available. For runners doing multiple events across the year, it pays for itself quickly.

Green Bib option: Available at registration for the marathon. Choosing Green Bib means no finisher medal, no mailed amenities — the saved cost goes to the Desjardins Charity Challenge. A meaningful option if you run races for the effort rather than the hardware.

Personalized bibs: Register before May 1, 2027 to have your first name printed on your bib.

Registration link: Register via Let’s Do This (linked from runottawa.ca)

Race Weekend Schedule 2027

Exact start times for Saturday races and the half-marathon will be published on runottawa.ca/torw/plan/schedule closer to race weekend. Check the official schedule — times shift slightly year to year.

Weather: What to Expect in Ottawa in Late May

Ottawa earns the “Hottawa” nickname because late May can flip from cold and grey to warm and sunny within 48 hours. The 2026 race was a notable exception — 10°C, standing water on the road and intermittent rain kept the field honest and helped produce a 2:09 winning time on a race day that organisers had originally hoped might threaten the course record. Most years, though, the final 10–12 kilometres are run in conditions that are warmer than ideal for marathon performance. The exposed river parkway sections and the Rockcliffe stretch have no canopy cover, so when the sun comes out it comes out directly on you. Cooling and misting stations are available on course. Hydrate at every station from the gun regardless of how you feel — the riverside location is deceptively drying even when conditions seem mild.

Prize Money and Elite Information

Past Results — Defending Champions

★NR = National Record. Abeba Aregawi’s 2:23:12 victory in 2026 was a new Swedish national marathon record, remarkable context given she ran it in cold, rainy conditions with standing water on the road. Aregawi is a former 2013 World 1500m champion and 2012 Olympic silver medallist at 1500m who transitioned to marathon racing. Second in the men’s race was Ethiopia’s Gizealew Ayana (2:09:26), four seconds back. Canada’s Rory Linkletter — a 2024 Olympian and national half-marathon record holder — took third in 2:09:43. Four men finished sub-2:10, which is an unusually deep field for a non-Major. Full official results at sportstats.one.

Spectator Guide — Where to Watch Tamarack Ottawa Race Weekend

Where to Stay for Tamarack Ottawa Race Weekend

Ottawa’s downtown core is compact. Most hotels within a 2–3 km radius of Ottawa City Hall put you at walking distance from the start, the expo and the post-race festival. Book early — race weekend fills fast and prices spike significantly in the weeks before.

International Runners — Visa and Getting to Ottawa

A Short History of the Ottawa Marathon

The race started in 1975 with 146 runners — 143 men and three women — on a Sunday morning in late May. Jim Robinson joined as race director in 1996 and shaped the event into the festival model it operates under today. The 1998 edition added the half-marathon and made Ottawa the first running event in Canada to use chip timing, which sounds like a small administrative detail until you remember that chip timing is now table stakes at every road race in the world. Ottawa was first.

The race grew through the 2000s and into the 2010s in scale and in status. The 10K received IAAF Gold Label certification in 2014, the first road race in Canada to earn it. The marathon followed in 2015. In 2023, World Athletics restructured its road race labelling and the Ottawa Marathon was reclassified as an Elite Label event — one tier below Gold — where it currently sits. The weekend was named Event of the Year at the 2019 Canadian Tourism Awards. In 2025, charity fundraising through the Desjardins Charity Challenge passed nearly CAD $970,000 for the year, meaning the race has become a genuine fundraising vehicle as well as a sporting event.

The 2026 race was the 50th running of the marathon — a milestone edition that drew a field deep enough to produce four men under 2:10, in conditions that had race directors originally worried about having to scale back finish-time goals. Abeba Aregawi’s victory in 2:23:12, a Swedish national record set on a wet and windy course, added a chapter to the race’s history that nobody saw coming. The 2027 edition is the 51st running and the first after a major course redesign cycle, with a route that crosses two provinces and passes landmarks that no other marathon in Canada can match for sheer density of national significance.

How Tamarack Ottawa Race Weekend Compares