Enter your goal time. Get hill-adjusted, mile-by-mile splits built from actual GPX course data — including the Ambassador Bridge crossing, the only underwater mile in marathon running, and the flat finish through historic downtown Detroit that rewards runners who stay disciplined through two countries.
The Detroit Free Press Marathon is the only marathon in North America that crosses an international border. The course starts in downtown Detroit, crosses the Ambassador Bridge into Windsor, Ontario at sunrise, runs through Canada's waterfront, returns through the Detroit-Windsor Tunnel — the only official underwater mile in marathon running — and finishes through Detroit's historic neighborhoods. It's been voted "Best Marathon in the U.S.," and with a Course Score of 99.12 and just 59 feet of total climbing, it's one of the flattest and fastest marathon courses anywhere.
This calculator solves the pacing problem that flat courses create: without terrain forcing you to slow down, the temptation to go out too fast is constant. Enter your goal time, set how aggressively you want to handle the minimal elevation changes, and you'll get a target pace for every mile that closes exactly to your goal — accounting for every foot of climb and drop from Fort Street to the Campus Martius finish.
Enter your goal time and effort level. Your personalized mile-by-mile splits appear instantly.
Results appear below. No email required.
| Mile | Elev | Effort | vs Goal Pace | Target Pace (min/mi) |
Pace Bank | Elapsed |
|---|
Elevation data from official Detroit Free Press Marathon GPX course file, 15-point smoothed. Uphill penalty applied above +0.4% grade; downhill benefit applied below −0.75% grade. Math closes exactly to goal time.
Fort Street to the Ambassador Bridge, through Canada, back through the tunnel, and home through Detroit's historic neighborhoods — where the international crossing defines the race and the flat terrain rewards disciplined pacing.
The race starts on Fort Street near the Ambassador Bridge in downtown Detroit. The first mile is flat and fast — adrenaline from 8,000+ marathoners filling the pre-dawn streets makes it easy to go out too hard. Mile 2 takes you onto the Ambassador Bridge itself, the signature moment of the race. You're running across an international border at sunrise with the Detroit skyline behind you and Windsor, Ontario ahead. The bridge is essentially flat — no meaningful elevation change despite the dramatic setting.
Mile 3 brings a gentle +5 ft rise as you descend into Windsor. Miles 4 through 7 run along Riverside Drive and the Windsor waterfront with the Detroit River on your right and the Detroit skyline across the water. The terrain is flat, the crowds are enthusiastic, and the Canadian section has a distinctly different atmosphere from the American side. Mile 6 has a +6 ft rise along the waterfront, and by mile 7 you're approaching the tunnel entrance with a +3 ft climb. These are essentially flat miles — the elevation changes are barely perceptible.
Mile 8 is the Detroit-Windsor Tunnel — the only official underwater mile in marathon running. The course descends -14 ft as you drop beneath the Detroit River, running through the tunnel with thousands of other runners. The acoustics are surreal — cheering echoes off the tunnel walls, and the fluorescent lighting creates an otherworldly atmosphere. It's a singular moment in distance running. Mile 9 brings you back to the surface with a +4 ft rise as you emerge into Mexicantown, one of Detroit's most vibrant neighborhoods.
Miles 10 through 14 take you through Detroit's historic core. Corktown at mile 10 (+7 ft), Michigan Avenue at mile 11 (+8 ft — the biggest climb on the entire course), and Woodbridge at mile 12 (+4 ft) are all gently rolling but nothing that requires adjusting your effort. The halfway mark falls around mile 13 in the District Detroit, near Comerica Park and Ford Field. Mile 14 is flat through Midtown. The elevation changes in this section are so small they're essentially imperceptible — but the calculator still accounts for every foot.
Mile 15 drops -5 ft as you enter Indian Village, one of Detroit's most beautiful residential neighborhoods. The grand early-twentieth-century mansions lining the streets are a striking backdrop as you settle into the back half of the marathon. Mile 16 through West Village is essentially flat (+1 ft), and mile 17 climbs +7 ft as you approach the Eastern Market area. This is gentle terrain — none of these elevation changes would register as a hill on fresh legs.
Miles 18 and 19 have the biggest descent on the entire course. Mile 18 drops -14 ft along the Dequindre Cut, and mile 19 continues the descent with another -14 ft through Rivertown. Combined, that's -28 ft of descent in two miles — the most significant terrain feature on an otherwise perfectly flat course. Mile 20 levels out at Jefferson Avenue (+2 ft), and mile 21 has a gentle +4 ft rise along the East Riverfront with the Detroit River on your left and the Renaissance Center ahead. This is where the race begins to feel like a homecoming.
Mile 22 is flat as you approach downtown Detroit, and the city skyline fills the view ahead. Mile 23 drops -2 ft down Woodward Avenue — Detroit's most iconic boulevard. The crowd support builds here as spectators line the street and the finish festival energy reaches you. Mile 24 continues the gentle descent through Grand Circus Park (-4 ft), and mile 25 is essentially flat along Washington Boulevard (-1 ft).
Mile 26 brings a final +2 ft rise through Campus Martius — barely a bump, but at mile 26 everything feels harder than it is. The final 0.2 miles are flat to the finish line. The Detroit finish is one of the most celebrated in American marathon running — you've run through two countries, under a river, through a dozen historic neighborhoods, and you're crossing the line in the heart of a city that's earned every bit of its comeback story. The crowd support at the finish is electric.
Mid-October in Detroit means cool to cold mornings with variable conditions. Here's what runners have faced in recent years.
| Year | Start Temp | Finish Temp | Humidity | Wind | Conditions |
|---|---|---|---|---|---|
| 2024 | 55°F / 13°C | 62°F / 17°C | 72% | 8 mph SW | Ideal |
| 2023 | 31°F / -1°C | 45°F / 7°C | 58% | 5 mph N | Cool |
| 2022 | 35°F / 2°C | 48°F / 9°C | 65% | 10 mph W | Cool |
| 2021 | 38°F / 3°C | 52°F / 11°C | 70% | 7 mph S | Cool |
| 2020 | 42°F / 6°C | 55°F / 13°C | 60% | 6 mph E | Ideal |
Temperatures at start (7:00 AM) and finish (~10:00–1:00 PM). Detroit's mid-October weather is highly variable — plan for anything from near-freezing to mid-50s at the start line. Dress in layers you can shed.
One of the flattest, fastest, and coolest marathon courses in North America — with a Course Score and PR Score of 99.12.
The Detroit Free Press Marathon is one of the best Boston Qualifying courses in the country. The numbers make the case on their own: a Course Score of 99.12, a PR Score of 99.12, just 59 feet of total climbing over 26.2 miles, and mid-October temperatures that typically range from the low 30s to the mid-50s at the start. Cool weather and flat terrain is the formula for fast marathons, and Detroit delivers both.
The BQ rate reflects the course quality: 5.7% in 2024, 7.4% in 2023, and 8% in 2022. Those numbers are competitive with dedicated BQ-chaser courses like Erie, Grandma's, and Indianapolis. The international crossing adds logistical complexity — you need a passport or enhanced driver's license — but it doesn't add difficulty. The Ambassador Bridge is flat, the tunnel is slightly downhill, and the rest of the course is as flat as any urban marathon in America.
The primary risk factor is the cold. A 31°F start (2023) demands different gear and fueling strategy than a 55°F start (2024). Runners who fly in from warmer climates and don't prepare for sub-freezing temperatures can lose significant time to cold-stiffened muscles and wind chill on the bridge. Use the calculator with your buffer-adjusted goal time, dress for the forecast, and run the flat terrain with patience — Detroit will give you a fast time if you don't force it.
| Age Group | Men | Women | Non-binary |
|---|---|---|---|
| 18–34 | 3:00:00 | 3:30:00 | 3:30:00 |
| 35–39 | 3:05:00 | 3:35:00 | 3:35:00 |
| 40–44 | 3:10:00 | 3:40:00 | 3:40:00 |
| 45–49 | 3:20:00 | 3:50:00 | 3:50:00 |
| 50–54 | 3:25:00 | 3:55:00 | 3:55:00 |
| 55–59 | 3:35:00 | 4:05:00 | 4:05:00 |
| 60–64 | 3:50:00 | 4:20:00 | 4:20:00 |
| 65–69 | 4:05:00 | 4:35:00 | 4:35:00 |
| 70–74 | 4:20:00 | 4:50:00 | 4:50:00 |
| 75–79 | 4:35:00 | 5:05:00 | 5:05:00 |
| 80+ | 4:50:00 | 5:20:00 | 5:20:00 |
Boston Qualifying standards are minimum requirements, not guarantees of entry. Because more runners qualify than there are spots, the BAA cuts at a time buffer — historically between 30 seconds and 6 minutes below the standard. In recent years, the buffer has been around 2–3 minutes. If you're targeting 3:00:00 for men 18–34, you likely need to run 2:57–2:58 to actually get in. Use the calculator with your actual buffer-adjusted target time, not just the BQ standard.
Everything you need to know about race weekend in Detroit — from the expo to the international crossing.
The Detroit Free Press Marathon weekend includes multiple distances across two countries. The Health & Fitness Expo runs Friday and Saturday at Huntington Place (formerly Cobo Center), where you pick up your bib and race kit. The marathon starts Sunday at 7:00 AM from Fort Street near the Ambassador Bridge. Arrive at least 60 minutes before gun time — the international crossing logistics require extra staging time, and bag drop closes early.
The expo is held at Huntington Place in downtown Detroit, walking distance from most downtown hotels. Friday hours are typically noon to 8 PM, Saturday 9 AM to 6 PM. Packet pickup requires photo ID and your registration confirmation. The expo features gear vendors, nutrition sponsors, and pace team meetups. The race merchandise sells out quickly — shop early if you want specific items.
The start line is on Fort Street near the Ambassador Bridge in downtown Detroit. Most downtown hotels are within walking distance. Parking is available in downtown garages but roads close early Sunday morning. The People Mover and QLINE streetcar don't run early enough for the 7:00 AM start, so plan to walk or use rideshare. Drop-off zones are designated near the start — check the race website for the current year's traffic plan.
If driving, plan to arrive by 5:30 AM. Road closures begin well before race time and downtown parking fills quickly with 26,000+ participants across all distances.
Aid stations are positioned approximately every 1.5 miles on both the American and Canadian sides of the course. Water is available at all stations, electrolyte drinks at select stations, and energy gels at designated miles. Medical stations are positioned throughout, including at the tunnel entrance and exit. The Canadian section has its own aid stations staffed by Windsor volunteers — the support on both sides of the border is excellent.
The finish line is at Campus Martius Park in the heart of downtown Detroit. The finish festival includes food vendors, live music, a beer garden, massage tents, and a large reunion area. Bag check retrieval is near the finish. The post-race atmosphere is one of the best in American marathon running — you've just run through two countries and under a river, and the crowd celebrates that accomplishment.
Finisher medals, mylar blankets, and post-race refreshments are distributed immediately after crossing the line. The "I Ran the International Marathon" merchandise is a popular post-race purchase.
Downtown Detroit hotels are ideal — the Marriott at the Renaissance Center, Detroit Foundation Hotel, Shinola Hotel, and Aloft Detroit are all within walking distance of both the start and finish. Book early as the race weekend fills downtown hotels quickly. Greektown, Corktown, and Midtown offer good restaurant options for pre-race meals.
Detroit Metro Airport (DTW) is approximately 20 miles from downtown. Rideshare or hotel shuttle is the easiest transfer. If staying in Windsor, note that you'll need to cross the border both before and after the race — give yourself extra time for customs.
