Race IntelligenceCambridge, Maryland, United States
Know your day before you race it.
Enter four numbers you already train with. You get a likely finish range, target paces and watts, and how I would race this course.
Published route evidence. Final 2026 route pending. Checked 17 Sept 2026.
01 Race Card
Your first range uses conservative assumptions. Add optional evidence to make it more specific. It is calculated in your browser and saved only on this device.
02 The course
You swim two loops in the brackish, tidal Choptank River, ride two flat laps through rural Dorchester County and the Blackwater National Wildlife Refuge, then run three flat laps along the river and through downtown Cambridge. The organiser calls the bike course flatter than flat, and that is the whole problem. Nothing on this course forces you to slow down, so the discipline has to come from you.
Swim
3.8 km
Two loops in a brackish tidal river, where the 2026 race runs on an outgoing tide, so you swim against a slight current outbound and with it coming back.
Source: 2026 current routeBike
180.2 km
Two laps of flat, non-technical wetland roads with very little elevation change, which leaves wind exposure and your own pacing discipline as the things that decide the split.
Source: 2026 current routeRun
42.2 km
Three flat laps along the river and through downtown Cambridge, where the lack of terrain means the marathon is decided by what the bike left behind.
Source: 2026 current routeThese facts come from the organiser’s latest published material: swim, 2026 current route; bike, 2026 current route; run, 2026 current route. They describe the character of the course. They do not confirm the final 2026 route.
03 Race plan
One job for each part of this course. The distance markers tell you when the job changes. The course tells you why.
Swim
The 2026 swim runs on an outgoing tide, so the outbound leg is against a slight current. It will feel slower than your pool pace suggests. That is the course, not your fitness, so hold effort rather than chasing the clock.
The inbound leg runs with the current. Let it give you the time back rather than pressing harder because the water suddenly feels easier.
Bike
The course leaves Cambridge for open wetland roads with almost no elevation change. With no hills to check you, it is easy to settle 15 watts too high without noticing. Pick your ceiling in the first half hour and treat it as fixed.
The Blackwater National Wildlife Refuge is open marshland with very little to block the wind. A headwind section costs more here than the same wind would on a sheltered course, and the return leg gives it back.
The second lap repeats the same flat roads. This is the point where a bike that felt easy starts to show up, and where riding to the same ceiling protects the marathon. The course is not fully closed, so keep paying attention to traffic.
Run
The run is flat from start to finish, which removes every natural excuse to slow down. Start slower than feels right. A flat marathon punishes an early mistake for longer than a hilly one does.
Running the same riverside and downtown streets a second time gives you a clean read on whether the bike was paced correctly. Compare this lap to the first one honestly and adjust now rather than at 35 km.
The last lap finishes along the historic Long Wharf on the Choptank. If you held your bike ceiling on both laps, this is where that discipline pays. If you did not, this is where a flat course stops helping.
04 Race week
There is no useful 2026 forecast this far out. For now, past race dates give us a point of reference. Closer to the race, the forecast will tell us whether the plan needs changing.
A race-day forecast is not meaningful yet; check back closer to the event.
Historical baseline, 2019–2025 · Open-Meteo historical archive · Updated 2026-09-17.Historical comparison only. This is not a forecast for 2026.
05 Method
Your CSS, FTP, weight and run threshold create the first range. Open-water, bike, run and execution evidence can replace broad assumptions. Course data and the historical conditions baseline shape every simulation.
Confidence is built from four inputs
It starts with the targets in your Race Card, then samples the parts of a full distance that vary: open-water pace, transitions, bike speed at the planned power, and the drop in run performance after the swim and bike. Repeating that calculation produces a likely range rather than a single heroic number.
The current time calculation uses this race’s published distances, or standard full distance distances where none are published, with the available course headings, elevation and exposure evidence. Weather scenarios vary temperature, dew point, wind, gusts, rain and water conditions together. Unknown route detail stays visible as uncertainty rather than false precision.
It is not predicting your exact finishing time, placing, or race-day weather. It answers a narrower question: given the plan and the information we have, what range of day is plausible, and where is the uncertainty coming from?
Confidence is not a permanent “low”. It is recalculated across four separate inputs:
It starts low when those inputs are broad. It can become moderate or high as the evidence improves. A narrower range means better information, not a guarantee.
Evidence
Course status: Partially verified. The organiser’s descriptions and latest published route profiles are in use. The final 2026 route is not yet confirmed. Last checked 2026-09-17.