The Cascais marathon: three laps along the ocean that look flat but aren't

The course: three coastal laps

The marathon runs over 3 laps along the coastal road from Cascais towards Guincho and Cabo Raso, returning through town. Official elevation gain is 216 m over 42.2 km. On paper that doesn't sound like much. In practice it is: constant false flats, never a truly flat kilometer, never a climb where you can clearly change gear. It's the kind of profile that never gives you a stable reference for your pace.

The decisive extra: the stretches towards Guincho are exposed to the ocean. On windy days, several race reports describe it as a demanding run leg, much tougher than the numbers suggest. With a headwind on the way out and a tailwind on the way back (or vice versa), every lap becomes an alternation of completely different perceived effort at the same pace.

Pacing: by effort, not by pace

On this course your GPS lies to you twice: because of the false flats and because of the wind. The right plan is based on perceived effort or heart rate, with pace as a check, not a rigid target.

The three-lap format helps: the first lap is a recon at controlled pace, the second is the management lap, the third is where you spend whatever's left. If you come off the bike with fresh legs, the time to find out is the first lap, not the first kilometer.

A practical trick: mentally split each lap into two blocks, the outbound stretch to Guincho and the return into town. Six blocks total. Give each one a job: eat, drink, check your form, recover in the tailwind section. The marathon stops being a 42 km wall and becomes a sequence of 7 km segments.

Aid stations and support

According to athlete reports, the aid stations offer the classic lineup: porta-potties, cola and bananas. The sources consulted give no official details on the exact distance between aid stations or the full product list: check the current year's athlete guide and, as always, don't try anything new on race day.

The three-lap format is a gift for anyone coming to cheer: position your supporters in Cascais and you'll see them three times, plus the finish. Agree on exact spots in advance and what they should watch for (pace, form, your face): an outside reference every 14 km is gold in the final hours.

The weather: mild, but not trivial

In late October, typical temperatures range from 18 to 25 °C. It's not a hot marathon in the classic sense, but the run start for many age-groupers falls in the middle of the afternoon, with sun and glare off the ocean. The real variable is still the wind: on windy days the exposed sections also demand postural management—run compact and don't fight the gusts.

What to do now

• Build long runs on rolling courses with pace changes into your training: false flats are trained, not improvised.
• Do at least one long run in strong wind, learning to run relaxed into a headwind instead of tensing up.
• Prepare an effort-based pacing plan with three scenarios: calm day, moderate wind, strong wind.
• Test cola and bananas in training if you plan to use the aid stations, or bring your own proven nutrition plan.
• Write out the six-block plan (3 outbound, 3 return) with one job for each, and share it with whoever's coming to cheer.