When is the 2027 Île d’Oléron Ultra-Trail?

On Saturday 3 April 2027, with a 5:30 am start from the citadel of Le Château-d’Oléron. Bib collection is the day before, Friday 2 April from 10 am to 9:30 pm, and the prize-giving on Sunday 4 April at 10 am.

What are the cut-offs?

According to the 2027 rules: Domino (km 50) before 2 pm, Gautrelle beach (km 75) before 6 pm and Le Golf (km 87) before 8:15 pm.

Are there still places left?

As of 10 October 2026, the Klikego platform only shows the bib exchange for the 100 km, the pairs race and the relay of four: bib transfers go through it, until 20 March 2027 at 8 pm. The walk is still open, including on the day.

Ultra Trail Île d'Oléron: how many weeks of preparation?

For an athlete at intermediate level, Endu builds a 25-week preparation. If your race is closer, the plan compresses phases while keeping the taper; if it's further away, it lengthens the preparation, and when the gap is large the preparation starts right away, gently and at your current volume, before building up.

How many sessions per week?

This example has 4 sessions per week. You choose 4 to 7 training days and the exact days (e.g. Tue, Thu, Sat, Sun): the plan sticks to them.

I'm a beginner, is this plan for me?

The plan adapts to your declared level (beginner to semi-pro): starting volume, progression and intensity change. Endu also offers a "Discovery" mode without a race to build a base first.

Can I follow sessions on my watch?

Yes, on Garmin and COROS. On Garmin, the Endu app (Connect IQ Store) shows today’s session and starts it as a guided workout. On COROS, link your account from your profile: your running, trail and cycling sessions land in the watch calendar. Other brands are not supported yet.

How much does it cost?

14-day free trial, then €7.99/month with no commitment or €59.88/year (€4.99/month). Unlimited objectives and sports.

Ultra Trail Île d'Oléron 2027: date, course and training plan

100 km · 790 m D+Le Château-d'Oléron2027 edition: 3 April 2027

The Île d’Oléron Ultra-Trail runs all the way round the island in 100 km, starting and finishing at the citadel of Le Château-d’Oléron, through forests, salt marshes, beaches and oyster-farming country. Organised by the island’s inter-municipal sports office, it is raced solo, as a pair (2 × 50 km) or as a relay of four (4 × 25 km), all on the same course. The 4th edition takes place on Saturday 3 April 2027.

Your plan for Ultra Trail Île d'Oléron

21 weeks to go: your plan starts this week, set to your level and free days, then adapts to your feedback after each session.

Your level?

14-day trial, cancel anytime.

Ultra Trail Île d'Oléron at a glance

Date: 2027 edition: 3 April 2027
Formats: 100 km soloPlan below — About 100 km and 791 m of climbing according to the 2027 rules (IGN data). 5:30 am start from the citadel of Le Château-d’Oléron. 1,350 bibs in 2027, minimum age 20.
Duo 2 × 50 km — The same course as a relay of two, with the handover at the Domino market, halfway; the two runners do not race at the same time. 350 pairs in 2027, minimum age 20.
Relais 4 × 25 km — The same course in a team of four, with handovers at Le Grand-Village-Plage, Domino and Gautrelle beach. 450 teams in 2027, minimum age 18.
Marche et course enfants — A walk of about 10 km from the citadel (9:30 am) and a children’s race (11 am), on the same day.
Registration: On the Klikego platform, from 29 August 2026 at 8 am until 20 March 2027 at 8 pm while places last. 2027 prices for the 100 km: €101 until 30 November 2026, €106 until 31 January 2027, €111 after that, plus €11 for the mandatory GPS tracker hire. French Athletics Federation licence, PPS health course under three months old, or a medical certificate. As of 10 October 2026, Klikego only offers the bib exchange for the three running formats, which the rules reserve for when entries are full. No bib collection on race day.
Official website: ut-oleron.fr

The 2026 course

Start at the citadel of Le Château-d’Oléron heading south towards Saint-Trojan-les-Bains, then a full lap of the island along the coastal path: aid station at the eco-farmhouse museum in Le Grand-Village-Plage (km 25), a run across the roof of the La Cotinière fish market, the main base at Domino market (km 48), where you can pick up your bag, the Chassiron lighthouse, the Gautrelle beach aid station (km 75), a view of Fort Boyard, then back to the citadel. The organisers note that the 2026 route changed slightly from 2025.

What the race asks of your training

Little climbing, a lot of running

Under 800 m of climbing over 100 km: nearly all of it is runnable, without the walking breaks that mountain climbs force on you. Muscle fatigue and steady pacing decide the race. The plan relies on easy aerobic running, long runs run from start to finish and steady-pace work, rather than hill sessions.

Sand is the real difficulty

The organisers say so themselves: the main difficulty is not the climbing but the sandy sections. The course is about 82% tracks and sand and 18% road. A few runs on soft sand and forest tracks, plus ankle and calf strengthening, prepare you for that unstable footing.

Night start and cut-offs

5:30 am start, by headtorch. 2027 cut-offs: Domino (km 50) before 2 pm, La Gautrelle (km 75) before 6 pm, Le Golf (km 87) before 8:15 pm. That means covering 50 km in about 8½ hours, at an easy pace but without dawdling.

Regular aid stations

Full aid stations at km 25 (Grand-Village), 50 (Domino) and 75 (La Gautrelle), and drinks points at km 12, 37, 62 and 87. You run with your own reusable cup and a mandatory water and food reserve. Test your drink and food on long runs, and get used to drinking on the move.

The plan below prepares the 100 km solo format, for an athlete at intermediate level with 4 days available per week, with race day on 3 April 2027. Aiming for another format? Enter its distance when you create your plan, which will be calibrated on your level, your available days and your feedback after every session.

weeks: 25
sessions: 100
sessions / week: 4
peak week: 10.9 h

Plan structure

Periodised in phases: build the base, move to race-specific work, then taper before the race.

General preparation
Weeks 1–2 · 2 wk
Base
Weeks 3–10 · 8 wk
Build
Weeks 11–16 · 6 wk
Specific
Weeks 17–22 · 6 wk
Taper
Weeks 23–24 · 2 wk
Race week
Weeks 25–25 · 1 wk

Volume progression

Week by week: lighter recovery weeks are built in to absorb the load.

Wk	Phase	Hours	km	Elev.
1	General preparation	6.4 h	46	250 m
2	General preparation	6.6 h	48	321 m
3	Baserecovery	5.1 h	37	176 m
4	Base	6.6 h	47	313 m
5	Base	7 h	51	330 m
6	Base	7.3 h	52	351 m
7	Baserecovery	5.7 h	41	220 m
8	Base	7.3 h	52	387 m
9	Base	7.8 h	56	405 m
10	Base	8.1 h	58	423 m
11	Buildrecovery	6.3 h	45	242 m
12	Build	8.6 h	58	409 m
13	Build	8.9 h	61	434 m
14	Build	9.1 h	62	457 m
15	Buildrecovery	7 h	50	304 m
16	Build	9.3 h	64	504 m
17	Specific	9.7 h	66	504 m
18	Specific	9.9 h	66	594 m
19	Specificrecovery	7.7 h	55	318 m
20	Specific	10.2 h	69	558 m
21	Specific	10.6 h	71	658 m
22	Specific	10.9 h	75	595 m
23	Taper	6.9 h	49	302 m
24	Taper	5.4 h	39	102 m
25	Race week	3.6 h	30	17 m

Sample week — week 14 (Build)

Real sessions from the plan with their targets. Each session is detailed step by step, and can be sent to a Garmin or COROS watch.

TuesdayVery hard
14 × 1 min 30 s uphill
recover on the way down, 2 min 15 s
1 h 18 · 10.4 km
FridayEasy
40 min easy
40 min · 5.3 km
SaturdayEasy
Back-to-back long run
2 h 04 · 13 km
SundayEasy
Long run 5 h 03
5 h 03 · 33 km

Example generated for a intermediate-level profile (MAS 15 km/h, 4 days available per week). Your plan will depend on your level, availability and feedback.

This plan’s check-up

Pass

A 25-week build (recommended minimum: 20); a longest run never more than 10% above the previous month’s; volume rising at most 7% from one week to the next; 96% of the time at easy effort; the longest session 3 weeks before the race; a taper cutting volume by 67% in race week.

2 worth knowing · 16 checks passed

Remarks

Strength training — No strength session.
Fueling — Long sessions (up to 360 min in this plan) are where race fueling is rehearsed.

The 16 checks passed, in detail

Length of the build — 25 weeks: enough for this race (recommended minimum: 20).
Sessions per week — 4 sessions a week: the minimum for this race is met.
Volume progression — Running volume rises at most 7% from one week to the next (a signal appears beyond 20%).
Long run increase — Each week, the longest run is at most 10% longer than the longest of the previous month (benchmark: 10%).
Lighter weeks — A lighter week comes back regularly (weeks 3, 7, 11, 15, 19, 23).
Intensity distribution — About 96% of the time at easy effort: the most common distribution among trained endurance athletes.
Demanding sessions — No more than 2 demanding session(s) a week: suited to the level.
Hard days back to back — Demanding sessions are separated by easy days.
Rest days — At least one rest day a week.
Climbing in training — The plan prepares the climbs and descents (32 sessions with elevation).
Timing of the longest session — The longest session falls 3 weeks before the race: the right time.
Taper — Volume drops 67% in race week.
Intensity during the taper — Short race-pace efforts remain in the last two weeks.
Frequency during the taper — The number of sessions stays close to usual (100%).
Climbing in the busiest week — The busiest week climbs 658 m, for 790 m on race day.
Back-to-back long runs — The plan has back-to-back long runs (9 weekends).

Endu runs its own plans through the plan check open to everyone: same public rules, same thresholds, same sources. The rules and their sources, and a check of your own plan.

Why this plan works

Science-based periodisation

Base → build → specific → taper, with a recovery week every 3 to 4 weeks. Load goes up, but never two hard weeks in a row without a breather.

Paces, not vague feelings

Every session has target zones (pace, HR) computed from your MAS or a reference performance. A MAS test is built into the plan if you don't know yours.

Elevation as the central variable

Weekly climbing volume, long hilly runs, downhill technique and power-hiking for ultras: a trail plan is not a road plan with bumps.

A plan that listens

After each session you rate how it felt (RPE). Too hard? The plan eases what follows. Skipped a session? It reschedules or absorbs it.

On your watch

On Garmin with the Endu app, on COROS by direct sync: the guided workout shows up on your wrist, step by step.

Reviews

What our users say.

4.8/5

“I took Endu to prepare a trail race with friends. I really like having my week already organised: it motivates me and I enjoy my runs more.”
Émilie · Trail
“What I like is no longer asking myself a thousand questions before going for a run. I follow the plan and I enjoy training.”
Nicolas · Trail
“With work and the kids, I thought I’d struggle to follow a plan. In the end, having a structure helps me a lot. Running has found a real place in my week again, and it feels good!”
Julie · Trail
“I used to spend more time looking for a plan than following one. Now I have my sessions, I know what to do and I stick to it. Really glad I tried it.”
Thomas · Running
“Training for my first half marathon and honestly, I’m getting into it! I even look at my next sessions ahead of time, when before I was mostly looking for an excuse not to go out 😂”
Camille · Running
“Simple to follow and really handy with the watch. I start my session and off I go.”
Julien · Running
“A good find to prepare my swimrun! It’s nice to find a plan for this sport. I’ve recommended it to my teammate.”
Antoine · Swimrun
“I run more regularly and, above all, with more desire. For that alone, I’m delighted.”
Laura · Swimrun
“For triathlon, having all three sports in the same schedule really makes my life easier. I spend less time organising my training and I still enjoy following it just as much.”
Maxime · Triathlon
“At first I just wanted to try it. Now checking the next day’s session has become my little evening ritual 😊”
Sarah · Triathlon

Your plan, not a template athlete's

This plan is generated for an athlete at intermediate level with 4 days available per week. Yours will be calibrated on your MAS, your available days and your feedback after every session. 3 minutes. 14-day trial, cancel anytime.

Create my plan for Ultra Trail Île d'Oléron