When is the 2027 Thonon Triathlon?

The 2027 date is not announced yet: the organisers only say see you in 2027. The 2026 edition took place on Sunday 28 June, the 2025 one on Sunday 15 June.

How do you enter the Thonon Triathlon?

Online only, through the link on the official site: there are no race-day entries. Without an FFTri licence you need a competition pass and a health questionnaire. The 2027 opening is not announced yet.

Is the Olympic-distance bike leg 40 km?

No: 36 km in one loop through the Chablais, with 650 m of climbing, according to the 2026 rules. You must pass Orcier church, around km 15, by noon and finish the bike by 1 pm.

Triathlon de Thonon: how many weeks of preparation?

For an athlete at intermediate level, Endu builds a 15-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 5 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.

Triathlon de Thonon 2027: date, course and training plan

47.5 km · swim 1.5 · bike 36 · run 10Thonon-les-Bains2027 edition: date not announced yet

The Thonon Triathlon, organised by Léman Triathlon Club, takes place in June at Port de Rives, in Thonon-les-Bains, with a swim in Lake Geneva. Its Olympic distance has a shorter bike leg than usual, 36 km instead of 40, but it climbs into the Chablais hills: 650 m of climbing, on roads that stay open to traffic. A sprint (S) distance and relays are raced on the same Sunday.

Your plan for Triathlon de Thonon

A plan set to your level and free days, which adapts to your feedback after each session.

Your level?

14-day trial, cancel anytime.

Triathlon de Thonon at a glance

Date: 2027 edition: date not announced yet2026 edition: 28 June 2026
Formats: Distance olympiquePlan below — 1.5 km swim in Lake Geneva (1 loop, in-water start), 36 km bike in the Chablais (1 loop, 650 m of climbing), 10 km run (2 loops). In 2026: 9:45 am start (9:30 am for para-triathletes), out of the water by 10:45 am, past Orcier church (around km 15) by noon, off the bike by 1 pm. Open from the junior category (ages 18-19).
Distance S — 750 m swim, 20 km bike (300 m of climbing), 5 km run on road, cycle path and trail, mostly away from cars. In 2026: 8:30 am start, out of the water by 9:15 am. Open from the cadet category (ages 16-17).
Relais — Both distances can also be raced as a relay, by two or three team-mates sharing the three disciplines.
Registration: The organisers say see you in 2027 but have not published the date or the registration opening yet. In 2026, registration was online only, through the link on the official site, with no race-day entries, and the price rose as the race got closer. FFTri licence or foreign licence; otherwise a competition pass taken out when registering, with a health questionnaire instead of a medical certificate. Refunds until 21 June 2026 with a medical certificate only (€10 kept), none after that.
Official website: thonon-triathlon.fr

The 2026 course

The swim is one 1.5 km loop in Lake Geneva, with an in-water start. The bike is one 36 km loop with 650 m of climbing in the Chablais, on roads open to traffic, with a checkpoint at Orcier church around km 15. The run is 10 km in two loops. Bibs are collected at Port de Rives.

What the race asks of your training

A proper climb in the Chablais

650 m of climbing over 36 km: the bike leaves the lakeshore and climbs into the hills. Hill sessions on the bike, seated then standing, and one weekly ride on hilly roads prepare you better than flat volume. The sample plan below is for a flat Olympic distance: remember to add these climbs.

Roads open to traffic

Traffic is not stopped on the bike course. Marshals show the way but do not hold cars at stop signs or traffic lights, and crossing a solid white line earns a red card. Riding on open roads in training, staying alert on descents and at junctions, is part of the build-up.

No drafting

Drafting is banned on every race; on the Olympic distance, a blue card costs 2 minutes in the penalty box. Threshold sessions, alone with no wheel to follow, match the race effort exactly.

Swimming in Lake Geneva

An in-water start, and in 2026 you had to be out of the water within an hour of the start. A wetsuit is mandatory below 16 °C and banned above 24.5 °C. A few lake sessions, with starts treading water and regular sighting, prepare you better than the pool alone.

The plan below prepares the Distance olympique format, for an athlete at intermediate level with 5 days available per week. Until the official date is out, the example is set for June 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: 15
sessions: 74
sessions / week: 5
peak week: 7 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 3–6 · 4 wk
Build
Weeks 7–9 · 3 wk
Specific
Weeks 10–12 · 3 wk
Taper
Weeks 13–14 · 2 wk
Race week
Weeks 15–15 · 1 wk

Volume progression

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

Wk	Phase	Hours	km
1	General preparation	4.4 h	17
2	General preparation	4.7 h	18
3	Base	5.3 h	12
4	Base	5.5 h	13
5	Baserecovery	4 h	10
6	Base	5.7 h	13
7	Build	6 h	14
8	Build	6.1 h	15
9	Buildrecovery	4.2 h	11
10	Specific	6.4 h	15
11	Specific	6.8 h	16
12	Specific	7 h	17
13	Taper	5.1 h	18
14	Taper	4.1 h	16
15	Race week	2.4 h	7

Sample week — week 8 (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.

MondaySwimmingEasy
39 min continuous swim
39 min · 1.8 km
TuesdayBrickHard
1 h 05 bike + 45 min run
including 3 × 10 min at threshold on the bike · run at threshold
1 h 58
FridaySwimmingHard
3 × 300 m at threshold
40 s recovery
37 min · 1.7 km
SaturdayCyclingEasy
1 h 44 at endurance pace
1 h 44
SundayRunningEasy
Long run 1 h 09
1 h 09 · 11.1 km

Example generated for a intermediate-level profile (MAS 15 km/h, 5 days available per week). Your plan will depend on your level, availability and feedback.

This plan’s check-up

Pass

A 15-week build (recommended minimum: 8); a longest run never more than 8% above the previous month’s; 83% of the time at easy effort; a taper cutting volume by 66% in race week.

3 worth knowing · 19 checks passed

Remarks

Demanding sessions — Up to 4 demanding sessions in a single week (1 week(s)).
Strength training — No strength session.
Fueling — Long sessions (up to 128 min in this plan) are where race fueling is rehearsed.

The 19 checks passed, in detail

Length of the build — 15 weeks: enough for this race (recommended minimum: 8).
Sessions per week — 5 sessions a week: the minimum for this race is met.
Volume progression — Running volume rises smoothly from week to week.
Long run increase — Each week, the longest run is at most 8% longer than the longest of the previous month (benchmark: 10%).
Lighter weeks — A lighter week comes back regularly (weeks 5, 9, 13).
Intensity distribution — About 83% of the time at easy effort: the most common distribution among trained endurance athletes.
Hard days back to back — Demanding sessions are separated by easy days.
Rest days — At least one rest day a week.
Bike-run bricks — 10 bike-run bricks over the last 12 weeks.
Taper — Volume drops 66% 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 (90%).
Swim / bike / run balance — Swim 21%, bike 46%, run 32%: within coaches’ benchmarks.
Frequency per discipline — Each discipline comes back at least 2 times a week.
Open water — 3 open-water session(s) before the race.
Longest ride — The longest ride lasts 120 min (benchmark: 90 to 150 min).
Longest run — The longest run lasts 80 min (benchmark: 60 to 105 min).
Swim distance — The longest swim covers 187% of the race distance.
Long ride increase — The long ride grows in small steps.

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.

Three disciplines, one load

Swim, bike and run are planned together: brick sessions, key sessions spread out, and a coherent total load week after week.

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

“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
“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
“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
“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

Your plan, not a template athlete's

This plan is generated for an athlete at intermediate level with 5 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 Triathlon de Thonon