When is the 2027 Half du Lac d'Annecy?

On Sunday 20 June 2027, with an 8 am start from Doussard beach, according to the organiser. Bib collection on Saturday 19 June from 4 to 6 pm, or on race morning from 6:30 am.

How do you enter the Half du Lac d'Annecy?

On Finishers, where the organiser sends entrants for 2027; registration is already open. The €105 launch price holds until the 200th entrant, then it rises to €135, then €165.

What are the cut-offs?

Out of the water by 9:10 am, off the bike by 1:30 pm and finish by 3:30 pm: 1 h 10, 5 h 30 and 7 h 30 after the 8 am start.

Half du Lac d'Annecy: how many weeks of preparation?

For an athlete at intermediate level, Endu builds a 21-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 6 sessions per week. You choose 5 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.

Half du Lac d'Annecy 2027: date, course and training plan

108 km · swim 1.9 · bike 85 · run 21.1Doussard2027 edition: 20 June 2027

The Half du Lac d'Annecy starts from Doussard beach, at the far end of the lake, 17 km south of Annecy. Organised by Team Mermillod Triathlon, it links a 1.9 km swim in the lake, 85 km of cycling with 1,030 m of climbing over the Col des Esserieux and the Col du Marais, crossed on the way out and on the way back, then a half marathon in two loops through the countryside overlooking the lake. The 2027 edition will be the 18th.

Your plan for Half du Lac d'Annecy

33 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.

Half du Lac d'Annecy at a glance

Date: 2027 edition: 20 June 2027
Formats: Triathlon LPlan below — The half, solo: 1.9 km swim (one triangle in the lake), 85 km out-and-back bike (1,030 m of climbing), 21.1 km run in two loops (the map on the organiser's site says 19 km). 8 am start. Out of the water by 9:10 am, off the bike by 1:30 pm, finish by 3:30 pm.
Triathlon L en relais — The same course, as a team of two or three.
Registration: 2027 registration is open on Finishers, the ticketing site the organiser links to. 2027 solo prices: €105 up to the 200th entrant, €135 up to the 400th, then €165, plus service fees; relays pay the same amounts per team, in steps of 10 teams. FFTri licence or day licence. Per the rules, entries are not refunded if you withdraw.
Official website: tmt-triathlon.com/half-iron-doussard-2024

The 2027 course

The swim is a 1.9 km triangle in the lake, starting and finishing on Doussard beach. The bike is an 85 km out-and-back: Col des Esserieux (763 m), Col du Marais (833 m), turnaround, then both climbs the other way, with a high point of 844 m. The run is two loops through the countryside south of the lake, via Doussard, Arnand, Chevaline, Marceau-Dessus and Marceau-Dessous, with three aid stations.

What the race asks of your training

Two climbs, twice

The bike course goes over the Col des Esserieux (763 m) then the Col du Marais (833 m), turns around and climbs them again the other way: 1,030 m of climbing over 85 km. Weekend long rides should string together steady climbs while keeping legs for the second half. The sample plan below is for a classic half: remember to add this climbing.

The 1:30 pm cut-off

You must be out of the water by 9:10 am and off the bike by 1:30 pm. If you leave the water at the cut-off, you have 4 h 20 for the transition and the 85 km, about 20 km/h on average with the climbing. Measuring your real speed on a long, hilly ride late in the build-up tells you whether you have a margin.

Few aid stations on the bike

Two aid stations on the bike, three on the run, and any outside help is banned. Practising eating and drinking on the bike for several hours, with what you will carry on race day, avoids running out of energy on the second climb.

Traffic rules apply

The rules require you to follow the highway code: keep right except to overtake. The descents of both climbs, out and back, are worth practising: lines, braking, and staying on the right even at speed.

The plan below prepares the Triathlon L format, for an athlete at intermediate level with 6 days available per week, with race day on 20 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: 21
sessions: 125
sessions / week: 6
peak week: 10.3 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 3–8 · 6 wk
Build
Weeks 9–13 · 5 wk
Specific
Weeks 14–18 · 5 wk
Taper
Weeks 19–20 · 2 wk
Race week
Weeks 21–21 · 1 wk

Volume progression

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

Wk	Phase	Hours	km
1	General preparation	6.3 h	21
2	General preparation	6.6 h	22
3	Baserecovery	5.6 h	19
4	Base	7.2 h	23
5	Base	7.5 h	24
6	Base	7.7 h	25
7	Baserecovery	6.1 h	20
8	Base	8.1 h	25
9	Build	8.5 h	28
10	Build	8.7 h	28
11	Buildrecovery	6.7 h	24
12	Build	9 h	29
13	Build	9.2 h	30
14	Specific	9.5 h	30
15	Specificrecovery	7.2 h	24
16	Specific	9.6 h	30
17	Specific	10 h	32
18	Specific	10.3 h	33
19	Taper	7 h	22
20	Taper	5.7 h	18
21	Race week	3.6 h	8

Sample week — week 12 (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
59 min continuous swim
59 min · 2.7 km
TuesdayRunningVery hard
3 × 1.2 km at MAS
2 min 30 s jog recovery
48 min · 8.8 km
ThursdayBrickHard
1 h 30 bike + 17 min run
including 3 × 10 min at threshold on the bike · run at marathon pace
1 h 55
FridaySwimmingHard
10 × 200 m at threshold
20 s recovery
59 min · 2.8 km
SaturdayCyclingEasy
2 h 45 at endurance pace
2 h 45
SundayRunningEasy
Long run 1 h 33
1 h 33 · 15 km

Example generated for a intermediate-level profile (MAS 15 km/h, 6 days available per week). Your plan will depend on your level, availability and feedback.

This plan’s check-up

Pass

A 21-week build (recommended minimum: 12); a longest run never more than 6% above the previous month’s; volume rising at most 13% from one week to the next; 82% of the time at easy effort; the longest session 3 weeks before the race; a taper cutting volume by 65% in race week.

2 worth knowing · 22 checks passed

Remarks

Strength training — No strength session.
Fueling — Long sessions (up to 195 min in this plan) are where race fueling is rehearsed.

The 22 checks passed, in detail

Length of the build — 21 weeks: enough for this race (recommended minimum: 12).
Sessions per week — 6 sessions a week: the minimum for this race is met.
Volume progression — Running volume rises at most 13% from one week to the next (a signal appears beyond 20%).
Long run increase — Each week, the longest run is at most 6% longer than the longest of the previous month (benchmark: 10%).
Lighter weeks — A lighter week comes back regularly (weeks 3, 7, 11, 15, 19).
Intensity distribution — About 82% of the time at easy effort: the most common distribution among trained endurance athletes.
Demanding sessions — No more than 3 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.
Timing of the longest session — The longest session falls 3 weeks before the race: the right time.
Bike-run bricks — 10 bike-run bricks over the last 12 weeks.
Taper — Volume drops 65% 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 (92%).
Swim / bike / run balance — Swim 22%, bike 48%, run 30%: within coaches’ benchmarks.
Frequency per discipline — Each discipline comes back at least 2 times a week.
Sessions per week — 6 sessions a week: enough for a long format.
Open water — 5 open-water session(s) before the race.
Longest ride — The longest ride lasts 195 min (benchmark: 180 to 270 min).
Longest run — The longest run lasts 110 min (benchmark: 90 to 135 min).
Swim distance — The longest swim covers 174% 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 6 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 Half du Lac d'Annecy