When is the 2026 Boulogne-Billancourt Half Marathon?

On Sunday 15 November 2026, for the 29th edition, starting at 10 am.

Where and when does the Boulogne half start?

At 10 am for all pens, at 117 Avenue Victor-Hugo. Bag drop is on Boulevard Jean-Jaurès: drop-off from 8 am, collection before 2 pm, bags of 20 litres at most.

Where do I collect my Boulogne half bib?

At the Gymnase de la Biodiversité, 44 Rue Marcel-Bontemps: Friday 13 November, 11:30 am to 7 pm, and Saturday 14 November, 10 am to 6 pm (the rules give slightly different hours: 12 noon to 7 pm and 10 am to 7 pm). Bring ID and the collection card sent by email; someone else can collect the bib with these documents. No bib is handed out on 15 November.

What is the time limit?

3 hours, a little over 8:30 per km.

Can I still enter the 2026 Boulogne half?

No, the race is sold out. The official runner-to-runner resale platform remains, in case a bib becomes free.

Semi-Marathon de Boulogne-Billancourt: how many weeks of preparation?

For an athlete at intermediate level, Endu builds a 13-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 3 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.

Semi-Marathon de Boulogne-Billancourt 2026: date, course and training plan

21.1 km · 124 m D+Boulogne-Billancourt2026 edition: 15 November 2026

The Christian-Granger Boulogne-Billancourt Half Marathon, organised by the Athletic Club de Boulogne-Billancourt, celebrates its 29th edition on Sunday 15 November 2026. The course links the banks of the Seine and the Bois de Boulogne, with 124 m of climbing, and brings together an elite field and thousands of amateur runners. 13,000 runners are expected; the race is sold out.

Your plan for Semi-Marathon de Boulogne-Billancourt

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

Your goal time?

14-day trial, cancel anytime.

Semi-Marathon de Boulogne-Billancourt at a glance

Date: 2026 edition: 15 November 2026
Formats: Semi-marathonPlan below — 21.1 km, 124 m of climbing. 10 am start for all pens, at 117 Avenue Victor-Hugo. Time limit: 3 hours. Aid stations every 5 km and at the finish, with tap water and no plastic bottles: bring a flask or bottle to fill. 13,000 places, €45 to €60 depending on when you registered. You must turn 18 during the year.
Registration: Sold out for 2026. The official runner-to-runner resale platform, linked from the website, remains if a bib becomes free; a registered runner can also transfer their bib free of charge from their personal account. An FFA licence or a PPS health pass is required. Elite (under 1h08), expert (under 1h15) and preferential (under 1h25) bibs require a half-marathon time from the last two years. Nothing is announced for 2027 yet; the website newsletter gives notice when registration opens.
Official website: semi-marathonbb.fr/semi-marathon

The 2026 course

Start at 117 Avenue Victor-Hugo. The course heads east along Boulevard de la République and through Point-du-Jour (km 1), reaches the Seine at Quai du Point-du-Jour (km 2) and runs alongside the Île Seguin on Quai Georges-Gorse (km 3). It crosses the Trapèze district (km 4), passes Rue Gallieni (km 5), then follows Quai Alphonse-Le-Gallo and Quai du 4-Septembre (km 6 to 8) before entering the Bois de Boulogne around km 9: near Longchamp (km 10), the Pré-Catelan (km 12), Allée de la Reine-Marguerite (km 13) and near the Auteuil racecourse (km 14). Back into Boulogne along Boulevard Anatole-France (km 16 and 17), the quays (km 18 and 19) and the Rhin-et-Danube roundabout (km 20), and the finish on Avenue André-Morizet, near the town hall.

What the race asks of your training

A build-up from late summer

To race on 15 November, a 12-week build-up starts in late August. The threshold and half-marathon-pace sessions fall in September and October, when it is cooler: that is when consistency pays off.

Fast, but not quite flat

124 m of climbing over 21.1 km: the Seine quays are flat, the Bois de Boulogne rolls a little between km 9 and km 16. A few short hills in your easy runs and half-marathon-pace reps on routes with turns prepare you better than the track alone.

13,000 runners at the same start

Everyone starts at 10 am, split into 11 pens by target time. Pacers run from 1h30 to 2h05; following one means knowing your pace: 4:16 per km for 1h30, 4:59 for 1h45, 5:41 for 2 hours.

Your own flask at the aid stations

The aid stations serve city tap water, with no bottles: the organisers advise bringing a flask or a bottle. Running your last sessions with it avoids losing time, or going without, on race day.

The plan below prepares the Semi-marathon format, for an athlete at intermediate level with 4 days available per week, with race day on 15 November 2026. 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: 13
sessions: 52
sessions / week: 4
peak week: 4.9 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 3–5 · 3 wk
Build
Weeks 6–7 · 2 wk
Specific
Weeks 8–10 · 3 wk
Taper
Weeks 11–12 · 2 wk
Race week
Weeks 13–13 · 1 wk

Volume progression

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

Wk	Phase	Hours	km
1	General preparation	2.8 h	28
2	General preparation	3 h	30
3	Baserecovery	2.4 h	23
4	Base	3.3 h	33
5	Base	3.6 h	36
6	Build	3.8 h	40
7	Buildrecovery	3 h	30
8	Specific	4.2 h	42
9	Specific	4.5 h	45
10	Specific	4.9 h	49
11	Taper	3.5 h	34
12	Taper	2.7 h	26
13	Race week	2.3 h	22

Sample week — week 8 (Specific)

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.

MondayEasy
51 min easy
51 min · 8.2 km
TuesdayVery hard
6 × 800 m at MAS
2 min jog recovery
57 min · 10.8 km
WednesdayEasy
51 min easy
51 min · 8.2 km
SundayModerate
Long run 1 h 31
last 11 min at marathon pace
1 h 31 · 15.1 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 13-week build (recommended minimum: 8); a longest run never more than 10% above the previous month’s; volume rising at most 11% from one week to the next; 90% of the time at easy effort; the longest session 3 weeks before the race; a taper cutting volume by 53% in race week.

2 worth knowing · 16 checks passed

Remarks

Strength training — No strength session.
Fueling — Long sessions (up to 105 min in this plan) are where race fueling is rehearsed.

The 16 checks passed, in detail

Length of the build — 13 weeks: enough for this race (recommended minimum: 8).
Sessions per week — 4 sessions a week: the minimum for this race is met.
Volume progression — Running volume rises at most 11% 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).
Weight of the long run — The long run keeps a reasonable share of the week.
Intensity distribution — About 90% 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.
Easy run pace — Easy runs are truly easy (slower than 5:43/km).
Race-specific work — 7 race-specific sessions in the last block.
Timing of the longest session — The longest session falls 3 weeks before the race: the right time.
Taper — Volume drops 53% 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%).

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.

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 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
“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 Semi-Marathon de Boulogne-Billancourt