Nantes Marathon 2027: 12 weeks to be ready on April 25, workouts on your Garmin
Race day is Sunday, April 25, 2027, with a 9:15 a.m. start at the Machines de l'Île, and training starts on Monday, February 1. In two minutes, Running Workout sets the 12-week plan to race day; then, every week, your AI assistant sends the workouts to your watch.
Last updated: October 27, 2026
Abalone Nantes Marathon
Sun, April 25, 2027
167 days
to race day
- Distance
- 26.2 mi
- Edition
- 45th
- Start
- 9:15 a.m.
- Time limit
- 5 h 45 min
Plan starts: Mon, February 1 (12 weeks)
Train for April 25Free to start · official Garmin connection
Try it now
Ask your assistant
Once your Garmin is connected, paste one of these into Claude or ChatGPT:
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« Build my 12 weeks of training for the Nantes Marathon on April 25, 2027, with 4 sessions a week. »
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« I want to break 4 hours in Nantes: what marathon pace per mile, and what pace for my long runs? »
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« Send Sunday's long run for Nantes to my watch: 1 h 50, with the last 30 minutes at marathon pace. »
Free to start · 4 workouts a month sent to your watch
Your training, timed for April 25
The plan lasts 12 weeks, starting on Mon, February 1. With more time, it can start on January 4 with 4 lead-in weeks.
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Weeks 1–3
Base
Feb 1 → Feb 21
Settle volume, wake threshold up
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Weeks 4–7
Development
Feb 22 → Mar 21
Marathon pace comes in, long runs get longer
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Weeks 8–10
Specific
Mar 22 → Apr 11
Long blocks at marathon pace, 2-hour-plus runs
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Weeks 11–12
Taper
Apr 12 → Apr 25
Two weeks to arrive fresh
From the Machines de l'Île to La Beaujoire
The start is at the Nefs des Machines de l'Île, the finish at the Parc des Expositions de la Beaujoire. The organizers announce a 100% urban course via Place Graslin and Place Royale, the Parc de Procé, the Jardin des Plantes, the Île de Versailles and the banks of the Erdre, with a finale on La Traversante, a 324 m (1,063 ft) floating pontoon on the Erdre.
The detailed route and elevation for the 2027 edition are not published yet: check them on the official site before setting your paces. The cutoff is 5 h 45 min, and the race is capped at 7,000 bibs.
A preparation that overlaps Paris
For April 25: a 12-week plan from Monday, February 1, or 16 weeks from January 4. The Paris Marathon is three weeks earlier, on April 4, 2027: the same preparation season, and a fallback for anyone who didn't get a Paris bib in the ballot.
The AI coach reads your actual sessions every week on Garmin and applies its cold rule in January and February, then releases the adapted paces as soon as spring arrives.
Pacing strategy in Nantes
A point-to-point course, from the Machines de l'Île to La Beaujoire: no second pass to get your bearings, so the watch is your guide. The instruction: first 2 miles at target pace plus 15 seconds per mile, then target pace, without trying to win back on the descents the time lost on the climbs.
- January: volume, long run up to 2 h.
- February-March: marathon-pace blocks, long runs with surges.
- April: taper, last long run three weeks out.
The finale follows the Erdre and crosses La Traversante before the line at La Beaujoire: save something for the last mile.
Frequently asked questions
When is the 2027 Nantes Marathon?
Sunday, April 25, 2027, with a 9:15 a.m. start from the Nefs des Machines de l'Île, for the 45th edition. The April 24–25 weekend also offers a half marathon, a night 10K and a marathon relay.
Is the course flat?
The 2027 profile is not published yet. The organizers announce a 100% urban, point-to-point course, from the Machines de l'Île to La Beaujoire; check the elevation on the official site as soon as it's out.
Nantes or Paris?
Both are prepared over the same season, three weeks apart: Paris on April 4, 2027, Nantes on April 25. In Paris, bibs are won in a ballot; in Nantes, they are sold in price tiers, up to a limit of 7,000 places.
Is Running Workout free?
Free to start: Garmin connection, plans, reading your activities and 4 workouts a month sent to your watch. Running Workout Pro (€4.90 a month or €35 a year, no commitment) removes the limit.
Abalone Nantes Marathon
April 25 is 167 days away.
The plan is set to that date; your assistant does the rest, week after week.