Buenos Aires, AR · September 2026
Maratón Internacional de Buenos Aires
Maratón Internacional de Buenos Aires pacing strategy with per-km splits from your VDOT, adjusted for the typical 10–18 °C climate baseline in Buenos Aires.
- Distance
- 42.20 km
- Elevation gain
- 88 m
- Typical temp
- 10–18 °C
- Cutoff
- 6:00:00
The short version
A fair test with a few teeth
- ▸Most runners crack near km 32 — fuel before km 30, not at it.
- ▸Full overhead sun from km 31 — sunscreen and run the shaded side.
Next edition
27 September 2026
Typical race-day conditions
10–18 °C
We lock the real forecast into your plan in race week.
Course difficulty
ModerateDriven by a flat, fast course with mild conditions. Harder than Medtronic Twin Cities Marathon (4.8), easier than Marathon du Lac d’Annecy (4.9) — tougher than 40% of the races we cover.
Race data quality
Medium confidence
Last verified: source review pending
Course distance, climate, and broad course features are suitable for pacing previews. Elevation profiles and aid-station details are approximate and should be checked against the official race packet before race day.
Elevation profile
Verified profile
Paid strategy guardrail
Official race packet remains source of truth
- Published race organizer materials
- Public course maps and elevation references
- Historical climate normals for the race month
Step 1 · Free preview
See the course-adjusted plan first
Enter one recent result. The preview returns course cost, first splits, and fuel target from the deterministic engine and the current course data model.
VDOT
49.1
Estimate
3:20:21
Course cost
+6:37
Fuel target
90 g/h
First 5 km preview
full race locked
- km 14:48
- km 24:39
- km 34:49
- km 44:42
- km 54:41
First race free · then €7 Race Pass · no monthly subscription
Uses an approximate course model; verify final logistics against the official race packet.
Step 2 · Your full Maratón Internacional de Buenos Aires plan
The preview shows the shape. The plan races it for you.
Course preview
Free
what you see now
- ✓Difficulty score & course data
- ✓Course-cost & toughest km
- ✓Your first full plan free, ever
Race Pass
€7
one-time, this race
- ✓Every km split, weather-adjusted
- ✓Nutrition & fluid timeline
- ✓Heat, wind & sun race tactics
- ✓Danger zones + watch file (GPX)
- ✓Race-week forecast & reminders
Annual
€19
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- ✓Re-plan as your fitness changes
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Continue with approximate course data →Course elevation
88 m total gain · 96 m loss · max 52 m, min -5 m.
Fly the course
Sun & shade
Sun in your eyes
6 km
Sun on your back
6 km
Side / overhead
31 km
From km 31 the sun sits high overhead — peak UV and radiant heat, so keep sunscreen on and run the shaded side of the road where you can.
Approximate — solar position from the route geometry and a 07:00:00 start (timezone estimated from longitude), for a mid-pack finishing time.
Aid stations
8 stations on course — plan your fueling around them.
Race overview
Buenos Aires is South America's flagship city marathon and a fast late-winter course. The profile is forgiving, so pacing and carbohydrate execution usually decide the back half.
How hard is this course?
Reference table — how the Maratón Internacional de Buenos Aires compares to a flat sea-level course for four typical fitness levels. Computed from the route profile, mean course altitude, and typical race-week climate (14 °C / 65 % humidity). Your personal strategy uses your VDOT, per-km splits, nutrition timing, and the typical climate baseline for this static sample; paid strategies use Open-Meteo when a verified race date is inside the forecast window.
| Runner | Flat-course finish | Maratón Internacional de Buenos Aires finish | Course cost | Adjusted pace |
|---|---|---|---|---|
| Beginner (VDOT 35) | 4:16:08 | 4:24:53 | +3.4% | 6:07/km |
| Intermediate (VDOT 45) | 3:28:17 | 3:35:24 | +3.4% | 4:59/km |
| Trained (VDOT 50) | 3:10:41 | 3:17:12 | +3.4% | 4:33/km |
| Competitive (VDOT 60) | 2:43:24 | 2:48:58 | +3.4% | 3:54/km |
Reference nutrition
For a 70 kg runner finishing in 3:17:12 at 14 °C. Adjust to your weight and tolerance — these are ISSN-window targets, not prescriptions.
- Carbs / hour
- 90 g
- Total carbs
- 296 g
- Fluid / hour
- 640 ml
- Sodium / hour
- 500 mg
FAQ
How hilly is the Maratón Internacional de Buenos Aires?
65 m of cumulative elevation gain across 42.2 km. Effectively flat — pace evenly and fuel reliably.
What is the typical weather on race day?
10–18 °C with 65 % relative humidity. Heat acclimatization makes a measurable difference when the race-week forecast trends warm.
Get your personalized strategy
The numbers above are samples. Sign up free and get the full Maratón Internacional de Buenos Aires strategy from your VDOT, the current course model, Open-Meteo race-week forecast when available, and your nutrition preferences.
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New to the marathon? Start with our marathon pacing strategy guide or run the VDOT calculator.