2027 Bonn Marathon - Apr 11 Countdown

Q: How do I register for the Bonn Marathon 2027?

Registration is first-come, first-served with no lottery, opening after the summer holidays in 2026 on the official site deutschepostmarathonbonn.de. The early-bird entry is EUR 74 (until Oct 31), rising in stages to roughly EUR 93 for late entries. Sign up early: the companion half marathon sells out months ahead.

Q: What is the Bonn Marathon course like?

It is a two-loop, traffic-free course along the river Rhine through the federal city. The half marathon covers the loop once; the marathon covers it twice. The finish is in the heart of the old town at the Altes Rathaus (Old Town Hall) on the Marktplatz, where crowds greet every finisher.

Q: Does the Bonn Marathon count as a Boston qualifier?

Yes. The course is DLV and WA/AIMS certified (officially "best-list eligible"), so a qualifying time run here is accepted for Boston Marathon registration. Note the flat profile and cool spring weather make it well suited to chasing a BQ.

Q: What is the time limit for the Bonn Marathon?

The cut-off is 6 hours. With the marathon starting at 11:00, the course closes around 17:00. This is a comfortable limit for first-timers, but check the official start-corral and aid-station closing times before race day.

Q: How big is the Bonn Marathon field?

The full marathon is a mid-size race of roughly 1,300 to 1,500 finishers (about 1,336 in 2025). The widely quoted figure of 22,222 is the all-events record across the marathon, half marathon, relay and shorter races combined, not the 42.195 km field. The half marathon alone holds 12,500 slots.

Q: What should I wear and expect from the weather in Bonn in April?

Expect a mild spring morning around 10&deg;C (50&deg;F) at the 11:00 start, warming toward 15&deg;C (59&deg;F) by midday, with about a 27% chance of rain. Dress in shorts and a long-sleeve top you can remove, and keep a disposable layer for the corral.

Q: Where is the nearest airport to Bonn?

Cologne/Bonn Airport (CGN) is about 25 km away, with Dusseldorf (DUS) around 75 km and Frankfurt (FRA) about 150 km via a direct ICE train. The official site and entry forms are available in English, making it straightforward for international runners.

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Race Information

Race	2027 Bonn Marathon - Apr 11
City	Bonn
Date	2027-04-11 at 11:00
Field Size	~1,336 runners
Time Limit	6 hours
Cutoff pace	8:32/km
Timezone	Europe/Berlin
Official Site	Deutsche Post Marathon Bonn
Registration	Register · 74 EUR

Race Day Weather

Average Temperature	7.6°C / 46°F
Humidity	82%
Wind	20.5 km/h
Rain Chance	34%
Typical Conditions	Mild spring morning, average 10°C (50°F) at the 11:00 start, climbing toward a 15°C high. Humidity around 74%, light wind near 15 km/h, and a 27% chance of rain make April one of Bonn's drier, fastest-running months.

What to Prepare: Start in shorts and a long-sleeve top you can shed; a throwaway layer for the corral is wise. With the late 11:00 start and possible 15°C by midday, carry electrolytes and don't overdress.

Based on historical averages for race week. Use our Weather Score Calculator and What to Wear Guide for personalized advice.

Wind Impact on Race Day

Wind at 20.5 km/h can affect your marathon pace by 5-15 seconds per kilometer. Headwinds slow you down exponentially — a 20 km/h wind costs more than twice a 10 km/h wind.

Calculate your wind-adjusted pace →

Race-Week Climate

Based on 20 years of race-week weather (2005-2024), MERRA-2 reanalysis

	Cooler	Typical	Warmer
Temperature	2.8°C	7.5°C	12.6°C
Dew point	-0.5°C	4.3°C	9°C

Wet-day chance: 34% Runnability: 69/100

Data: NASA POWER (MERRA-2 reanalysis), NASA Langley Research Center

Course Profile

Course Type	Two-loop road marathon, traffic-free along the Rhine
Elevation Gain	65m
Terrain	Sealed asphalt roads and riverside promenade. The half marathon runs the loop once; the full marathon runs it twice, finishing at the historic Altes Rathaus (Old Town Hall) on the Marktplatz.
Profile	Flat and fast, roughly 65m total elevation gain across the Rhine valley floor with no significant climbs.
Boston Qualifier	Yes — Check your BQ time

Prepare for 2027 Bonn Marathon - Apr 11

Use our free training tools to get race-ready:

Running Pace Calculator — Min/km, Finish Time & Pace Chart

Free running pace calculator for 5K, 10K, half marathon, and marathon. Get min/km or min/mile, your ...

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Free Pace Band Generator — Printable Race Day Wristband

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Marathon Wake-Up Time Calculator — Race Morning Timeline

7 AM race, wake at 3:45 AM? Enter the gun time; we work backward through meal, gear, bathroom, warm-...

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Wind Effect on Running — How Much Does Wind Slow You?

How much does a headwind actually slow you down? This free calculator turns wind speed and direction...

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Marathon Predictor — 5K, 10K & Half Marathon Race Predictor

Free marathon predictor — convert your 5K, 10K, or half marathon time into race-day estimates from R...

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Race Finish Time Calculator & Predictor — Free

Predict your race finish time from pace, or set a goal time to find required pace. Free instant calc...

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Frequently Asked Questions

How do I register for the Bonn Marathon 2027?

Registration is first-come, first-served with no lottery, opening after the summer holidays in 2026 on the official site deutschepostmarathonbonn.de. The early-bird entry is EUR 74 (until Oct 31), rising in stages to roughly EUR 93 for late entries. Sign up early: the companion half marathon sells out months ahead.

Is the Bonn Marathon flat? How much elevation gain is there?

Yes, it is one of Germany's flattest big-city marathons. Total elevation gain is only about 65 metres across the entire 42.195 km, run on the flat floor of the Rhine valley with no real hills. It is a genuine PR and Boston-qualifying course.

What is the Bonn Marathon course like?

It is a two-loop, traffic-free course along the river Rhine through the federal city. The half marathon covers the loop once; the marathon covers it twice. The finish is in the heart of the old town at the Altes Rathaus (Old Town Hall) on the Marktplatz, where crowds greet every finisher.

Does the Bonn Marathon count as a Boston qualifier?

Yes. The course is DLV and WA/AIMS certified (officially "best-list eligible"), so a qualifying time run here is accepted for Boston Marathon registration. Note the flat profile and cool spring weather make it well suited to chasing a BQ.

What is the time limit for the Bonn Marathon?

The cut-off is 6 hours. With the marathon starting at 11:00, the course closes around 17:00. This is a comfortable limit for first-timers, but check the official start-corral and aid-station closing times before race day.

How big is the Bonn Marathon field?

The full marathon is a mid-size race of roughly 1,300 to 1,500 finishers (about 1,336 in 2025). The widely quoted figure of 22,222 is the all-events record across the marathon, half marathon, relay and shorter races combined, not the 42.195 km field. The half marathon alone holds 12,500 slots.

What should I wear and expect from the weather in Bonn in April?

Expect a mild spring morning around 10°C (50°F) at the 11:00 start, warming toward 15°C (59°F) by midday, with about a 27% chance of rain. Dress in shorts and a long-sleeve top you can remove, and keep a disposable layer for the corral.

Where is the nearest airport to Bonn?

Cologne/Bonn Airport (CGN) is about 25 km away, with Dusseldorf (DUS) around 75 km and Frankfurt (FRA) about 150 km via a direct ICE train. The official site and entry forms are available in English, making it straightforward for international runners.