Entry through the organiser
Entry details on the organiser’s site →
The organiser, a third party. We take no entries and have no part in the race.
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Gutenberg Halbmarathon Mainz
At a glance
- Race day
- The 2027 race
- Start
- 10:0010:00 AM
- Distance
- 21.1 km13.1 mi
- Half marathon · 10K · Relay
- Time limit
- 3 hours
- In 2026
The course
The organiser's 2026 course description starts the half marathon at the Kurfürstliches Schloss, runs along the Rheinstraße and out through Mombach, turns at the Barbarossaring and comes back through the Neustadt.
- From the Schloss through Neustadt and MombachSchloss, Rheinstraße, Mombach, turn at the Barbarossaring, Neustadt, Altstadt.
- The last four kilometres through the AltstadtGutenbergplatz, Staatstheater, a view of the Dom at km 18 to 19, finish at the Schloss.
- Five aid stations and a three-hour limitWater at km 5, bananas at km 10, Isostar at km 15, and a 3:00 hour finish limit.
Course notes 3 short reads on the course
Whole courseGeometryFrom the Schloss through Neustadt and MombachSchloss, Rheinstraße, Mombach, turn at the Barbarossaring, Neustadt, Altstadt.
The organiser calls the course a sightseeing tour through the heart of Mainz. In its 2026 description the start is on the Große Bleiche next to the Kurfürstliches Schloss. The route goes over the Große Langgasse past the Römisches Theater and reaches the Rheinstraße, where the Rhine is in view between kilometres 2 and 5. From kilometre 4 it continues over the Kaiser-Karl-Ring and the Hattenbergstraße into Mombach, then back into the Neustadt, with the turning point at the Barbarossaring.
Sourced
km 17 to 21.1FinishThe last four kilometres through the AltstadtGutenbergplatz, Staatstheater, a view of the Dom at km 18 to 19, finish at the Schloss.
The 2026 description has the final four kilometres run through the historic Altstadt: past the Gutenbergplatz and the Staatstheater Mainz, with the Mainzer Dom coming into view between kilometres 18 and 19. After kilometre 20 the route follows the Bauerngasse and the Flachsmarktstraße back toward the Schloss, where the finish is.
Sourced
Whole courseTacticsFive aid stations and a three-hour limitWater at km 5, bananas at km 10, Isostar at km 15, and a 3:00 hour finish limit.
The organiser lists water at kilometres 5, 17.5 and 19.5, water and bananas at kilometre 10, and water and Isostar at kilometre 15. The finish limit for the half marathon is 3:00 hours. On the course there is also a donation gate: each runner who passes through it gives 5 euros to the children’s charity Herzenssache.
Sourced
Race weekend
Before race week 1 key date
-
18 Apr 2027
Online registration closes Online registration runs to 23:59 on 18 April 2027; late entries are taken at the bib pick-up desk on 30 April and 1 May 2027.
Friday 30 April Expo
-
12:0012:00 PM–19:007:00 PM
Bib pick-up and expo The Gutenberg Halbmarathon Expo is in the Kurfürstliches Schloss.
Saturday 1 May Expo
-
10:0010:00 AM–19:007:00 PM
Bib pick-up and expo In the Kurfürstliches Schloss. -
10:3010:30 AM
Shake-out run An easy 4 km along the Rhine bank from Ernst-Ludwig-Platz.
Sunday 2 May Race day
-
07:307:30 AM–09:309:30 AM
Bib pick-up Sunday race-morning desk. -
09:309:30 AM–14:002:00 PM
Medal engraving In the Gewölbesaal of the Kurfürstliches Schloss. -
10:0010:00 AM
Half marathon start Half marathon start.
Times as published by the organiser, in Mainz time, checked . Confirm on their site before you travel.
The forecast for Sunday
Race morning, on the record
We hold no start time for this race, so the record is read at 09:009:00 AM, local time.
Add to calendar .ics file, times in Mainz time
Entry
Race fuel
Energy gel
2 gels for Mainz, plus 1 spare
Finish
One every 40 minutes, by the clock:
Under about 75 minutes most runners need no gel: water at the aid stations does it.
- km 7.3mile 4.6
- km 14.7mile 9.1
For your long training runs:
Our pick: SiS BETA Fuel gel, box of 6, strawberry and lime. 40 g of carbohydrate a gel, about twice a usual gel, from two kinds of sugar your body takes up side by side. Enough for race day and two test long runs.
Easy to forget on race morning: pack them with your bib the night before.
Get it on Amazon
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In Canada the button opens GU Energy Gel, Salted Caramel, 24-pack, the best seller there.
Outside the Netherlands, Belgium, Germany, Austria and Switzerland, the UK and Ireland, Spain and Portugal, Italy, the rest of the EU and Canada the button opens GU Energy Gel, Chocolate Outrage, 24-pack on Amazon.com, the best seller there.
Anti-chafe
Compeed anti-blister stick, 8 ml
An invisible layer before the start keeps seams, straps and shoes from rubbing skin raw.
Put it on before you leave for the start: heels and toes, inner thighs, under a bra or heart-rate strap.
Try it on a long run first, like everything you use on race day.
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Number belt
Compressport Race Belt
Holds your bib without safety pins through your top, with loops for up to 8 gels.
Clip the bib on the night before, so it goes on with your shorts in the morning.
Keep the number on the front, where officials and photographers can see it.
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Electrolytes
SiS Hydro electrolyte tablets, tube of 20
One tablet in a bottle puts back some of the salt you sweat out.
One tablet in 500 ml of water in the hour before the start.
Only if you have used them in training: nothing new on race day.
Get it on Amazon
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Blister plasters
Compeed blister plasters, medium, 6
One in a pocket cushions a blister if one starts.
Put it on clean, dry skin and leave it until it comes off by itself.
Give a couple to whoever comes to cheer, so they are there at the km you need them.
Get it on Amazon
We earn a small fee if you buy through these links. The price is the same.
Keep exploring
More races to look at after the Gutenberg Halbmarathon Mainz.
