Half distance – Age Groups

NOTE! Some changes may occur. Always check the Race guide for updated information.
 The original triathlon distance at Oslo Triathlon is in 2023 organized this year only to mark our 40th anniversary. The two swimmers who founded Oslo Triathlon was heavily inspired by the early Ironman events in Hawai’i. And even went on a study trip where they med Valerie Silks, who gave them good advice in how to organize a triathlon. However due to the water temperature and course limitations they decided to make it a half IM.
The half distance is open for any competitor over 18 years of age.

The course:

  • The swim course is in Lake Sognsvann
  • The bike course runs through Maridalen (2 laps) via Sognsveien and Carl Kjelsens vei.
  • The running course is around Lake Sognsvann (2 laps)


  • 1500 m swim
  • 40 km bike
  • 10 km run

Movie from the very first Oslo Triathlon in 1983:

Registration / Starting Times / Start waves

The start waves are mixed organized mainly by the competitors’ self-reported expected finish time. The start waves consist of 100-150 people each. Your start time will be listed on the start list and indicated on your BIB number. It is your responsibility to start in the correct group. Change of groups can be requested at the latest one week before the race. Oslo Triathlon regrets if we cannot comply with your request.

Program for the day will be announced later on our web page and in the participant guide.

Start wave assignments are published in the start list, which is usually published approximately 2 weeks before the race day:

  • Wave H-1 start 08:00

Check in and starting procedure

The transition area is for participants only and a valid race BIB is required to enter. At check-in, the bicycle brakes are checked and we control that the helmet is CE marked and sits correctly on the head, i.e., that the straps are sufficiently tightened. We really appreciate that all participants check this before check in to avoid unnecessary queuing.

Participants are assigned a spot in the transition area that are marked with your starting number. This space is at your disposal, however bags, backpacks etc. must be labeled with the luggage tag and stored in the designated area along the lower fence. Participants are encouraged to organise their equipment to assure a fast and smooth transition. The transition area will open be open from 07:00 AM and close 20 mins before start to ensure all participants can make it to the swim start in time. To reach the starting line, participants must cross a timing mat/point to register your timing chip. This registration is important to ensure that your time is correctly measured. You can pick up your bike after 12:00 PM.

PLEASE NOTE! If you fail to check in your equipment in the transition area before the closing time race organisers reserve their right to revoke you access to start. To ensure everything runs smoothly for all participants, it is important to allow ample time to check in.

A short prerace briefing is will be held in Norwegian for all participants will be held in the swim start area 10 minutes before each wave, please contact an official if you do not understand Norwegian or something in the brief is unclear to you.

The competition follows general rules for Triathlon set by the Norwegian Triathlon Federation (NTF). All participants are obliged to familiarize themselves with the competition rules (in Norwegian).

Categories are according to the Norwegian Triathlon Federation rules and regulations.

License/ NTF Membership

Oslo Triathlon is a Norwegian Triathlon Federation sanctioned event: All participants are required to have either a membership from their national triathlon federation or to purchase a one day NTF Event license. Read more about the license and prices here (in Norwegian).

Race pack

Your race pack may be picked-up Thursday and Friday during race week at between 09:00 and 19:00 hrs at

Braasport Ullevaal
Sognsveien 75
0855 Oslo
Ph. 22 23 00 33

Nearest stops for public transport are:
Ullevål Stadion Metro or Bus

Nearest parking facility is Ullevål Stadion, there is 1h free parking in the sublevel parking garage.

It will also be possible to pick up your start number at the secretariat on race day between 06:30 AM and up to 1 hour before start. No start numbers will be handed out after this time.

The start number envelope contains a race BIB number (please fill in your emergency information on the back side), race sticker set, temporary tattoos, timing chip w/velcro band.

Due to cause to environmental causes we do no longer require our participants to use our swim caps and will only distributed upon request. Race swim caps are usually of lesser quality than those you buy and for the active triathlete swim caps tend to rack up. You may then use your favourite swim cap if you like. And if you need a swim cap, just ask and we will give you one 🙂

PLEASE NOTE! : The timing chip is the athlete’s responsibility. Timing chip should be delivered immediately after finishing. If you bring the chip home, you must send it quickly and within 3 days to:

RaceTracker AS
Øvre Lundenvei 12
3215 Sandefjord

Chips not returned will be billed NOK 600.


All participants are required to wear a swim cap and we recommend bright colors to make you visible in the water. You way use yoiu / neoprene cap can be used under this. Wet suits are allowed if the water temperature is below 22 degrees, and highly recommended if the water temperature is below 18 degrees and for anyone who is not a skilled swimmer. Expected water temperature is between 16 – 19 ºC.

The swimming arena is a course of 1500 meters, where you always round the buoys on your left side (i.e., you swim anticlockwise). After swimming, you run up to the transition zone for changing. Swimming is monitored by guards on land, from kayaks, SUP and boat/jetski with rescue swimmers.


The cycle route leaves the transition zone, takes Sognsveien to the roundabout and onto Carl Kjelsen’s vei, then left up Maridalsveien. The route continues to Skar in Maridalen, where it turns and the turning point by Margaretakirken (the church ruins in Maridalen) where you do two laps back to Skar. After your third turn at Skar you continue back along Maridalsveien, Carl Kjelsens vei and Sognsveien to the transition zone. You can freely choose your bike type. Helmet is mandatory. Drafting is not allowed: You must be at least 10 meters behind the bike in front or must pass other participants within a maximum of 20 seconds. Violation of the rules may result in disqualification.

After the mountline, there are 500 meters of narrow path with oncoming cyclists before entering Sognsveien. This is a NO-PASS zone (overtaking should be  avoided).


The running segment is on forest roads around Sognsvann. After 1 round, you run a round around the arena before embarking on a new round around Sognsvann. Then into the arena and finish.


There will be drink stations at KM 0/5 and KM 3/8 on the run. And at the turning point at Skar on the bike leg. You will get something to drink and eat after finishing, as well as the opportunity to buy some drinks and food at the arena.

Wardrobe and toilet facilities are at NIH and they are open from 07:00 to 15:00.


Oslo Triathlon / Sportsklubben Rye and NTF comply with Antidoping Norway’s regulations. All participants are responsible for familiarizing themselves with Antidoping Norway’s regulations including routines for testing.


All littering is prohibited and results in immediate disqualification.

Time limits (sweeping)

For security and safety reasons, there will be maximum time restrictions. However, the time constraints will be generous. “Sweeping” will be done after the last participant. The organizer has the right to remove from competition any participant who is taken in by the sweep patrol in boat / car / bike.


The results can be found live on Race Result and via a direct link published on our website.


Påmeldingen er åpen fra 1. februar til 10. august 2023. Påmeldingen er bindende og personlig, men kan i perioden fra 1. mai frem til 25. juli overdras til andre mot et gebyr. Dette skjer via vår samarbeidspartner RaceTracker.



Registration is open from January 11th through August 11. Registration is non-transferable except in the transfer window from May 1 through July 29, when a fee is applied. No transfers will be permitted after/before this period. Transfers are done through our partner, RaceTracker.

Entry fee

Registration fee is according to the registration site.


In addition to a fantastic experience, the participation fee includes a t-shirt, a finish medal in addition to some fruit, foods and drinks at the finish area..

Registration fees are 50 % refundable before May 15th and are non-refundable after this date.