Centurion Triathlon

Stanborough Lakes, Welwyn Garden City, Hertfordshire

Organiser's Description

Welcome to the Centurion Triathlon, the Vesuvius of multi-sport racing in SE England, with two races from which to choose: 100 mile Imperial or 100k metric.

You’ll need all your armour for the swim, which is two laps of the Stanborough Park amphitheatre for both events. Helmets in place, Imperial and Metric combatants will follow the same bike course, but those tackling the longer distance will complete four rather than two laps. Trail paths and long, straight footpaths will feature on the run, which is 2 laps Metric and 3 laps Imperial.

This innovative Triathlon will help you make the leap from standard to middle distance, or middle to long distance triathlon.

Start Time



  • Imperial Triathlon 100-Mile
    £137.80 BOOK
  • Metric Triathlon 100K
    £100.70 BOOK


Shirt and souvenir for all finishers

Overall 1st, 2nd, 3rd male and female trophy and prizes

Overall 1st relay team trophy and prizes

Age group trophy and prizes in BTF 10 year bands for fastest male and female in each age group

Food and water at feed stations on the bike and run course, and at the finish

Distance markers on the run

Toilets at race HQ and out on the course

NB - A £5 BTF licence fee is payable on the morning of the race for non-BTF members.

Stanborough Lakes, Welwyn Garden City, Hertfordshire AL8 6DQ

By Road: Take Junction 4 off the A1(M), follow the A6129 and signs to Stanborough Park. Use postcode AL8 6DQ for your Satnav.

By rail: The venue is 1 mile from Welwyn Garden City Station, with direct lines to London King's Cross and Cambridge. Welwyn Garden City station is managed and served by Great Northern.

By bus: Arriva buses operate services to Hemel Hempstead, Stevenage, St Albans and beyond.


A pay and display car park is available at Stanborough Lakes.

The race starts and finishes in the same location at Stanborough Lakes

Compulsory race briefing before the start

Anybody over the age of 19 can enter this triathlon

Race numbers and timing chips to be collected at Stanborough Lakes

Detailed race notes will be sent out two weeks before the race

Cut off times: Swim: 1 hour 30 mins; Bike: 7 hours (cumulative); Finish: 10 hours 30 mins (cumulative). Faliure to meet these cut-off times will mean you will be unable to move onto the next stage of the race.

A £5 BTF licence fee is payable on the morning of the race for non-BTF members

All competitors must comply with BTF rules. We strongly recommend that you read them HERE. Only competitors wearing their ID will be allowed in or out of the transition area.

Relay: Minimum 2 athletes, maximum 3 athletes.

METRIC Race Distances

Swim: 2km
Bike: 82km
Run: 16Km

IMPERIAL Race Distances:

Swim: 1.25 miles
Bike: 83.75 miles
Run: 15 miles

Course Details & Cut Off Times

Sorry, booking has closed for this event 🙁

  • Imperial Triathlon 100-Mile
    £137.80 CLOSED
  • Metric Triathlon 100K
    £100.70 CLOSED
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