Stewartby Lake Triathlon

The event is organised by Active Training World

This is a mass-start event. All finishing positions will be calculated based on gun time and not chip time. This is a non-draft legal race. 

This event is for athletes of all abilities.

Online entries: Pay by major credit/debit cards

icon Registration

Registration packs will NOT be posted out in advance of the race.

Registration packs can be collected on race day from 5:30am at race HQ.

All competitors must comply with BTF rules - including being licensed to race.

Non-BTF members are required to pay £5 in cash on race day for a day license.

BTF Members who cannot produce a valid BTF race license are required to pay for a day license.

icon Event Profile


Stewartby Triathlon


Standard 1500m Swim | 37Km Bike | 10Km Run
Sprint - 750m Swim | 20Km Bike | 5Km Run


Run - Off-road
Bike - Very fast course on roads




Water will be provided once on each lap of the run and at the finish.




Run - Yes
Bike - No


Standard: 17
Sprint: 15
(On/Before 31 Dec 2019)





The higher of a £1 / 6% service fee will be applied at the checkout.



This race is supported by High 5 and The British Triathlon Federation. 

If you would also like to support this race then contact us at:

icon Prizes

Finishers medal for all!

Trophies for overall Male 1st, 2nd & 3rd place.

Trophies for overall Female 1st, 2nd & 3rd place.

icon Course Information

The race starts and finishes in the same location at Stewartby Lake near Bedford.

The race consisits of an open water swim, an on-road bike leg and a run on paths.

Bike Course

Run Course

icon Training Plans

ActiveTrainingWorld have free training plans to help you train for this event:


Other Race Information

Race Numbers
You will be provided with two race numbers in your registration pack. Your race number must be clearly visible on your front for the run and on your back for the bike. If you are not using a race belt, please pin one number on your back and one on your front. If you are using a race belt, only one number is required, provided you adjust the position of your race number during each leg of the race.

Parking and Transport
Parking is available near to the lake with a £2 charge payable at registration. The nearest train station is only 300m from race HQ! Stewartby Station, Bedford MK43 9LZ

Changing and Bag Storage
Changing rooms are available. A marshalled baggage area within transition will be provided so you can keep your warm-up clothes safe during the race.

Portaloo toilets will be provided for the event.


By entering this event you agree to the below terms and conditions:

Your details will be passed onto the event organisers for the administration of the race.

Your name, date of birth and email details will be passed onto the chip timing company. Personal details will be deleted 1 week after the event.

Where specified on the booking form any medical information will be passed onto the medical team present at the event. 


1) I declare that I am medically fit to compete & understand that I do so entirely at my own risk.

2) I understand that I enter the race at my own risk and that no person(s) or organisation(s) will be held responsible for any accident, injury or loss to myself, prior to, during or after the event.

3) I understand the organisers reserve the right to alter the arrangements and conditions, should circumstances require.

4) By entering this event, the athlete indicates acceptance of BTF rules.


LOCATION: Stewartby Lake, Green Ln, Bedford MK43 9LY

Location: Stewartby Lake, Green Lane, Stewartby, Bedfordshire, MK43 9LY