• slide
  • slide
  • slide
  • slide
  • slide
  • slide
  • slide
  • slide
  • slide

South Coast Triathlon


Click here to enter

Date: Saturday 21st August 2021
Venue: Martello Fields, Seaford, East Sussex, BN25 1JX
Swim: Sea
Olympic & Relay: 1500m swim - 40k cycle - 10k run
Sprint & Relay: 750m swim - 20k cycle - 5k run

Super Sprint & Fun

& Mini Fun Relay:

200m swim - 10k cycle - 2.5k run
Minimum Age: 15 years for Fun, Fun Relay, Super Sprint, Sprint & Sprint Relay distances
16 years for Olympic Relay team members
17 years for Olympic distance individuals
Entry fees from:

£74.95 Olympic (non BTF)   

£69.95 Sprint & Super Sprint (non BTF) 

Please Note: Competitor Race Day Information (Individual Start Times, Bib Numbers etc) will be emailed out to competitors 7-10 days before the event.

For more information, see the sections below:

2021 Results

Please email customercare@uktriathlon.co.uk for any result queries.

The Event

The race offers not only a spectacular seaside venue, but is also a perfect spectator friendly course, ideal for family and friends who come along to support you and watch the non stop action in a fun and relaxed atmosphere. The venue guarantees large crowds to cheer you along whilst you swim, cycle and run. A great weekend or day out for all!

  • Fantastic coastal and spectator friendly venue
  • Open water sea swim
  • Flat, closed to traffic bike course
  • Scenic promenade run
  • All abilities welcome from novice to pro-triathlete
  • 2021 finishers medal for all entrants
  • Prizes for top 3 male and female triathlete in Super Sprint, Sprint, & Olympic races as well as age group prizes in the Sprint and Olympic Triathlon
  • Entries open to 14+ yr olds in the Sprint, Super Sprint & Fun distances
  • South Coast Run follows this event on Sunday 22 August with 1/2 Marathon, 10k and 5k Fun Run

Wave times - start times are approximate & subject to change

09:00 am Olympic - Male

09:45 am Olympic - Female

09:45 am Olympic Relay

11:00 am Sprint - Male

11:10 am Sprint - Female

11:10 am Sprint Relay

11:45 am Fun - Female

11:45 am Super Sprint - Female

11:45 am Fun - Male

11:45 am Super Sprint - Male

More information about your race

Please take some time to read all the event information, it will make it far more enjoyable for you and reduce the need to ask questions on the day. Good luck and have a great day!

2021 Race Day Information

You can use this information as a guide for your event. Full and up to date 2021 competitor race day information with your race number and start time will be emailed to you 7-10 days before the event.

WE DO NOT POST ANYTHING OUT - you will collect your race numbers, tattoos, stickers etc. at registration on the day.

Course Maps

PDF Documents: click each to open or download

South Coast Tri Main Arena Map
South Coast Tri Swim Course Map
South Coast Tri Run Course Map
South Coast Tri Run Course Start & Finish

Bike Map:

To view course direction & distance markers, please click on, “view full version” (top left-hand corner of the map) or run your mouse cursor along the mountain graph to see course direction.


I competed in my first triathlon this year at Seaford.

The organisers and the support staff were the most fantastic people! From the guy who tied my shoelaces just before the cycle start line, to the young girl cheering us through to the finish line, these people were helpful, supportive, friendly and soooo happy! It is down to them that I am going to come back again next year! Please pass on my thanks & gratitude.x


I just wanted to take a few minutes to thank you

And all the staff for the wonderful event. It was my first Triathlon and i was very nervous. I have to say that I was so touched by the encouragements, dedication, professionalism and kindness of the people over there. It was just awesome, fun and unforgettable! I will definitely do it again next year and bring some friends and family. That was just perfect! Thank you,


Just wanted to say how extremely impressed

I was on the organisation of the South Coast Triathlon. Particularly impressed with the compere at the finish line who managed to announce names of competitors as they came through the finish and also where they came from, such a personal touch. I really don't know how he did it, with 3 races going on and also a relay.

Entry Form

South Coast Triathlon 2021 - Entry for this event is now closed.


(Price per race entry or per relay team)

Please select your race from the drop down list below. The price will adjust automatically.

Telephone Entry

If you would prefer to enter over the phone please call

01270 842800 and secure your place today!

(Lines are open Monday to Friday, between 9:30am-3:00pm).


Become a British Triathlon Home Nation member today

✓ Insurance and legal support for training and racing 
✓ Reduced entry fees across permitted triathlon, duathlon and related multi-sport events
✓ Opportunity to win Home Nation and British titles and to represent GB internationally
✓ Exclusive discounts from leading partner brands