31 Most Popular Triathlons in United Kingdom 2026 — by Audience Size

How to read this list

Rank

Position in the Top 31, sorted by audience size from largest to smallest. Updated weekly.

Audience size

Estimated number of unique people in United Kingdom who actively engage with this audience, derived from anonymized search-behavior signals.

Country share

Share of the global audience that is active in United Kingdom. A higher value means the audience is more locally concentrated here.

Avg age

Average age in years across the people who engage with this audience in United Kingdom, derived from anonymized search-behavior signals. A dash means demographic data is not yet available.

Female share

Share of women among the people who engage with this audience in United Kingdom. 50% is gender-balanced; values above mean female-skewed, below mean male-skewed.

Ranking

Rank	Audience	Audience size	Country share	Avg age	Female share	Subtype
1	IIronman World Championship	615k	10.8%	39.2	45.5%	Triathlon
2	IIronman 70.3	543k	8.3%	39.9	43.6%	Triathlon
3	MMark Allen (triathlete)	315k	48.4%	38.2	36.0%	Triathlon
4	LLondon Triathlon	194k	89.2%	44.4	30.8%	Triathlon
5	CCraig (CROWIE) Alexander	98k	7.9%	40.6	41.9%	Triathlon
6	WWorld Triathlon	61k	10.5%	38.9	40.9%	Triathlon
7	AAlistair Brownlee	59k	58.8%	47.8	40.4%	Triathlon
8	EEscape from Alcatraz (triathlon)	38k	4.6%	36.8	48.1%	Triathlon
9	CChallenge Roth	27k	5.4%	35.6	44.2%	Triathlon
10	UUSA Triathlon	26k	6.1%	41.4	39.4%	Triathlon
11	IIronman Heavymetalweight Championship	20k	2.7%	46.6	59.3%	Triathlon
12	IIronman Triathlon	12k	1.4%	40.2	43.3%	Triathlon
13	JJan Frodeno	12k	4.8%	43.1	28.6%	Triathlon
14	CChris McCormack (triathlete)	9.7k	16.4%	37.6	39.3%	Triathlon
15	BBritish Triathlon Federation	8.7k	38.5%	46.7	35.0%	Triathlon
16	IIRONMAN Austria	7.4k	7.3%	38.5	47.1%	Triathlon
17	SSupertri	7.1k	15.4%	40.1	43.4%	Triathlon
18	DDave Scott (triathlete)	6.8k	6.2%	40.0	43.2%	Triathlon
19	IInternational Triathlon Union	5k	4.1%	41.4	34.7%	Triathlon
20	SSarah Haskins (triathlete)	4k	10.7%	36.3	35.5%	Triathlon
21	TTimothy O'Donnell (triathlete)	3.8k	9.3%	38.6	41.2%	Triathlon
22	XXTERRA Triathlon	3k	1.5%	30.8	4.8%	Triathlon
23	IITU Long Distance Triathlon World Championships	1.7k	10.8%	39.8	32.6%	Triathlon
24	IIronman Germany	1.6k	0.8%	43.3	45.0%	Triathlon
25	GGwen Jorgensen	1.3k	4.2%	39.3	39.4%	Triathlon

Want the full picture for any of these audiences?

Open any profile to see psychographics, top regions, peer affinities and demographic splits — all derived from the same anonymized signals.

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Frequently asked questions

How is this list of the most popular triathlons compiled?

Rascasse aggregates anonymized search-behavior signals across United Kingdom and ranks each triathlon by its estimated audience size. Only entries with at least 5 measured entities are listed.

How often is the list updated?

The ranking is refreshed weekly from the latest search-behavior data and re-published as a static page.

What is the largest triathlon in United Kingdom?

Ironman World Championship currently leads with an estimated audience of 615k people in United Kingdom.

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