IRONMAN 70.3 Bolton
Bolton, United Kingdom · June · IRONMAN
Why people love it
- Big crowds on Chorley New Road and a finish at Bolton Town Hall
- Cool 15-18 °C (59-64 °F) racing, rarely a heat problem
- Wetsuit swim in a sheltered country-park lake
- Part of a 10,000-athlete weekend with IRONKIDS
Watch out for
- Hilly bike of 757-840 m (2,484-2,756 ft) with exposed moorland crosswinds
- Swim at Pennington Flash and finish in Bolton are about 15 km (9 mi) apart
- Cool, changeable weather and cold 14-19 °C (57-66 °F) water
- Almost no first-person reviews exist and sources disagree on elevation
Race
How racers feel about it, how well it is run, and how it treats a first timer. Counts for 27% of the overall score.
- Racer satisfactionLoved3.5
No first-person reviews were found. Council recaps report record crowds and atmosphere, offset by a hard, hilly bike. · Low confidence
- OrganizationWell run3.7
Council-backed repeat event with a multi-day festival and record 2026 turnout. No athlete complaints were found. · Low confidence
- First timer friendlyDoable2.9
Cool weather and a town run help, but 840 m (2,756 ft) of bike climbing and a split venue make it demanding. · Low confidence
Course traits, not part of the score
- PR potentialAverage2.6
Hilly bike of up to 840 m (2,756 ft) and changeable weather. A UK preview says times run slower than flat 70.3s. · Low confidence
- Course easeTough2.7
Hilly 840 m (2,756 ft) bike, but cool temperatures. · Low confidence
Swim
Wetsuit odds, water temperature, calm, and the experience of the start. Counts for 15% of the overall score.
- Wetsuit legalAlmost always4.5
Water is 14-19 °C (57-66 °F), well below the 24.5 °C (76.1 °F) limit, and wetsuits are usually allowed. · Medium confidence
- Water temperatureAcceptable2.7
At 14-19 °C (57-66 °F) the water is cold to cool, though a wetsuit makes it manageable. · Medium confidence
- Calm waterMostly calm3.9
Sheltered inland lake, though open to wind. No race-day swim reports were found. · Low confidence
- Swim easeEasy3.8
Single loop in a small, shallow country-park lake with no current. · Low confidence
- Swim experienceFine3.2
Shallow country-park lake. No athlete has described the water clarity or the start. · Low confidence
Bike
Road surface, closures, scenery and wind. Counts for 19% of the overall score.
- Road surfaceMixed2.9
Rural Lancashire lanes and town roads. No direct surface reports, and UK roads are often patched. · Low confidence
- Road closuresMostly closed4.0
The council announced route and road closures. · Medium confidence
- Bike sceneryPleasant3.4
Lancashire countryside and moors, mixed with urban sections. · Low confidence
- WindSome wind2.8
Exposed moorland sections can bring crosswinds. · Low confidence
Course traits, not part of the score
- Bike speedAverage2.7
840 m (2,756 ft) over 90 km (56 mi) on lanes, with exposed moorland crosswinds. · Low confidence
- Bike flatnessRolling3.0
Sources give 757-840 m (2,484-2,756 ft) of gain, mid-range for a 90 km (56 mi) bike. One preview claims far more. · Medium confidence
- Bike simplicitySome technical parts2.9
A preview calls it technical, with multi-loop lanes and town sections. · Low confidence
Run
Crowds, aid stations, conditions underfoot and scenery. Counts for 13% of the overall score.
- Crowd supportStrong4.1
Council reports crowds lining Chorley New Road and the Town Hall finish. · Medium confidence
- Aid stationsGood3.5
Standard IRONMAN aid. Rouvy lists bike aid at 15.5, 33.9, 47 and 73.3 km (9.6, 21.1, 29.2 and 45.6 mi). · Low confidence
- Run sceneryPleasant3.3
Town centre and Queen's Park. · Low confidence
- Run conditionsEasy3.8
Cool race-date highs of 15-18 °C (59-64 °F) on street surfaces, though rolling. · Low confidence
Course traits, not part of the score
- Run flatnessRolling3.4
Described as rolling town-centre loops. No elevation figure. · Low confidence
Conditions
Air temperature, how predictable the weather is, setting, and spectating. Counts for 15% of the overall score.
- Air temperatureWarm or cool3.4
Race-date highs of 15-18 °C (59-64 °F) are cool, with occasional rain. · Medium confidence
- Weather reliabilityVariable2.7
Typical changeable northern England weather. · Low confidence
- Venue beautyPleasant3.2
Industrial-heritage town with a Victorian Town Hall and a country-park swim. · Low confidence
- Spectator friendlyEasy3.6
Good run loops and bike crowds, but the venue is split between the Flash and the town. · Low confidence
Course traits, not part of the score
- Low altitudeSea level4.9
Near sea level, roughly 30-110 m (100-360 ft). · High confidence
Stay and travel
Hotels, walkability, getting there, and the town around the race. Counts for 11% of the overall score.
- Hotel availabilityBook early3.4
The weekend drew over 10,000 people, so local hotels fill. Manchester is the fallback. · Low confidence
- Hotel valueGood3.6
Northern UK city pricing; no race-week data was found. · Low confidence
- WalkabilitySome driving2.5
The swim is about 15 km (9 mi) from the town, and transitions are split. · Low confidence
- Travel easeEasy4.1
Manchester Airport and rail links are nearby. · Medium confidence
- LogisticsSome complexity2.5
Swim at Pennington Flash and finish in Bolton require transfers. · Medium confidence
- Town and foodFine3.4
Standard northern town, with Manchester close by. · Low confidence
Key facts
- Location
- Bolton, Greater Manchester, England, United Kingdom
- Typical month
- June
- Latest or next date
- 6 June 2027
- Organiser
- IRONMAN
- Distances
- 1.9 km (1.2 mi) swim, 90 km (56 mi) bike, 21.1 km (13.1 mi) run
- Swim venue
- Pennington Flash Country Park, Leigh (lake)
- Water temperature
- 14–19 °C (57–66 °F)
- Wetsuit
- Legal
- Swim laps
- 1
- Bike climbing
- 840 m (2,760 ft)
- Bike laps
- 2
- Key climbs
- Victoria Road / Old Kiln Lane to Queen's Park
- Run laps
- 2
- Air temperature
- 9–18 °C (48–64 °F)
- Nearest airport
- Manchester (MAN)
- Where to stay
- Bolton town centre, Manchester city centre
- Booking
- Bolton weekend drew over 10,000 athletes including 6,000 IRONKIDS in 2026, so local hotels fill; Manchester is a fallback.
What racers and reviewers say
- Bolton Council 2026 race recapRaced 2026 · article · Positive
Council recap of a record weekend of over 10,000 athletes including 6,000 IRONKIDS, with crowds along Chorley New Road and at the Town Hall finish.
- Bolton Council 2025 recapRaced 2025 · article · Positive
Reports over 8,000 athletes across the weekend and strong spectator support along Chorley New Road.
- The Triathlete UK previewRaced 2026 · article · Mixed
Preview calls the bike the main challenge and brutal, with exposed moorland crosswinds and slower times than flat 70.3s; swim is 14-18 C (57-64 F) with wetsuits usually allowed. Warns run lap one is often raced too fast. Its 1,200-1,500 m (3,900-4,900 ft) elevation figure conflicts with other sources.
- Rouvy bike course pageRaced 2026 · article · Mixed
Course profile with 757-840 m (2,484-2,756 ft) of gain, two loops of Lowton/Abram/Bickershaw and two around Horwich/Bolton, with the main climb on Victoria Road and Old Kiln Lane to Queen's Park.
- Horwich RMI Harriers club reportRaced 2026 · blog · Mixed
Club results note the bike includes most of Rivington's tougher roads; local runners finished 8th overall in 4:14:09 and 4:15:28 for the next. Mostly results, not opinions.
Show 2 more
- RaceRaves race pageRaced 2026 · aggregator · Mixed
No reviews yet; lists 840 m (2,756 ft) ascent, rolling bike and run, 19 C (66 F) water and race-date highs of 15-18 C (59-64 F).
- Tri247 2021 resultsRaced 2021 · article · Positive
Results report from the inaugural-era race; Kelly Warrington used local knowledge to ride the 90 km (56 mi) bike in 2:47:00, far faster than the field (from search summary).
Sources
Pages we used for facts and ratings. See how we rate.
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