Polar Bear Triathlon
Brunswick, United States · May · Bowdoin College / Tri-Maine (originally IronBear Triathlon)
Course: 0.5 km (0.3 mi) swim, 18.5 km (11.5 mi) bike, 4.8 km (3.0 mi) run. 525 m or 525 yd pool (480 to 525 m / 0.30 to 0.33 mi) / 11.5 mi (18.5 km) / 3 mi (4.8 km)
Why people love it
- Pool swim of 480 to 525 m (0.3 mi), so no open water worries.
- Bike is fairly flat with coastal Maine views and one hill near mile 7 (11 km).
- Compact Bowdoin campus: swim, transition and finish all in one place.
- Sold out in under 45 minutes in 2008 and was full in 2026, so enter early.
Watch out for
- Bike roads are open to traffic; cars passed riders in 2023.
- Run is mostly trail and grass with a hill and wind; trail shoes can help.
- Swim length is quoted as yards in some sources and metres in others.
- Early May in Maine can be cool and breezy, around 8 to 20 °C (46 to 68 °F).
- The 2026 race was 2 May; the 2027 date is not confirmed but is likely early May.
Race
How racers feel about it, how well it is run, and how it treats a first timer. Counts for 30% of the overall score.
Toughness: Moderate
- Racer satisfactionLoved4.1
A first-time racer and a team member reported good days: friendly finish atmosphere, flat bike, awards and food. · Medium confidence
- OrganizationWell run3.9
Chip tracking, staggered waves and body marking at the field house; a college and Tri-Maine run event, 22 editions. · Low confidence
- First timer friendlyFriendly4.3
Heated pool swim, staggered waves, a first-timer who loved it, and sell-out demand; open traffic on the bike is the catch. · Medium confidence
Course traits, not part of the score
- PR potentialAverage3.4
Pool swim and mostly flat bike, but the run is trail and grass with a hill and wind. · Low confidence
Swim
Wetsuit odds, water temperature, calm, and the experience of the start. Counts for 16% of the overall score.
- Wetsuit legalRarelyn/a
Not applicable: the swim is in an indoor pool. · High confidence
- Water temperatureComfortable4.3
Indoor pool, so no cold-water shock; temperature is not published. · Low confidence
- Calm waterRoughn/a
Not applicable: the swim is in an indoor pool. · High confidence
- Swim easeVery easy4.5
Pool lanes with no sighting, current or waves. · Medium confidence
- Swim experienceGreat3.9
A first-timer loved the pool swim; pool starts feel less like an open-water race. · Low confidence
- Swim supportGood4.4
Pool with staggered timed waves and no open water risk. · Medium confidence
Bike
Road surface, closures, scenery and wind. Counts for 18% of the overall score.
- Road surfaceMixed3.3
Road surface is not described. · Low confidence
- Road closuresMostly open2.3
A 2023 report says roads are open to traffic and cars passed riders. · Medium confidence
- Bike sceneryBeautiful4.0
A first-time racer called the coastal Maine landscape idyllic. · Low confidence
- WindSome wind3.2
Breezy in 2023; coastal Maine. · Low confidence
Course traits, not part of the score
- Bike speedFast3.6
Fairly flat with one hill near mile 7 (11 km); breezy in 2023. · Low confidence
- Bike flatnessMostly flat3.9
Two riders call it fairly flat with one hill; no elevation figure is published. · Low confidence
- Bike simplicityMostly simple3.6
A single 18.5 km (11.5 mi) loop on public roads. · Low confidence
Run
Crowds, aid stations, conditions underfoot and scenery. Counts for 13% of the overall score.
- Crowd supportStrong3.7
The finish was described as ecstatic; a soccer field loop keeps runners in view. · Low confidence
- Aid stationsGood3.5
Two aid stations reported on the run. · Low confidence
- Run sceneryBeautiful3.7
Wooded trail and a soccer field loop. · Low confidence
- Run conditionsModerate3.2
Mostly trail, grass and some road, with a hill and wind on open parts. · Low confidence
Course traits, not part of the score
- Run flatnessRolling3.4
Trail and grass with one hill; no elevation figure. · Low confidence
Conditions
Air temperature, how predictable the weather is, setting, and spectating. Counts for 13% of the overall score.
- Air temperaturePleasant3.7
Early May in coastal Maine; 18 °C (64 °F) and breezy on one race day. · Low confidence
- Weather reliabilityVariable3.1
Early May weather in Maine is changeable. · Low confidence
- Venue beautyLovely3.6
Campus venue with a field house and pool. · Low confidence
- Spectator friendlyEasy3.9
Compact campus with the pool, field loop and finish in one place. · Low confidence
Course traits, not part of the score
- Low altitudeSea level5.0
About 20 m (65 ft) above sea level. · Medium confidence
Stay and travel
Hotels, walkability, getting there, and the town around the race. Counts for 10% of the overall score.
- Hotel availabilityBook early3.3
Brunswick and Portland lodging; no data on race weekend. · Low confidence
- Hotel valueNormal3.3
No price data. · Low confidence
- WalkabilityWalkable4.0
Pool, transition and finish are all on the campus. · Low confidence
- Travel easeEasy3.6
About 40 km (25 mi) from Portland airport. · Low confidence
- LogisticsSimple3.8
One campus site, pool start, chip tracking and body marking at the field house. · Low confidence
- Town and foodGood3.9
Brunswick is a college town; awards and food followed the race. · Low confidence
Key facts
- Location
- Brunswick, Maine, United States
- Typical month
- May
- Organiser
- Bowdoin College / Tri-Maine (originally IronBear Triathlon)
- Field size
- About 400 athletes
- First held
- 2003
- Distances (non-standard)
- 0.5 km (0.3 mi) swim, 18.5 km (11.5 mi) bike, 4.8 km (3.0 mi) run
- Swim venue
- Bowdoin College pool and field house, Brunswick (pool)
- Swim start
- pool, staggered timed waves
- Bike laps
- 1
- Key climbs
- One notable hill about mile 7 (11 km)
- Run laps
- 2
- Run shade
- Wooded trail
- Air temperature
- 8–20 °C (46–68 °F)
- Humidity
- Moderate (estimate)
- Altitude
- 20 m (66 ft)
- Nearest airport
- Portland International Jetport (PWM), 45 km (28 mi) away
- Where to stay
- Brunswick, Freeport
- Booking
- College teams drive up the day before and stay in a Brunswick motel; Bowdoin dining hall used by Dartmouth team.
What racers and reviewers say
- Dartmouth Admissions blog, first triathlonRaced 2024 · blog · Positive
First-time racer from the Dartmouth club loved the pool swim and called the bike his favourite part: fairly flat with idyllic coastal Maine views. The two-lap run felt good and the finish atmosphere was ecstatic; awards and food followed.
“fairly flat and the coastal Maine landscape was idyllic”
- Dartmouth Triathlon Team race reportRaced 2023 · blog · Positive
Report on a 64 °F (18 °C) breezy morning: staggered waves, tracking chips and body marking at the field house, bike roads open to traffic with a hill near mile 7 (11 km), and a mostly trail run with wind on the open parts. Finished in about 1:20 with PRs.
- Valley News season finale reportRaced 2018 · article · Positive
Report on 5 May 2018: 525 yd pool, 11.5 mi (18.5 km) loop and a 3 mi (4.8 km) run with road and trail sections. Mostly Dartmouth and Bowdoin students with some independents. Results report, little on the experience.
- MDIslander, 22nd editionRaced 2024 · article · Positive
Local coverage of triathletes from Mount Desert Island placing on the podium at the 22nd edition; confirms the 525 yd pool, 11.5 mi (18.5 km) bike and 3 mi (4.8 km) run.
- Bowdoin Orient history, 2008Raced 2008 · article · Positive
Student paper notes the race began as IronBear, was renamed after a legal letter in 2007, community slots sold out in under 45 minutes, and the college sponsors with Tri-Maine organising. Old source, but shows sell-out demand.
Raced Polar Bear Triathlon? Your notes on the course, conditions and logistics help the next athlete decide.
Sources
Pages we used for facts and ratings. See how we rate.
Training for Polar Bear Triathlon? Moku Coach builds your plan around race day.