XTERRA Wetsuits Mission Bay Triathlon
San Diego, United States · October · Independent (KOZ Events, San Diego Triathlon Series)
Course: 1 km (0.6 mi) swim, 34 km (21.1 mi) bike, 9 km (5.6 mi) run. 1,000 m (0.62 mi) swim, 34 km (21.1 mi) bike, 9 km (5.6 mi) run; some 2025 listings say 38 km (23.6 mi) bike. Not a full Olympic. Capped at 300 athletes; swim in first two waves only.
Why people love it
- Flat bayside course at sea level; sprint bike is 17 km (10.6 mi), International 34 km (21.1 mi).
- Sheltered cove swim with swim buddies and wave starts; sprint swim is 500 m (550 yd).
- Hotel and parking next to start and finish; San Diego airport is 8 km (5 mi) away.
- Site of the first race in 1974; hosts the state championship.
- Mini, kids, duathlon and aquathlon options help nervous first-timers.
Watch out for
- The swim can be cancelled: on 11 Oct 2026 lifeguards replaced it with a 1.9 km (1.2 mi) run.
- Entry fees are non-refundable, including after a weather change.
- The International is short: 1 km (0.62 mi) swim, 34 km (21 mi) bike, 9 km (5.6 mi) run.
- Several 180-degree bike turns and little run shade.
- Race-morning packet pickup costs 10 USD extra and needs ID and a USA Triathlon card.
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 satisfactionLoved3.6
It sells out and hosts a state championship, but the only athlete comments found are from 2005; the 2026 swim was cancelled with no refunds. · Low confidence
- OrganizationWell run3.8
Clear schedule and maps, and a same-day backup plan with a 1.9 km (1.2 mi) run in 2026; strict no-refund and ID rules. · Medium confidence
- First timer friendlyDoable3.3
The International is capped at 300 and swims in the first two waves; a bigger step than the sprint. · Low confidence
Course traits, not part of the score
- PR potentialFast3.8
Flat 34 km (21.1 mi) bike but shortened from 40 km (24.9 mi), turns and no shade on the run · Low confidence
Swim
Wetsuit odds, water temperature, calm, and the experience of the start. Counts for 16% of the overall score.
- Wetsuit legalUsually4.0
USA Triathlon allows wetsuits up to 25.6 °C (78 °F); the cove was 17.8 °C (64 °F) in April, October unmeasured. · Low confidence
- Water temperatureComfortable3.6
Only reading is 17.8 °C (64 °F) in April; October water is probably 20 to 22 °C (68 to 72 °F) but unmeasured. · Low confidence
- Calm waterMostly calm4.0
Protected cove with no ocean surf, but rain and a king tide cancelled the 2026 swim. · Low confidence
- Swim easeEasy3.9
1,000 m (0.62 mi) in the first two waves; longer exposure to cooler bay water · Low confidence
- Swim experienceGreat3.5
Beach wave start next to the Bahia Resort; no reports on clarity, and a first-race atmosphere helps · Low confidence
- Swim supportGood3.8
Sheltered cove with city lifeguards, ability waves and swim buddies for newcomers; lifeguards cancelled the 2026 swim. · Medium confidence
Bike
Road surface, closures, scenery and wind. Counts for 18% of the overall score.
- Road surfaceMixed3.3
No direct reports; a 2013 guide said the route was picked for better riding surface than the old one. · Low confidence
- Road closuresMostly closed3.6
Fiesta Island and park roads are controlled, bikes turned back at 8:45 am; no detail found on all roads being fully closed · Low confidence
- Bike sceneryBeautiful3.5
Bay and island views on a park loop rather than a destination ride. · Low confidence
- WindSome wind3.2
Open bayside and island with no shelter; early start at 6:40 am usually calmer than afternoon sea breeze · Low confidence
Course traits, not part of the score
- Bike speedFast3.9
Fast flat loops with U-turns over 34 km (21.1 mi) · Low confidence
- Bike flatnessPancake flat4.6
Flat 34 km (21 mi) International bike at sea level. · Medium confidence
- Bike simplicitySome technical parts2.8
2013 guide counted five 180-degree turns on a two-lap course; fast but technical, and wet-weather tips issued in 2026 · Medium confidence
Run
Crowds, aid stations, conditions underfoot and scenery. Counts for 13% of the overall score.
- Crowd supportDecent3.3
Expo, DJ and beer garden at the finish; few spectators reported along the bayside path. · Low confidence
- Aid stationsGood3.6
Run-out water station and standard aid; no athlete reports on volunteers · Low confidence
- Run sceneryBeautiful4.0
Bay views around Bonita Cove and Mariners Basin; 2013 guide said water views nearly the whole way · Low confidence
- Run conditionsEasy3.6
Flat but unshaded over 9 km (5.6 mi) · Low confidence
Course traits, not part of the score
- Run flatnessFlat4.6
Flat 9 km (5.6 mi) bayside path. · Medium confidence
Conditions
Air temperature, how predictable the weather is, setting, and spectating. Counts for 13% of the overall score.
- Air temperaturePleasant4.2
Race-date history is a low near 16 °C (61 °F) and a high near 23 °C (74 °F), about 77% humidity. · Low confidence
- Weather reliabilityVariable3.2
October is usually dry, but rain and a king tide cancelled the 2026 swim. · Medium confidence
- Venue beautyLovely3.8
Mission Bay Park beaches and palms; pleasant rather than dramatic. · Low confidence
- Spectator friendlyEasy4.0
Swim start, transition and finish sit within sight at Ventura and Bonita Cove; wave starts spread the viewing · Low confidence
Course traits, not part of the score
- Low altitudeSea level5.0
Sea level, about 3 m (10 ft) · High 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
Bahia, Hyatt, Hilton and Wyndham listed nearby; Mission Bay resorts fill in peak season, but October is shoulder season · Low confidence
- Hotel valueNormal2.8
Beachfront San Diego resorts are expensive; cheaper options are further inland · Low confidence
- WalkabilityWalkable4.0
Bahia Resort is next to the start and finish; park once at Bonita Cove (across the road from Ventura Cove transition) · Medium confidence
- Travel easeVery easy4.6
San Diego International is about 8 km (5 mi) away; I-5 access · Medium confidence
- LogisticsSimple3.8
One transition at Ventura Cove, finish across the road; packet pickup Friday, Saturday or race morning for 10 USD extra. · Medium confidence
- Town and foodGood4.3
Belmont Park, Mission Beach and Pacific Beach restaurants nearby; beer garden at the finish · Low confidence
Key facts
- Location
- San Diego, California, United States
- Typical month
- October
- Latest or next date
- 11 October 2026
- Organiser
- Independent (KOZ Events, San Diego Triathlon Series)
- Field size
- About 300 athletes
- First held
- 1974
- Distances (non-standard)
- 1 km (0.6 mi) swim, 34 km (21.1 mi) bike, 9 km (5.6 mi) run
- Swim venue
- Ventura Cove, Mission Bay (bay)
- Wetsuit
- Optional
- Swim start
- wave (beach start, ability and age waves)
- Swim laps
- 1
- Run shade
- Little shade, about 80 percent water-side (2013 guide)
- Air temperature
- 16–23 °C (61–73 °F)
- Humidity
- About 77 percent (race-date history)
- Altitude
- 3 m (10 ft)
- Nearest airport
- San Diego International (SAN), 8 km (5 mi) away
- Where to stay
- Mission Bay, Mission Beach, Pacific Beach
- Booking
- Bahia Resort next to start and finish; Dana, Hyatt Regency Mission Bay, Hilton Mission Bay and Wyndham Garden also listed.
What racers and reviewers say
- Mission Bay Triathlon race update (organiser, KOZ Events)Raced 2026 · article · Mixed
Organiser notice for the 11 Oct 2026 race: city lifeguards cancelled the swim before the start because of rain and a king tide. Athletes did a 1.9 km (1.2 mi) out-and-back run instead, then the usual bike and run. Entry fees were not refunded.
- Mission Bay Triathlon course, schedule and parking pagesRaced 2026 · article · Positive
Official pages list the International as about 1,000 m (3,280 ft) swim, 34 km (21.1 mi) bike, 9 km (5.6 mi) run (capped at 300 athletes) and the Sprint as 500 m (1,640 ft), 17 km (10.6 mi), 5 km (3.1 mi). Packet pickup is Friday or Saturday, or race morning with a fee. Transition and swim start are at Ventura Cove, with parking and finish at Bonita Cove across the road.
- Slowtwitch forum: Mission Bay Triathlon Roll CallRaced 2005 · forum · Positive
Racers in 2005 described a big, popular race whose rack space fills early, so people checked bikes in overnight with security. Several called it their first triathlon or yearly season finale. They debated going without a wetsuit for the short swim, and one said the bike loop was shortened that year.
“We love this race. It was the first tri I ever did.”
- Slowtwitch forum: Mission Bay Triathlon Roll Call, page 2Raced 2005 · forum · Positive
Post-race comments: finishers called out good swims and bikes and weak runs, one forgot a race number and ran back for it, and another noted the bike course was cut short. Tone is friendly and age-group focused, with plenty of hardware in small age groups.
- Triathlete: ITU WTS San Diego course secrets (same venue)Raced 2013 · article · Positive
Guide to the World Triathlon San Diego age-group race on the same cove and island, a different event. It gives cove water as 17.8 °C (64 °F), calls the bike fast but technical with five 180-degree turns, and says about 80% of the run is flat, water-side and shadeless.
Show 3 more
- Pepperdine Graphic: TriWaves at the UCSD Tritonman, Fiesta IslandRaced 2011 · article · Mixed
Student report from a different race (UCSD Tritonman) on Fiesta Island: a cold, rainy morning where the swim was cancelled and replaced by a second run, with muddy transitions. Useful as a precedent for how wet October-to-spring mornings can change races here.
- XTERRA Wetsuits blog: Southern California top ten sprint and Olympic racesRaced 2024 · article · Positive
Title sponsor's own blog, so promotional. It says the race sells out every year, the 2024 edition was so full that people tried to bandit the course, and finishers got to ring a gong at an awards party. It also stresses the 1974 birthplace-of-triathlon history.
- Discover San Diego event listingRaced 2023 · aggregator · Positive
Tourism listing pitches the race at beginners: a mini distance, swim buddies for newer triathletes, free weekly training groups, and a duathlon or aquathlon for people who would rather not swim. Promotional, with no athlete reviews attached.
Raced XTERRA Wetsuits Mission Bay Triathlon? Your notes on the course, conditions and logistics help the next athlete decide.
Sources
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