Knysna Extreme Triathlon (KET)
Knysna, South Africa · November · Extreme Triathlon Series (XTRI)
Why people love it
- Africa's only extreme triathlon: 5 km (3.1 mi) swim, 174 km (108 mi) bike, 50 km (31 mi) forest run
- Point-to-point finish at Diepwalle Forest Station
- Part of the XTRI Extreme Triathlon Series
- Small, close-knit field limited to 100 individuals
Watch out for
- Not a standard full: about 229-239 km (142-148 mi) overall
- Mandatory supporter and crew; self-supported
- Cold, wet weather with sub-zero temperatures (0 °C (32 °F) / 32 °F or below) reported; tidal swim
- 2026 route revised for storm damage, listed at about 176 km (109 mi) and 52 km (109 mi and 32 mi)
- Very few first-person reviews exist
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 satisfactionLoved3.9
Returning athletes and positive local press ('amazing race') over eight or nine editions; 2021 weather drew mixed reports and first-person accounts are few. · Low confidence
- OrganizationWell run3.7
Ran 2018-2025 including Covid years and adapted routes (a 2022 swim tweak, a 2026 storm reroute); the field is small and public detail is thin. · Low confidence
- First timer friendlyExperts only1.0
Self-supported with a mandatory crew over about 229 km (142 mi); only 17-23 finished the full in several years, though a half exists. · High confidence
Course traits, not part of the score
- PR potentialVery slow1.0
5 km (3.1 mi), 174 km (108 mi) and 50 km (3.1, 108, 31 mi) with about 3,600-3,800 m (11,800-12,500 ft) of climbing; winners take around 12 hours. · High confidence
- Course easeExtreme1.0
A 5 km (3.1 mi) tidal swim, 174 km (108 mi) over passes, then a 50 km (31 mi) forest-road run in cold and rain. · High confidence
Swim
Wetsuit odds, water temperature, calm, and the experience of the start. Counts for 15% of the overall score.
- Wetsuit legalAlmost always4.6
Water temperature is not published; November estuary water is likely 16-20 °C (61-68 °F) and reported as chilly, so wetsuits are probably legal. · Low confidence
- Water temperatureAcceptable3.0
No temperature is published; athletes report chilly water at the dark start, probably 16-19 °C (61-66 °F). · Low confidence
- Calm waterChoppy2.4
2021 was 'incredibly tough and choppy' with wind against a strong outgoing tide; 2022 was favourable after a route change. It is a tidal estuary. · Medium confidence
- Swim easeHard1.8
5 km (3.1 mi) from a dark 05:00 estuary start with the tide against you on the return; several withdrew early in 2021. · Medium confidence
- Swim experienceFine3.2
A scenic lagoon from Thesen Island, but a dark, tide-dependent mass start; few athletes have written about it. · Low confidence
Bike
Road surface, closures, scenery and wind. Counts for 19% of the overall score.
- Road surfaceMixed3.0
National roads (N2, N12, N9) and Karoo roads; no direct surface reports. · Low confidence
- Road closuresMostly open2.0
Open public roads with support vehicles; no closures are described. · Low confidence
- Bike sceneryBeautiful4.4
Coast, forest passes and semi-desert Karoo. · Medium confidence
- WindWindy2.2
Headwinds in 2018 and 2021 and strong crosswinds on Seven Passes; a tailwind across the Klein Karoo in 2025. · Medium confidence
Course traits, not part of the score
- Bike speedSlow1.5
174 km (108 mi) over Outeniqua Pass and Seven Passes with headwinds; the 2019 winner's bike split was 6:26. · Medium confidence
- Bike flatnessMountainous1.2
About 3,600-3,800 m (11,800-12,500 ft) of total climbing, mostly on the bike over passes up to about 800 m (2,600 ft). · Medium confidence
- Bike simplicitySome technical parts2.5
Pass climbs and descents, with mist reported on Outeniqua Pass in 2025. · Low confidence
Run
Crowds, aid stations, conditions underfoot and scenery. Counts for 13% of the overall score.
- Crowd supportLonely1.2
Remote forest and Karoo roads with only crews, and a small crowd at the Diepwalle finish. · High confidence
- Aid stationsThin2.0
Self-supported with your own crew; official aid is limited. · Low confidence
- Run sceneryBeautiful4.4
Knysna Forest and Prince Alfred's Pass. · Medium confidence
- Run conditionsBrutal1.3
50 km (31 mi) of gravel and forest road in rain and cold after a long bike; many walk the last 17-33 km (11-21 mi). · Medium confidence
Course traits, not part of the score
- Run flatnessHilly2.0
Prince Alfred's Pass undulates from Avontuur to Diepwalle after 174 km (108 mi); the run's share of climbing is not published. · Medium confidence
Conditions
Air temperature, how predictable the weather is, setting, and spectating. Counts for 15% of the overall score.
- Air temperatureWarm or cool2.5
Race-day air has ranged 5-22 °C (41-72 °F), with cold, mist and rain in 2021 and 2025. · Medium confidence
- Weather reliabilityUnsettled1.9
The 2021 edition had storms and cold, 2025 had mist and rain, 2020 and 2022 were excellent, and 2026 was rerouted for storm damage. · High confidence
- Venue beautyLovely4.4
A Garden Route lagoon, mountain passes and indigenous forest. · Medium confidence
- Spectator friendlyTricky1.5
A point-to-point over about 229 km (142 mi); spectators are mainly at the start and finish. · Medium confidence
Course traits, not part of the score
- Low altitudeModerate3.4
The highest point is about 800 m (2,600 ft) on Outeniqua Pass; the swim and finish are at 300-400 m (1,000-1,300 ft) or lower. · Low confidence
Stay and travel
Hotels, walkability, getting there, and the town around the race. Counts for 11% of the overall score.
- Hotel availabilityGood4.0
Knysna has many hotels and B&Bs, and November is shoulder season. · Low confidence
- Hotel valueGood3.7
Thesen Island hotels rate about 9.1-9.2/10 at mid to high prices; shoulder-season South Africa is moderate. · Low confidence
- WalkabilitySome driving3.0
The swim start is near Thesen Island hotels, but the finish at Diepwalle is about 25 km (16 mi) away and the bike leaves town. · Medium confidence
- Travel easeOne connection3.4
George airport is about 65 km (40 mi) and an hour away; long-haul for international visitors. · Medium confidence
- LogisticsFiddly1.5
A point-to-point with different start and finish locations and a mandatory crew. · High confidence
- Town and foodGreat4.5
Knysna is a popular Garden Route town with waterfront dining. · Medium confidence
Key facts
- Location
- Knysna, Western Cape, South Africa
- Typical month
- November
- Latest or next date
- 7 November 2026
- Organiser
- Extreme Triathlon Series (XTRI)
- Field size
- About 25 athletes
- Entry fee
- About $320
- First held
- 2018
- Distances
- 3.8 km (2.4 mi) swim, 180 km (112 mi) bike, 42.2 km (26.2 mi) run
- Cutoffs
- Finish 24:00 (midnight finish cut-off, same day; 05:00 start)
- Swim venue
- Knysna Estuary/Lagoon (from Thesen Island or SANParks jetty), out-and-back (fjord)
- Swim start
- mass
- Swim laps
- 1
- Bike laps
- 1
- Key climbs
- Outeniqua Pass; Seven Passes road
- Run laps
- 1
- Run shade
- Forest at Diepwalle; open Karoo start
- Air temperature
- 5–22 °C (41–72 °F)
- Humidity
- moderate-high on coast; cold and misty in mountains
- Altitude
- 300 m (985 ft)
- Nearest airport
- George Airport (GRJ), 65 km (40 mi) away
- Where to stay
- Thesen Island, Knysna waterfront
- Booking
- Small event; Knysna is a busy Garden Route tourist town but November is shoulder season. Thesen Island hotels are by the swim start.
What racers and reviewers say
- Knysna-Plett HeraldRaced 2018 · article · Positive
Report on the inaugural 2018 edition: a 4 km (2.5 mi) estuary swim against a strong outgoing tide, a 170 km (106 mi) bike into headwinds over Outeniqua Pass, then a 50 km (31 mi) run along Prince Alfred's Pass. Twenty of 25 starters beat the midnight cut-off. First woman called it an amazing race.
“What an amazing race!”
- Knysna-Plett HeraldRaced 2018 · article · Positive
Short wrap-up of the first edition saying it did not disappoint athletes or supporters and tested fitness and mental strength. Organisers called it one of South Africa's toughest triathlons and promised a return.
- Knysna-Plett HeraldRaced 2019 · article · Positive
Preview of the second edition introducing the 0.5 for less experienced athletes. Organiser Sean Sandiford positions it as Africa's only extreme triathlon and notes the first race drew 29 participants. Lists 2019 entry fees (R4,500 individual).
- Knysna-Plett HeraldRaced 2019 · article · Mixed
2019 recap: 05:05 dark start, chilly water and harsh wind chill, then a brutal outgoing tide on the swim return. Seventeen people finished the full 229 km (142 mi) (about 3,600 m (11,810 ft) / 11,800 ft of climbing); winner Manfred Wiehahn took 12:52:15 with a 6:26 bike and 4:44 run.
- Knysna-Plett HeraldRaced 2020 · article · Positive
Third edition on 21 Nov 2020: chilly water at the start, then clear skies all day. Wiehahn won in 11:52:41 for a third straight title, nearly an hour faster than 2019. The article says many athletes already plan to come back.
Show 6 more
- Knysna-Plett HeraldRaced 2021 · article · Mixed
The 2021 edition had record entries but harsh weather: windy 05:30 swim with strong current and early withdrawals, headwinds on the bike, then wind and rain on the 50 km (31.1 mi) run with some reports of sub-zero temperatures. Weather far exceeded anyone's expectations.
- Knysna-Plett HeraldRaced 2021 · article · Negative
Longer 2021 narrative: estuary swim 'incredibly tough and choppy' on an outgoing tide, strong crosswinds on the Seven Passes bike route, and a cold wet run. Winner Greg Laxton collapsed from exhaustion; the last finisher came in five minutes before midnight.
“incredibly tough and choppy”
- Knysna-Plett HeraldRaced 2022 · article · Positive
Best weather of any edition so far, and a swim route change gave a favourable current. James Crawford won in 11:57:49. Several athletes walked the last 17-33 km (11-21 mi) with injuries, and the series finisher was celebrated.
- Knysna-Plett Herald (PressReader)Raced 2023 · article · Positive
Report on the sixth edition on 18 Nov 2023, crowning two new champions. Confirms the 5 km (3.1 mi) / 174 km (108 mi) / 50 km (3.1 mi / 108 mi / 31 mi) format; organisers stress determination needed. (Page body not fetched; based on search excerpt.)
- Knysna-Plett HeraldRaced 2025 · article · Positive
Anna Haw became first woman to win outright (12:21:11) among 23 full-race starters from six countries. Mist and isolation on Outeniqua Pass, a tailwind across the Klein Karoo, then rain and dropping temperatures at the start of the run.
- Expedia / Trip.com (Thesen Island hotels)hotel-review · Positive
Booking-site reviews for Thesen Island hotels near the swim start: Turbine Hotel & Spa ~9.2/10 from 186 reviews, The Lofts Boutique Hotel ~9.1/10 from about 55-61 reviews, praising location, food and staff. Not race-specific.
Sources
Pages we used for facts and ratings. See how we rate.
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