After some years of successful racing around Europe with her former coach Mario Huys Allen received Austrian citizenship in 2002 and started racing in the World Cup.

She took silver in only her third World Cup in Hamburg, Germany and won silver at the European Championships in Valencia, Spain.

Just eight years after beginning the sport, Allen won the 2004 Olympic triathlon in Athens.
At the end of the swim leg Allen was in 44th place in the field of 51.
 After the bicycle leg she was in 28th.
During the run she progressively overtook twenty seven competitors to power past then-leader Australian Loretta Harrop just 150 metres from the finish line, winning the race in emphatic style.

Alongside her Olympic distance triathlon career, Allen showed several strong performances in racing at the Ironman distance.
In 2002, she recorded the fastest Ironman debut time ever, completing the course in 8:58:24.
She topped her performance in 2003, finishing in 8:54:01 hours, a personal record that still stands.

After the Olympic Games in Athens it was Allen's plan to only race at Ironman distances for 2005–2006, with the aim of winning the Ironman World Championships in Hawaii.
After finishing 7th in 2002, Allen placed 5th in both 2005 and 2006.

During the ITU New Plymouth BG Triathlon World Cup in New Zealand in April 2008, Allen had a bike crash at 60 km/h (37 mph) and suffered serious injuries.

At the 2008 Summer Olympics, she ranked 14th.

Achievements:
2002
2nd place, Ironman Austria, Klagenfurt/Austria (08:58:24 hrs. -
fastest Ironman debut in history)
7th place, Ironman Hawaii, Kona/United States (09:38:40 hrs.)

2003
1st place, Ironman Austria, Klagenfurt/Austria (08:54:01 hrs.)

1st place, ITU Triathlon International race, Geneva/Switzerland
2nd place, ITU Triathlon World Cup, Hamburg/Germany
4th place, ITU Triathlon World Cup, Makuhari/Japan
6th place, ITU Triathlon World Cup, Geelong/Australia
Austrian Champion 2003 Triathlon Olympic Distance
Austrian Champion 2003 Triathlon Ironman Distance
2004
Olympic Champion, Athens/Greece
Vice-European Champion, Valencia/Spain
Austrian Sports Personality of the Year
2005
1st place, Ironman Austria, Klagenfurt/Austria (9:07:03 hrs.)

5th place, Ironman Hawaii, Kona/USA (9:22:08 hrs.)

2006
1st place, Vienna City half-marathon (1:14:24 hrs.)

5th place, Ironman Hawaii, Kona/USA (9:30:22 hrs.)

2007
Vice-European Champion, Copenhagen/Denmark
Vice-European Champion Team, Copenhagen/Danmark
3rd place, ITU Triathlon World Cup, Salford/United Kingdom
2008
8th place, World Championships Vancouver/Canada
14th place, Beijing Olympics
After some years of successful racing around Europe with her former coach Mario Huys Allen received Austrian citizenship in 2002 and started racing in the World Cup.
She took silver in only her third World Cup in Hamburg, Germany and won silver at the European Championships in Valencia, Spain.
Just eight years after beginning the sport, Allen won the 2004 Olympic triathlon in Athens. At the end of the swim leg Allen was in 44th place in the field of 51.  After the bicycle leg she was in 28th. During the run she progressively overtook twenty seven competitors to power past then-leader Australian Loretta Harrop just 150 metres from the finish line, winning the race in emphatic style.
Alongside her Olympic distance triathlon career, Allen showed several strong performances in racing at the Ironman distance. In 2002, she recorded the fastest Ironman debut time ever, completing the course in 8:58:24. She topped her performance in 2003, finishing in 8:54:01 hours, a personal record that still stands.
After the Olympic Games in Athens it was Allen's plan to only race at Ironman distances for 2005–2006, with the aim of winning the Ironman World Championships in Hawaii. After finishing 7th in 2002, Allen placed 5th in both 2005 and 2006.
During the ITU New Plymouth BG Triathlon World Cup in New Zealand in April 2008, Allen had a bike crash at 60 km/h (37 mph) and suffered serious injuries.
At the 2008 Summer Olympics, she ranked 14th.
Achievements:
2002
2nd place, Ironman Austria, Klagenfurt/Austria (08:58:24 hrs. - fastest Ironman debut in history)
7th place, Ironman Hawaii, Kona/United States (09:38:40 hrs.)
2003
1st place, Ironman Austria, Klagenfurt/Austria (08:54:01 hrs.)
1st place, ITU Triathlon International race, Geneva/Switzerland
2nd place, ITU Triathlon World Cup, Hamburg/Germany
4th place, ITU Triathlon World Cup, Makuhari/Japan
6th place, ITU Triathlon World Cup, Geelong/Australia
Austrian Champion 2003 Triathlon Olympic Distance
Austrian Champion 2003 Triathlon Ironman Distance
2004
Olympic Champion, Athens/Greece
Vice-European Champion, Valencia/Spain
Austrian Sports Personality of the Year
2005
1st place, Ironman Austria, Klagenfurt/Austria (9:07:03 hrs.)
5th place, Ironman Hawaii, Kona/USA (9:22:08 hrs.)
2006
1st place, Vienna City half-marathon (1:14:24 hrs.)
5th place, Ironman Hawaii, Kona/USA (9:30:22 hrs.)
2007
Vice-European Champion, Copenhagen/Denmark
Vice-European Champion Team, Copenhagen/Danmark
3rd place, ITU Triathlon World Cup, Salford/United Kingdom
2008
8th place, World Championships Vancouver/Canada
14th place, Beijing Olympics
Kate Allen (triathlete)