Top Ten female

August 23, 2017
A mother will do anything for

Given there are plenty of annual lists at this time of year for best performances and runners, it got me thinking about the very best ultra performances of all time. Obviously it's impossible to have some perfect formula to compare every aspect of one performance to another, but I used my own experience from road, track and trail racing (as well as coaching elite women) to consider the most impressive female runs ever and have included the equivalent list for men here.

I factor in the level of competition on the day, the level of competition that's attempted the world or course record at any point in history, weather (where applicable, like at Western States where it can vary significantly) and knowledge of the tactics and skill used to get such a great performance. I was lucky enough to see some of these performances in person or at least meet most of the runners mentioned below.

I include only one performance per race, unless the race has more than one format or direction (like Comrades with its Up and Down runs or the clockwise/anti-clockwise directions at Hardrock 100). Also, how well these records stand the test of time is important, so a very well-challenged record from longer ago is deemed to be especially impressive.

I also work off the assumption that if a runner hasn't been caught doping then their results are legitimate, since unfounded accusations are spiteful. Anyone who is a confirmed doper is not part of this list (that I'm aware of).

No photo available of Tomoe Abe - anyone got one?

1. Tomoe Abe, Japan - 100k World Record at Lake Saroma, Japan (6:33:11, 2000)
She set the fastest 100k time for women by a long margin (nobody else has broken 7hrs and Ann Trason is one of the closest with a 7:00:47 best). I've heard that this record was set with a tailwind, but it's still so far ahead of any of the other road or track marks set by women at any ultra distance that it really stands out. To give an idea of Abe's caliber, she won the bronze medal in the marathon at the 1993 World Championships and her personal best time is 2:26:09. In addition, she ran a 2:28:01 in the same year as her 100k record and a 2:27:01 the following year so was very much at her peak at that point. This is equivalent to 5:16 for 50 miles (compared to the 5:40 world record by Ann Trason), or even quicker if she slowed towards the end of the 100k. Also, this record is surprisingly close to the men's record

Frith van der Merle. Photo:

2. Frith van der Merwe, South Africa - Comrades Down Run Course Record (5:54:43, 1989)

van der Merwe destroyed the Comrades down run record in 1989 and nobody's come very close since, with just two other women breaking 6hrs - Ann Trason with a 5:58:24 in 1997 and Tatyana Zhirkova with 5:58:50 in 2005. van der Merwe's average pace was 6:23/mile, working out as around 5:19:30 through 50 miles with hills. The down run is usually won in a time around 6:10:00 and the record looks safe for the moment.

However, the up run course record of 6:09:24 (Elena Nurgalieva, 2006) isn't quite as comparably fast and doesn't make the top 10 list. It's 15 mins off the down run record while the men's up run record is only four minutes slower than the down run record (see the top 10 all time ultra men's list).

Rory Bosio. Photo: Tim Kemple

3. Rory Bosio, USA - UTMB Course Record (22:37:26, 2013)

The top ranked trail performance is by Rory Bosio, who decimated the Ultra-Trail du Mont Blanc field two years in a row (2013 and 2014 wins), taking over two hours off the course record and finishing seventh overall in 22:37:26, well ahead of the female competition. On top of that she made it look easy, smiling and playing in the mountains throughout the race. This is arguably the most competitive trail ultra in the world and Rory was so dominant that this could easily have been number one in the list.

Ann Trason. Photo: Running Times
4. Ann Trason, USA - Grand Slam of Ultra Running Record (79:23:21, 1998)

No woman dominated ultra running like Ann Trason. 14 wins at Western States 100, including the former course record, plus wins at Comrades, the 100k World Cup and just about every major ultra you can think of in the 1990s. She also holds American and World Records at numerous distances, most of which still stand today. She generally raced the men since no women could keep up with her and the fact she has several spots in this top 10 reflects that her times are just as competitive today.

However, I judge the top-rated performance of her career as her Grand Slam of Ultra Running record, the combined time for the Western States 100, Vermont Trail 100, Leadville Trail 100 and Wasatch Front 100, all over one summer in a period of 10-11 weeks. The next best female time was nine hours back by Krissy Moehl! Ann was the female winner in each of those races, which wasn't unexpected for such a talented runner, but it speaks to her ability to not just perform well for a single target race but to manage so many other factors within ultra running to stay strong and fast through each of these races. If there was an award for the best female ultra runner of all time, it would be hard to argue against Ann as the clear winner, especially with her breadth of dominance.

Anna Frost. Photo:

5. Anna Frost, New Zealand - Transvulcania Course Record (8:10:41, 2014)

Anna's had numerous spectacular performances and is undoubtedly one of the best female mountain runners of all time. Her course record at the hyper competitive Transvulcania ultra on the island of La Palma in the Canary Islands is something that stands out. When Anna's on top form she's like a steam train uphill and most of the very fastest mountain women of the modern era have tackled this course and not come close to this time. Only Anna herself (8:11:31 in 2012) and Skyrunning star, Emelie Forsberg (8:13:22 in 2013), have come close to this performance.

Ellie Greenwood. Photo: irunfar

6. Ellie Greenwood, Great Britain/Canada - Western States 100 Course Record (16:47:19, 2012)
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