- Who
- Tabatha Collins
- What
- 54 total number
- Where
- United States ()
- When
The most ultra marathons run in one year (female) is 54, and was achieved by Tabatha Collins (USA) in various cities around the USA, from 1 January to 31 December 2019.
Tabatha decided to run in honour of her late brother and to raise awareness for mental health issues. She started her attempt on her brother's birthday.