| Michael Johnson's efforts: | From | Age | Date | Finish Time |
|---|---|---|---|---|
| Blue Sky Marathon 2019 (Blue Sky) | Colorado, US | 32 | Saturday, October 19, 2019 | Not yet started |
| Never Summer 100k (2019) | Colorado, US | 52 | Saturday, July 27, 2019 | DNF |
| Never Summer 100k (2018) | Colorado, US | 51 | Saturday, July 28, 2018 | DNF |
| Never Summer 100k 2016 | CO | 49 | Saturday, July 23, 2016 | DNF |
| Never Summer 100k 2015 | CO | 48 | Saturday, July 25, 2015 | DNF |