NUE Marathon (100K / 50 Miles) Series
| Race | Date | Location | Limit | Reg. Opens | ||
| 1. True Grit 50 | 13-Mar | Santa Clara, Utah | 700 | 9/15/2020 | ||
| 2. Cohutta Big Frog 65 | Canceled | Ducktown, TN | 500 | 7/1/2021 | ||
| 3. Mohican MTB100K | 5-June | Loudonville, OH | 600 | 12/4/2020 | ||
| 4. Carrabassett 100k | 17-July | Carrabassett Valley, ME | 600 | 3/1/2021 | ||
| 5. Wilderness 101k | 24-July | State College, PA | 400 | 2/15/2021 | ||
| 6. Pierre’s Hole 100k | 7-Aug | Alta, WY | 625 | 3/8/2021 | ||
| 7. Big Sky Biggie | 28-Aug | Big Sky, MT | 350 | 1/1/2021 | ||
| 8. Shenandoah | 4-Sept | Harrison, VA | 650 | 2/15/2021 | ||
| 9. Marji Gesick 50 | 18-Sept | Ishpheming, MI | 666 | SOLD OUT | ||
| 10. Grizzly 75K | 25-Sep | Big Bear Lake, CA | 500 | 1/1/2021 |
