NUE Marathon (100K / 50 Miles) Series
| Race | Date | Location | Limit | Reg. Opens | ||
| 1. True Grit 50 | 13-Mar | Santa Clara, Utah | 1200 | OPEN | ||
| 2. Cohutta Big Frog 65 | 23 April | Ducktown, TN | 500 | 1/15/2021 | ||
| 3. Mohican MTB100K | 21 May | Loudonville, OH | 600 | 1/1/2022 | ||
| 4. Carrabassett 100k | 16-July | Carrabassett Valley, ME | 600 | 2/1/2022 | ||
| 5. Wilderness 101k | 23-July | State College, PA | 400 | 11/15/2021 | ||
| 6. Telluride 50 | 30 July | Telluride CO | 300 | OPEN | ||
| 7. Pierre’s Hole 100k | 6 Aug | Alta, WY | 250 | 2/21/22 | ||
| 8. ShenandoahHarrison, VA | 3-Sept | Harrison, VA | 650 | 11/15/21 | ||
| 9. Marji Gesick 50 | 17-Sept | Ishpheming, MI | 666 | OPEN | ||
| 10 Ring of Fire 100K | 24 Sept | Bend OR | 200 | OPEN | ||
| 11. Grizzly 75K | 8-Oct | Big Bear Lake, CA | 500 | 1/1/2022 |
