| 18 Mar 2023 |
False Spring Trail Runs (10k|20k) |
Laporte, Indiana, United States |
| 18 Mar 2023 |
Chuckanut 50k (50k) |
Bellingham, Washington, United States |
| 18 Mar 2023 |
Ohio's Backyard Ultra (Last Person Standing - Night Course|Last Person Standing - Day Course) |
Lucasville, Ohio, United States |
| 18 Mar 2023 |
Nine Trails 35 Mile Endurance Run (35 Miler|17 Miler) |
Santa Barbara, California, United States |
| 18 Mar 2023 |
Northburn 100 (100 Miles) |
Pisa Moorings, Auckland, New Zealand |
| 21 Mar 2023 |
Tyger Run/Walk (10km) |
Tyger Valley, Western Cape, South Africa |
| 23 Mar 2023 |
Antelope Island Buffalo Run (100 Miler) |
Syracuse, Utah, United States |
| 24 Mar 2023 |
Greenbrier Ultras (100 Mile Endurance Run) |
Greenbrier, Maryland, United States |
| 25 Mar 2023 |
Blood, Sweat, & Beers (50K|10K|30K|Marathon|1/2 Marathon|5K) |
Boulder City, Nevada, United States |
| 25 Mar 2023 |
Prairie Spirit Trail (100 Miler) |
Ottawa, Kansas, United States |
| 25 Mar 2023 |
Behind the Rocks (50 Miler|30K|50K) |
Moab, Utah, United States |
| 25 Mar 2023 |
VALENCIA Trail Race (50K|10K|Half Marathon) |
Valencia, California, United States |
| 25 Mar 2023 |
Lake Martin 100 (100 Miler|50 Miler) |
Tallapoosa County, Alabama, United States |
| 25 Mar 2023 |
Crown King Scramble (50K) |
Phoenix, Arizona, United States |
| 25 Mar 2023 |
Georgia's Death Race (68 miler) |
Blairsville, Georgia, United States |
| 26 Mar 2023 |
San Diego Half Marathon (Half Marathon) |
San Diego, California, United States |
| 26 Mar 2023 |
White Mountains 100 (100 Miler) |
Fairbanks, Alaska, United States |
| 31 Mar 2023 |
Gorge Waterfalls (50K|100K) |
Cascade Locks, Oregon, United States |
| 31 Mar 2023 |
Badger Mountain Challenge (50 Miler|100 Miler) |
Richland, Washington, United States |
| 01 Apr 2023 |
American River (50 Miler) |
Folsom, California, United States |