| 14 May 2023 |
NJ Ultra Festival (100 Miles) |
Hardwick Center, New Jersey, United States |
| 19 May 2023 |
Infinitus (100 Miler) |
Goshen, Vermont, United States |
| 19 May 2023 |
Cruel Jewel 100 (100 Miler) |
Blairesville, Georgia, United States |
| 20 May 2023 |
North Downs Way 50 (50 Miles) |
Waverley, England, United Kingdom |
| 20 May 2023 |
Yamacraw (20K|50K) |
Stearns, Kentucky, United States |
| 20 May 2023 |
O'Neill Park Trail Races (30K|Half Marathon|10K|50K) |
Trabuco Canyon, California, United States |
| 20 May 2023 |
Massanutten Mountain Trails 100 (100 Miler) |
Kings Crossing, Virginia, United States |
| 20 May 2023 |
Rock N Run Bahia 2023 (5K) |
Bahia De Caraquez, California, United States |
| 20 May 2023 |
Grim Reaper Running Festival (100 Miles) |
South Kesteven, England, United Kingdom |
| 20 May 2023 |
Bishop High Sierra Ultras (50 Miler|55K|100K) |
Bishop, California, United States |
| 20 May 2023 |
Bryce Canyon Ultras (100 Miler|50k|50 Miler) |
Bryce Canyon, Utah, United States |
| 20 May 2023 |
Quest for the Crest Trail Races (50K) |
Burnsville, North Carolina, United States |
| 20 May 2023 |
Sun Mountain (50K) |
Winthrop, Washington, United States |
| 20 May 2023 |
Jemez Mountain (50K|15 Miler|50 Miler) |
Los Alamos, New Mexico, United States |
| 21 May 2023 |
Mountains 2 Beach (Half-Marathon|Marathon) |
Ojai, California, United States |
| 21 May 2023 |
Bear Mountain (12 km|8 km) |
Mission, British Columbia, Canada |
| 25 May 2023 |
Pigtails Challenge (100 Miler) |
King County, Washington, United States |
| 27 May 2023 |
Stumptown Trail Runs (1/2 Marathon|50K) |
Portland, Oregon, United States |
| 27 May 2023 |
Chester Ultra 100 (100 Miles) |
Waverton, England, United Kingdom |
| 27 May 2023 |
Grand Union Canal (145 Miles) |
Birmingham, England, United Kingdom |