| 17 May 2025 |
Massanutten Mountain Trails 100 (100 Miler) |
Kings Crossing, Virginia, United States |
| 17 May 2025 |
Quest for the Crest Trail Races (50K) |
Burnsville, North Carolina, United States |
| 17 May 2025 |
North Downs Way 50 (50 Miles) |
Waverley, England, United Kingdom |
| 17 May 2025 |
Ram Party (24K |50 Mile|50K|16K|33K|5K) |
Colorado Springs, Colorado, United States |
| 17 May 2025 |
O'Neill Park Trail Races (30k|Half Marathon|10k|50k|Marathon) |
Trabuco Canyon, California, United States |
| 17 May 2025 |
Bishop High Sierra Ultras (50 Miler|55K|100K) |
Bishop, California, United States |
| 17 May 2025 |
Sun Mountain (50K) |
Winthrop, Washington, United States |
| 17 May 2025 |
Dances with Dirt Gnaw Bone (13.1M|10K|50K|26.2M|50M) |
Nashville, Indiana, United States |
| 17 May 2025 |
Yamacraw (20K|50K) |
Stearns, Kentucky, United States |
| 18 May 2025 |
Cruel Jewel 100 (100 Miler) |
Blairesville, Georgia, United States |
| 18 May 2025 |
NJ Ultra Festival (100 Miles) |
Hardwick Center, New Jersey, United States |
| 18 May 2025 |
Bay of Islands Run Walk Festival (Half Marathon|Trek Trail & Fish 50km Ultra Marathon|8.7km|Hotprintz 6km Walk) |
Paihia, Northland, New Zealand |
| 18 May 2025 |
Seaside Marathon (Marathon|5K|Half|10K) |
Sea Cliff, California, United States |
| 23 May 2025 |
Nanny Goat 100 (100 Miler) |
Riverside, California, United States |
| 23 May 2025 |
Grand Union Canal (145 Miles) |
Birmingham, England, United Kingdom |
| 24 May 2025 |
Stumptown Trail Runs (1/2 Marathon|50K) |
Portland, Oregon, United States |
| 24 May 2025 |
Zegama-Aizkorri (Marathon) |
Zegama, Basque Country, Spain |
| 24 May 2025 |
Pigtails Challenge (100 Miler) |
King County, Washington, United States |
| 25 May 2025 |
Calgary Marathon (5K|10K|50K|Half Marathon|Kid's Run|Marathon) |
Calgary, Alberta, Canada |
| 25 May 2025 |
Sunshine City Festival Half Marathon (21.1km|10km|5km) |
Harare, Harare, Zimbabwe |