| 05 May 2018 |
The Northface Endurance Challenge (Marathon|50K|50 Mile) |
Bear Mountain, New York, United States |
| 06 May 2018 |
Volkswagen Prague Marathon (Marathon) |
Prague, PR, Czechia |
| 06 May 2018 |
Verdugo Mountains 10k (10k) |
Glendale, California, United States |
| 12 May 2018 |
Yosemite Half Marathon (Half Marathon) |
Yosemite National Park, California, United States |
| 12 May 2018 |
Quicksilver (100k|50k) |
San Jose, California, United States |
| 12 May 2018 |
Quad Rock 50 (25 Miler|50 Miler) |
Fort Collins, Colorado, United States |
| 12 May 2018 |
Lost Lake (25k|50k) |
Bellingham, Washington, United States |
| 12 May 2018 |
Ice Age Trail Endurance Runs (50 Miler|Half Marathon|50k) |
La Grange, Wisconsin, United States |
| 12 May 2018 |
Smith Rock Ascent (15m|50k|4m) |
Terrebonne, Oregon, United States |
| 18 May 2018 |
Cruel Jewel 100 (100 Miler) |
Blairesville, Georgia, United States |
| 19 May 2018 |
Jemez Mountain (15 Miler|50 Miler|50K) |
Los Alamos, New Mexico, United States |
| 19 May 2018 |
Ultra-Trail Austrailia (50k|100k) |
Katoomba, New South Wales, Australia |
| 19 May 2018 |
PCT 50 (50 Miler) |
Cleveland National Forest, California, United States |
| 19 May 2018 |
Sun Mountain 100K & 50K (50K) |
Winthrop, Washington, United States |
| 19 May 2018 |
Quest for the Crest Trail Races (50 K) |
Burnsville, North Carolina, United States |
| 20 May 2018 |
Ohlone (50K) |
Fremont, California, United States |
| 26-28 May 2018 |
Trail Factor (Half Marathon|50k) |
Portland, Oregon, United States |
| 27 May 2018 |
Mountains 2 Beach (Marathon|Half-Marathon) |
Ojai, California, United States |
| 1-2 Jun 2018 |
Bryce Canyon Ultras (100 Miler|50k|50 Miler) |
Bryce Canyon, Utah, United States |
| 02 Jun 2018 |
Monrovia Canyon Trail Runs (Half Marathon|30k) |
Monrovia, California, United States |