| 03 May 2021 |
Cocodona 250 (250 Miles) |
Rock Springs, Arizona, United States |
| 08 May 2021 |
Quad Rock 50 (25 Miler|50 Miler) |
Fort Collins, Colorado, United States |
| 08 May 2021 |
Yosemite Half Marathon (Half Marathon) |
Yosemite National Park, California, United States |
| 08 May 2021 |
Riverlands 100 (100 Miler) |
Auburn Plains, Maine, United States |
| 08 May 2021 |
Ice Age Trail Endurance Runs (50 Miler|Half Marathon|50k) |
La Grange, Wisconsin, United States |
| 08 May 2021 |
Breakneck Point Trail Runs (42K|21K) |
Beacon, New York, United States |
| 08 May 2021 |
Quicksilver (100K|50K) |
San Jose, California, United States |
| 08 May 2021 |
Thames Path 100 (100 Miles) |
London, England, United Kingdom |
| 08 May 2021 |
McDonald Forest 50k (50k) |
Benton County, Oregon, United States |
| 14 May 2021 |
Devon Coast to Coast (117 Miles) |
South Hams, England, United Kingdom |
| 14 May 2021 |
SAMO 100 Mile (100 Miler) |
Sycamore Cove, California, United States |
| 15-16 May 2021 |
Smith Rock Ascent (15 Miler|50K|4 Miler) |
Terrebonne, Oregon, United States |
| 15 May 2021 |
Ultra-Trail Austrailia (100k|50k) |
Katoomba, New South Wales, Australia |
| 15 May 2021 |
Quest for the Crest Trail Races (50K) |
Burnsville, North Carolina, United States |
| 15 May 2021 |
Keys 100 (100 Miles) |
Newport, Florida, United States |
| 15 May 2021 |
Tyne Trail South (70k) |
Eden, England, United Kingdom |
| 15 May 2021 |
PCT 50 (50 Miler) |
Cleveland National Forest, California, United States |
| 15 May 2021 |
Massanutten Mountain Trails 100 (100 Miler) |
Kings Crossing, Virginia, United States |
| 15 May 2021 |
Mary's Peak Trail Run (25K|50K|50 Miler) |
Blodgett, Oregon, United States |
| 21 May 2021 |
Infinitus (100 Miler) |
Goshen, Vermont, United States |