| Month |
Race Name |
Events |
Location |
Near |
|
| May |
Capon Valley 50K Run |
50 km |
WV, United States |
Yellow Spring |
|
| May |
Ganaraska Trail Runs |
50 km, 25 km, 12.5 km |
ON, Canada |
Orillia |
|
| May |
Ice Age Trail 50 |
50 mi, 50 km |
WI, United States |
La Grange |
|
| May |
Massanutten Mountain Trails 100 Mile Run |
101.8 mi |
VA, United States |
Front Royal |
|
| May |
Quicksilver 50 Mile, 50K and 25K |
50 mi, 50 km, 25 km |
CA, United States |
San Jose |
|
| May |
XTERRA Malibu Creek Trail Challenge Scramble |
14 mi, 4 mi |
CA, United States |
Calabasas |
|
| May |
Spring Salmon Run |
10 km |
CA, United States |
Nevada City |
|
| May |
Long Island Greenbelt Trail 50K and 25K Runs |
50 km, 25 km |
NY, United States |
Plainview |
|
| May |
Silver State 50/50 Endurance Run |
50 mi, 50 km, 13.1 mi |
NV, United States |
Reno |
|
| May |
Watershed Preserve 12-Hour Trail Race |
26.2 mi |
WA, United States |
Redmond |
|
| May |
Forest Park Trail Run 10km, 20km & 50km |
50 km, 20 km, 10 km |
OR, United States |
Portland |
|
| May |
Wyoming Marathon Races |
52.4 mi, 26.2 mi, 13.1 mi, 5 km |
WY, United States |
Laramie |
|
| May |
Pilot Hill 25K Classic |
25 km |
WY, United States |
Laramie |
|
| May |
Big Basin Redwoods Trail Run |
50 km, 25 km, 17 km, 9 km |
CA, United States |
Boulder Creek |
|
| May |
Dandelion Run |
10 km, 5 km |
OH, United States |
Dover |
|
| May |
McDonald Forest Cross Country Race |
50 km, 15 km |
OR, United States |
Corvallis |
|
| May |
Sky Mesa Pass Trail Marathon |
26.2 mi |
CO, United States |
Grand Junction |
|
| May |
Muddy Marathon with QM, HM option |
26.2 mi, 13.1 mi, 6.6 mi |
NJ, United States |
Rockaway NJ |
|
| May |
Trail Trial 10k |
10 km, 10 km |
VA, United States |
Charlottesville |
|
| May |
Fat Tire Trail Challenge - Black Hills Trail Series |
4 mi |
SD, United States |
Rapid City |
|
| May |
Alkali Creek Trail Race |
8 mi |
SD, United States |
Sturgis |
|
| May |
The Ironmaster's Challenge |
26.6 mi, 9.7 mi |
PA, United States |
Gardners |
|
| May |
Scenic City Trail Marathon |
26.2 mi |
TN, United States |
Chattanooga |
|
| May |
Sehgahunda Trail Marathon & Relay |
26.2 mi |
NY, United States |
Mt. Morris |
|
| May |
The Sage Burner |
50 km, 25 km |
CO, United States |
Gunnison |
|
| May |
Hellyer Half Marathon/10K/5K |
13.1 mi, 10 km, 5 km |
CA, United States |
San Jose |
|
| May |
OBX Ultramarathon |
50 km |
NC, United States |
Corolla |
|
| May |
Greenland Trail 50K, 25K, 8M |
50 km, 25 km, 8 mi |
CO, United States |
Larkspur |
|
