Sat, May 1, 2027 · 8:00 AM · Knoxville, TN
Knox-Xtreme Adventure Race
25MUltra
- Price
- Price on registration site
Ultras in May
Every upcoming Ultra race we know about in May. Where a detail isn't confirmed, we mark it unknown rather than guessing.
Race results
Showing 41+ of 41 races · loading the full list…
Sat, May 1, 2027 · 5:00 AM · Stinson Beach, CA
Miwok 100K Trail Race presented by The North Face
Ultra11,000 ft gain
- Price
- $310-$460
- Field size
- 542 · based on the organizer's entry cap
Sat, May 1, 2027 · 7:45 AM · South Bend, IN
Run Happy 50K (and other happy distances)
10KHalf MarathonMarathonUltra
- Price
- $43.40-$59.30
Sat, May 1, 2027 · 6:00 AM · Winter Park, FL
Sunshine Double (Two Days, Five Distances to choose from)
5K10KHalf MarathonMarathonUltra
- Price
- $32.80-$149.40
Sat, May 1, 2027 · 8:00 AM · Santa Clarita, CA
Santa Clarita Trail Race
1M5K10K15KUltra
- Price
- $75.20-$181.20
Sat, May 1, 2027 · 7:00 AM · Larkspur, CO
Greenland Trail Races
4M8M25KUltra
- Price
- $39.80-$99.20
- Field size
- 185 · based on the organizer's entry cap
Fri, May 7, 2027 · 6:30 PM · Traverse City, MI
Traverse City Trail Running Festival
5K10K25KUltra
- Price
- $39.40-$208.48
Sat, May 8, 2027 · 8:30 AM · Berkeley, CA
Grizzly Peak Trail Run (Postponed until 2028)
2M10KHalf Marathon30KMarathonUltra
- Price
- Free-$96.40
Sat, May 8, 2027 · 7:00 AM · Sharon Hill, PA
Dawn To Dusk To Dawn Track Ultras
UltraCertified course · per organizer
- Price
- $107-$316
- Field size
- 80 · based on the organizer's entry cap
Sat, May 8, 2027 · 8:00 AM · Rockford, MN
Trail Mix Race
6K12.5K25KUltra
- Price
- $30-$70
- Field size
- 290 · basis unavailable
Sat, May 8, 2027 · 7:30 AM · Chattanooga, TN
Scenic City Cyclo
Ultrarolling hills
- Price
- Price on registration site
Sat, May 8, 2027 · 5:45 AM · Des Moines, IA
2027 Market to Market® Relay Iowa
Ultra
- Price
- $726.88-$939.88
Mon, May 10, 2027 · 9:00 AM · Augusta, NJ
3 Days at the Fair
MarathonUltraCertified course · per organizer
- Price
- $160-$657.25
Sat, May 15, 2027 · 10:00 AM · Hueston Woods State Park, OH
Hueston Woods Trail Race
5K10K15KHalf Marathon30KUltraCertified course · per organizer
- Price
- $43.40-$80.50
Sat, May 15, 2027 · 5:00 AM · Portersville, PA
Mighty Moraine Spring Multi-Sport Festival
12.88KHalf Marathon25.75K27.5K28.2KMarathonUltra
- Price
- Price on registration site
Sat, May 15, 2027 · 7:00 AM · Spicewood, TX
Pechanga Trail Run
1M5K10KHalf MarathonMarathonUltra
- Price
- $11.60-$97.46
Sat, May 15, 2027 · 8:00 AM · Waterloo, IA
Death by 5k Waterloo
Ultra
- Price
- $165.30
- Field size
- 191 · based on the organizer's entry cap
Sat, May 15, 2027 · 10:00 AM · College Corner, OH
Mad Maple Trail Races @ Hueston Woods
5K10K15KHalf Marathon30KUltraCertified course · per organizer
- Price
- $48.70-$75.20
Sat, May 15, 2027 · 6:00 AM · Huntsville, AL
In It For The Long Run
5K10KHalf MarathonMarathonUltra
- Price
- $27.50-$107
Sat, May 15, 2027 · 5:30 AM · Key West, FL
KEYS100 Ultramarathon
Ultra
- Price
- $255.40-$1,093
- Field size
- 550 · based on the organizer's entry cap
Sun, May 16, 2027 · 7:00 AM · Thurmond, WV
Highball to Thurmond Ultra & Relay
Ultra6,000 ft gain
- Price
- $108-$187.50
Sat, May 22, 2027 · 7:30 AM · Lenoir City, TN
The Spirit of Kona Triathlons & 5k/10k
5K3.4M10K7.2M16.3M19.4MMarathonUltra
- Price
- $31.74-$37.04
Sat, May 22, 2027 · 8:00 AM · Makanda, IL
Red Cedar Trail Races at Giant City State Park
5K13.6MMarathonUltra1,800 ft gain
- Price
- $17.72-$97.94
Sat, May 22, 2027 · 6:00 AM · Richfield, OH
High Lea 6/12/24 Hour and 100 miler
UltraWalker-friendly · per organizer
- Price
- $64.60-$239.50
Sat, May 22, 2027 · 9:05 AM · Allentown, PA
16th Anniversary Rock N' Run
5K4.97M5MUltra
- Price
- Free-$38.65
- Field size
- 125 · based on the organizer's entry cap
Sun, May 23, 2027 · 8:15 AM · Clayton, CA
Diablo Trail Run
2M4M10MHalf MarathonMarathonUltraflat and fast
- Price
- Free-$96.40
Sat, May 29, 2027 · 10:15 AM · Glen Rose, TX
High Hope Endurance Run 2027 - 200K - 100K - 50K - 25K - 10K - 5K
5K10KUltra
- Price
- Free-$239.50
- Field size
- 45 · based on the organizer's entry cap
Sat, May 29, 2027 · 7:30 AM · Georgetown, TX
River's Edge Trail Race
1M5M10M11M25K22MUltra
- Price
- $15.10-$128.52
- Field size
- 517 · based on the organizer's entry cap
Sat, May 29, 2027 · 7:00 AM · Terre Haute, IN
Hawthorn Half Day Relay & Ultra presented by Jones Fabrication
Ultra
- Price
- $64.60-$107
Sat, May 29, 2027 · 5:00 AM · Winter Park, FL
Winter Park 50K, Marathon, Half, 10K & 5K – MileBuilt Cady Way Bridge Memorial Day 3-Day Challenge
5K10KHalf MarathonMarathonUltra
- Price
- $38.10-$91.10
Sun, May 30, 2027 · 8:15 AM · Oakland, CA
Cinderella Trail Run
2M8KHalf Marathon30KMarathonUltra
- Price
- Free-$96.40
Mon, May 31, 2027 · 5:00 AM · College Grove, TN
Sgt David Hierholzer Memorial Day 50k
Ultra
- Price
- Price on registration site