CO 200 Trail Race Course
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Hardest Ultramarathons to Get Into

The 30 active ultramarathons with the longest waitlists right now. The number next to each race is how many runners are waiting for a spot — a rough proxy for how competitive the race is to enter. Browse all races →

#1

Javelina Jundred 100M

Sold out WSER Q

October 31, 2026 | Register Now · 100 Miler · McDowell, AZ

594 on waitlist 1042 registered
#2

Javelina Jundred 100K

Sold out

October 31, 2026 | Register Now · 100K · McDowell, AZ

358 on waitlist 516 registered
#3

Crazy Mountain 100

Sold out WSER Q

July 24, 2026 | Register Now · 100 mile · Lennep, MT

269 on waitlist 200 registered
#4

The Bear

Sold out

September 25, 2026 | Register Now · 100 Miler · Logan, UT

180 on waitlist 352 registered
#5

Javelina Jundred Jackass 31K

Sold out

October 31, 2026 | Register Now · Jackass 31K · McDowell, AZ

171 on waitlist 326 registered
#6

Cascade Crest

Sold out WSER Q Hardrock Q

July 17, 2026 | Register Now · 100 Miler · Easton, WA

169 on waitlist 180 registered
#7

Ghost Train Trail Races

Sold out

October 17 - 18, 2026 | Register Now · 30-Hour Ultramarathon · Brookline, NH

165 on waitlist 399 registered
#8

Mountain Lakes 100

Sold out WSER Q

September 19, 2026 | Register Now · 100 Miler · Olallie Lake, OR

160 on waitlist 170 registered
#9

Mammoth Trailfest 50k

Sold out

September 25 - 27, 2026 | Register Now · 50k · Mammoth Lakes, CA

130 on waitlist 972 registered
#10

IMTUF 100 - Idaho Mountain Trail Ultra Festival

Sold out WSER Q Hardrock Q

Idaho Mountain Trail Ultra Festival - September 19 - 20, 2026 | Register Now · 100 Miler · McCall, ID

124 on waitlist 205 registered
#11

Run Rabbit Run 100 Mile Tortoises

Sold out WSER Q Hardrock Q

September 18 - 19, 2026 | Register Now · 100 Mile Tortoises · Steamboat Springs, CO

118 on waitlist 490 registered
#12

Moab 240 Endurance Run

Sold out WSER Q

October 9, 2026 | Register Now · 240 Miler · Moab, UT

117 on waitlist 431 registered
#13

Mammoth Trailfest 26k

Sold out

September 25 - 27, 2026 | Register Now · 26k · Mammoth Lakes, CA

114 on waitlist 993 registered
#14

Mines of Spain 100M

Sold out

October 16, 2026 | Register Now · 100 Miler · Dubuque, IA

80 on waitlist 129 registered
#15

Mines of Spain 100K

Sold out

October 16, 2026 | Register Now · 100K · Dubuque, IA

80 on waitlist 91 registered
#16

Lost Soul Ultra 50K

Sold out

September 11 - 12, 2026 | Register Now · 50K · Lethbridge, AB

78 on waitlist 171 registered
#17

Fat Dog 100k

Sold out

August 7, 2026 | Register Now · 100k · Manning Park, BC

66 on waitlist 219 registered
#18

Lost Soul Ultra 100K

Sold out

September 11 - 12, 2026 | Register Now · 100K · Lethbridge, AB

66 on waitlist 134 registered
#19

Run Rabbit Run 100 Mile Hares

Sold out WSER Q Hardrock Q

September 18 - 19, 2026 | Register Now · 100 Mile Hares · Steamboat Springs, CO

56 on waitlist 121 registered
#20

Long Haul 100

Sold out

January 16, 2027 | Register Now · 100 Miler · Lakeland, FL

51 on waitlist 314 registered
#21

Fat Dog 120M

Sold out WSER Q Hardrock Q

August 7, 2026 | Register Now · 120 Miler · Manning Park, BC

48 on waitlist 186 registered
#22

Mid-State Mile

Sold out

State Mile - June 20, 2026 | Register Now · Last Person Standing · Franklin, TN

48 on waitlist 114 registered
#23

Notchview Ultra 100.7M

Sold out

July 10 - 13, 2026 | Register Now · 100.7 Miles · Windsor, MA

42 on waitlist 33 registered
#24

Notchview Ultra 72Hrs

Sold out

July 10 - 13, 2026 | Register Now · 72Hrs · Windsor, MA

42 on waitlist 88 registered
#25

Notchview Ultra 48hrs

Sold out

July 10 - 13, 2026 | Register Now · 48hrs · Windsor, MA

42 on waitlist 37 registered
#26

Notchview Ultra 12hrs

Sold out

July 10 - 13, 2026 | Register Now · 12hrs · Windsor, MA

42 on waitlist 37 registered
#27

Notchview Ultra 24hrs

Sold out

July 10 - 13, 2026 | Register Now · 24hrs · Windsor, MA

42 on waitlist 28 registered
#28

Notchview Ultra 6hrs

Sold out

July 10 - 13, 2026 | Register Now · 6hrs · Windsor, MA

42 on waitlist 34 registered
#29

Lost Soul Ultra 100M

Sold out WSER Q

September 11 - 12, 2026 | Register Now · 100 Mile · Lethbridge, AB

38 on waitlist 71 registered
#30

Jarmans Invitational Marathon

Sold out

August 1, 2026 | Register Now · 30 Miler · Crozet, VA

35 on waitlist 77 registered