69%Match
30
JAN
SNOW
Fat Viking
Geilo
150 KMS
800M
All Events
Iditarod Trail Invitational
Difficulty Profile
TERRAIN
HEAT
565km / 1600 km
Distance
Snow
Surface
What to Expect on Iditarod Trail Invitational
The Iditarod Trail Invitational is the world’s longest running winter ultra-marathon.
One of the most challenging experiences on the planet, participants brave extreme physical, environmental and mental challenges as they travel along the historic Iditarod Trail on bicycle, foot or skis. Requiring self-sufficiency and the considerable resilience to make it through up to 30 frozen days and nights, the Iditarod Trail Invitational has built its reputation on notoriously inhospitable conditions and minimal outside support.
Bike Setup for Iditarod Trail Invitational
Bike
Fat Bike
Tires
4.0-5.0" Tubeless
Cassette
10-52T
Chainring
28-30T (1x)
Plan Your Ride
Your Next Challenge
Based on this event's terrain, difficulty and riding style.
43%Match
Past Event
OFF-ROAD
DOOM – LOViT or Leave iT
Hot Springs Arkansas
111MI (~178KM) KMS
9000+FT (~2740M)M
43%Match
Past Event
OFF-ROAD
DOOM – The High Watch
Hot Springs Arkansas
200+MI (~320KM) KMS
16000+FT (~4875M)M
43%Match
Past Event
OFF-ROAD
DOOM – Ouachita Doom
Hot Springs Arkansas
325+MI (~525KM) KMS
32000+FT (~9750M)M
Frequently Asked Questions
How long is Iditarod Trail Invitational?
Riders taking on Iditarod Trail Invitational will cover 565km / 1600 km.
What bike do I need?
A Fat Bike is the right tool for Iditarod Trail Invitational. Set it up with 4.0-5.0" Tubeless rubber and gear it low — a 28-30T (1x) chainring and 10-52T cassette will keep you spinning on the steeper sections.
How difficult is it?
The terrain itself is seriously technical, unforgiving terrain throughout, and conditions tend to run cool.
When does it take place?
Iditarod Trail Invitational runs on February 28, 2027, placing it firmly in the winter riding season, so cold-weather gear and shorter daylight hours are part of the planning.
What surface is it?
Surface-wise, expect snow throughout Iditarod Trail Invitational — 4.0-5.0" Tubeless tires are a safe bet.