Key takeaways
- An FKT is the fastest documented time on a defined route, set outside an organized race.
- Three support styles: supported (aid/crew), self-supported (own caches/resupply), unsupported (carry everything, no help).
- FKTs rely on honesty and documentation — typically a GPS track and trip report.
- They let anyone race the clock on iconic routes without a formal event.
Fastest Known Time.
What an FKT is
An FKT — Fastest Known Time — is the fastest documented time for traveling a specific established route, set outside of an organized race. Pick a route with an existing FKT (or establish one on a new route), try to beat it, and document your effort. It’s a grassroots, do-it-yourself alternative to racing that has surged in popularity in trail running and mountain endurance.
The three support styles
- Supported — you receive aid and a crew along the way.
- Self-supported — you use only resources you cached yourself or buy publicly; no personal help.
- Unsupported — you carry everything start to finish with no help or caches.
Each is tracked separately, because they’re very different challenges.
A runner attempts the unsupported FKT on a long trail — carrying all their food and gear from the start, accepting no help — then submits a complete GPS track, photos, and a detailed trip report to the FKT community database for scrutiny.
The ethic and verification
FKTs rely on honesty and documentation, not official timing: a GPS track of the whole effort, photos, and a trip report, validated by community standards. It lets anyone race the clock on iconic routes — from a local loop to a thru-hike trail — and is a natural extension of ultrarunning.
The bottom line
An FKT is racing the clock, not other people — the fastest documented time on a defined route, set on your own outside any organized event. Categorized by support style (supported, self-supported, unsupported) and validated by honest documentation like GPS tracks, FKTs have given trail runners and mountain athletes a way to chase records on the world's iconic routes, anytime.
Frequently asked questions
What is an FKT?
An FKT, or Fastest Known Time, is the fastest documented time for completing a specific established route — a trail, peak, or traverse — done outside of an organized race. It's a self-directed challenge: you pick a route with an existing FKT (or establish one), attempt to beat it, and document your effort. It's hugely popular in trail running and mountain endurance sports.
What are the FKT support styles?
There are three: 'supported' (you receive aid, such as a crew handing you food and gear along the way), 'self-supported' (you can use resources you cached yourself or buy publicly available supplies, but get no personal help), and 'unsupported' (you carry everything from start to finish and receive no help or caches at all). Each is tracked separately, since they're very different challenges.
How are FKTs verified?
FKTs rely on honesty and documentation rather than official timing. Attempters typically record a GPS track of their entire effort, take photos, write a detailed trip report, and submit it to a community database. The trail-running community and the FKT website maintain standards and scrutinize submissions, so credibility depends on transparent evidence.
Sources
- FKT guidelines & community — Fastest Known Time
- Trail running & endurance — American Trail Running Association