The most commonly used route ascends Haleakala (Maui) from the beach near Kaupo via the Kaupo and Sliding Sands trails. It's about 20 miles each way, and ascends 10,023 feet.

Another way starts/ends at Kanaha Beach on the north side of the island.  This route stays on roads, and is 38 miles each way.

J Douglas Armstrong described this route:

Wendall Lorenzen posted the route:

Tribal Closures (update July 2022):

When circumnavigating Mt. Adams it is critical to do thorough research on the Yakama Nation Website to check for land closures and to obtain their permit and/or permission before attempting this route.  If the land is closed no one should be on it; we have Flagged prior efforts who were on the tribal land during a time of closure. The tribal land may be closed even when the rest of Mt Adams Wilderness is open.

This is a route along the Olympic Coast that seems logical but has not seen much FKT activity.  Here are some posts from our old website (none of these people identified themselves):

Hello All,

I'm new to this board and poked around a little bit but couldn't find any info on any Olympic Coast runs in WA state.  I pulled off  a 50+ miles in 18 hours along the Olympic Coast in June 2014. From Shi-Shi to Oil City Road, involves beach running, beach head overlands, and timing of the tides... I have GPS documentation and online pre-run announcement.