Greetings. Does anyone know if a Spintir planet sheet exists?

I'm guessing if it does it may be fan made.

I'm running Mountaintop Rescue and assuming my PC's will stick around Spintir after the adventure.

A planet sheet would be really nice to give my players. Thanks in advance!

Not exactly, but the free download follow-up to Mountaintop Rescue does have more about the planet. There's a "Spintir Gazeteer" near the beginning that has some of the kind of information you'd find on the planet sheets. More in depth on some things, but less inclusive.

https://images-cdn.fantasyflightgames.com/filer_public/74/9f/749fc12b-fd71-489f-aee9-cf8b23b03e60/swfp01_lure_of_the_lost_lr.pdf