I originally thought this would be nearly impossible to pull off, but the more I look at it, the more "reasonable" it seems. People have hiked the triple crown

I originally thought this would be nearly impossible to pull off, but the more I look at it, the more "reasonable" it seems. People have hiked the triple crown in a year and this would probably be a lot easier. It looks like the AT meets up with the GART at Harper's Ferry, which is about the halfway point of the AT. Then the GART meets up with the PCT at Snoqualmie Pass, which is pretty close to the northern end of the trail. You'd have to time it all around snow melting in the Cascades and trying to get to Snoqualmie Pass around the beginning of July. A reasonable schedule (for a decently fit thru-hiker) would be to start March 1st on the AT and make it to Harper's Ferry by the end of April. Then you hop on the GART and take 3 months to walk across the ~3000 miles to meet up with the PCT at Snoqualmie pass. The 35ish miles per day would be a lot, but very doable on railroad grades and roads. If you make it to Snoqualmie Pass by July 1st you're right in the heart of the main southbound PCT thru-hiker season. Also, if you're the kind of hiker that attempted something like this, you'd probably do the AT and PCT sections a bit faster than the timeline I presented, giving you even more time for the GART.