Another big difference is in the miles that you do every day. On the AT, when I rumbled along at 20 or 25 miles in a day, I got a lot of surprise from other hikers. Sometimes I got lectured about how I was hiking the trail the wrong way. On the PCT, you’ll find 20 miles in a day to be not especially difficult as:
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The trail is actually scenic and you’ll want to see what is over the next rise.
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The trail is built well, with pleasant grades and (generally) smooth tread. It contours a lot when nothing would be gained by going up or down, unlike the AT.
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Distance between water sources can be long, so you tend to hoof it a bit more.
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Distance between resupply points can be long if you don’t like to hitch all the time. The 150 miles or so from Tuolumne to South Lake Tahoe would take 15 days (eek!) at a 10 mpd AT speed.
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It can get really hot, so you tend to hike early and late. Very few hikers sleep in and start hiking at 11.
It isn’t that you hike at a faster rate on the PCT. 3 mph is pretty standard. But, you hike longer. 12, 14, 16 hours of movement. It is pretty easy to rack up miles if you do so. And, you might want to, depending on your tolerance for weather: Hikers this year found WA to be rather unpleasant in September and many did not make it to Manning.
Get in shape before hand to help try to prevent injuries, which can be the biggest problem with the PCT miles.
Suge