Yep -- 5'5", and starting SOBO going up Katahdin was eye-opening and even more challenging than I anticipated due to some of the climbing up nearer the top. It's one thing climbing up, when adrenaline and excitement help, but coming back down when your legs are feeling like jelly and you're tired...well, those same spots were a little unnerving. Same at other spots further down the trail, when you have to butt-slide over a little ledge with a full pack and you can't quite see where your foot is going to land and if you're going to snap an ankle.... But other than all that, it's lots of fun!