For my first thruhike, I planned extensively, with masses of maildrops, etc. I needed the plan in order figure out how much food to put in each of my boxes. So I did what you did, looked at shelters and campsites and figured an approximate itinerary. Even though I no longer do food drops, I still will plan out my hikes before I go. However, I do it now with some knowledge I didn’t have before I went -
My actual schedule bears little resemblence to my preplanned schedule - it doesn’t have to. I plan conservatively and generally hike faster than my itinerary. That way I never run out of food. I assume short mileage at the beginning, gradually increasing along the way. On most of my hikes I’ve been able to do better mileage than expected. But I also hike to mood, terrain and physical ability rather than to a set schedule. If the day is easy, I’ll hike farther than planned. If the weather is awful or I’m in pain or the terrain is really tough, or alternately, if the weather is beautiful and I spend an hour at a view or swimming in a pond, I’ll hike fewer miles than planned. Often I’ve gone into towns I didn’t expect to visit. It doesn’t matter. I don’t need to prove what a good planner I am, just enjoy my hike. Because I begin by planning conservatively, I don’t have to worry about being behind schedule. The other thing I learned is that on the AT you don’t have to hike from shelter to shelter. There are a lot of places to camp in between. I’d much rather camp than shelter; I sleep much better. So, if I reach a shelter at 3 o’clock, I can get water and keep on hiking until I’m ready to stop. On most of the other long trails there are no shelters, everyone hikes until just before dark. Not being restricted to shelters makes it easier to be ahead of schedule. You’ll soon figure out what kind of pace is comfortable for you. Before you go it can be hard to tell, even with experience or someone telling you where the trail is harder or easier. I knew I would slow down in New England, I had no idea how much I would be forced to slow down by bad knees. But I figured it out before I left town, so I was able to supplement my food boxes.
Ginny