Actual foot growth (lengthening and or widening) is not a sure bet by any means. Tissue swelling, rather, is more often the culprit in a developing shoe-volume crisis on the trail, especially in hot weather and if you’re dehydrated. But the odds of your feet actually growing in length might increase if:
1 - It’s your first long hike.
2 - You have high arches.
Ultimately, though, you’ll never know for sure until you start walking. That’s the key to all insight in this game. And the more you can get in some quality training miles beforehand, emulating the gear, clothing, and packweight you’ll actually behold come Campo, the more likely you are to adapt (somewhat) in advance and the less likely you are to be surprised by inconveniences related to adaptation in the midst of the journey.
Personally, I think any advice on shoe size is interesting to read for the wide variance of opinions and experience, but utterly worthless for planning purposes. That’s the real take-away here. Everyone has different experiences based on their anatomical and physiological lay of the land. One size does not fit all.
blisterfree