Do yourself a favor... don't run the wood up to the threshold.
Many times I've had customers with existing wood floors call me to look at damage with an eye to fixing it.
Where I typically see problems with wood floors are kitchens, baths, utility rooms, and entries.
Moisture finds its way in at the threshold and typical issues are; delamination, dark streaks (fungal growth), cupping, crinkled finish, and gaps where swelled planks compressed eachother's edges that later dried out.
The typical solution at entries is to cut out the damaged area and replace it with ceramic tile or some other water-resistant flooring.
So, just do it that way from the get-go.