As early as possible. We've put up ladder stands in March before green up, gives us an idea of how the woods will look in November, plus with the cooler weather it just seems easier. Then just come back in a few weeks or so before bow season opens to clear some shooting lanes if needed.
“There are two spiritual dangers in not owning a farm. One is the danger of supposing that breakfast comes from the grocery, and the other that heat comes from the furnace.”