Fog didn't lift in our woods until about 11 or 11:30.
Still could see about 70 yds, which is exactly the distance of the buck my daughter shot at around 8:30 (her first buck-needless to say, she was excited)
When the deer was still-couldn't see it at all. Another 20 yds further and we never would have seen it.
I'll tell you one thing, it was a pretty tense and scary drive this morning, visibility in some low areas was literally feet.