@spotiche5- I have a large hydrangea bush on my property, and I usually pick several bouquets each year to dry them to use for crafts. Last year, I totally forgot to pick the hydrangeas before the end of the season, and cold weather had set in before I realized this.
To my surprise, when spring rolled around, I realized that the hydrangeas had become dried quite nicely right on the bush. They also had a nice, pale beige color. I was still able to pick them and used them for my craft projects.
So to answer your question, yes you can dry your hydrangeas without picking them, which will involve very little work on your part.