There are several places to play near Grants Pass.
There is a good field in Gold Hill (which is between GP and Medford) which has pretty good showings of people.
In addition, I am the second in command of a team called Task Force 11 Delta. We usually play on our own, doing milsim training and some games, although we do play at Gold Hill sometimes. We generally play on BLM land. Most of our guys are between 14 and 20, although we do have dads play too. We average 10-20 people most days.
If you would like to send me a PM, I can get you in contact with either option. Both are great, and you would have a good time with either.
"If a man does his best, what else is there?" - George Patton