Meridian has some good MC trails from what I hear. I'm anxious to try those out myself. Maybe a few of us could meet there sometime and check it out. I'm in Jackson, MS. I think the guy to contact regarding Meridian is Jerry Corley @ 601-693-4637.
I've heard that Kevin Windham's place has a motocross track plus a few miles of trails. As far as I know, it is open all year. Check the website and see. I need to try that place out also.
I ride in a private club near Magee, MS. We are restoring about 60 miles of trails after the timber company did a little cutting and messed up some of it. As soon as it is ready, you're welcome to come down and ride it. I will warn you that it is fairly tight. You will need bark busters for sure. If you're interested, call me at 800-272-7977, ext. 404.
John