This is straight from the USAC website.

2008 USAC SCHEDULE
LUCAS OIL NATIONAL SPRINT CAR SERIES
Date Location Track Type Track D/N Distance
4/5 Rossburg, OH Eldora Speedway 1/2 D N 30 L
4/18 Gas City, IN Gas City I-69 Speedway 1/4 D N 30 L
4/19 Lawrenceburg, IN Lawrenceburg Speedway 1/4 D N 30 L
4/20 Winchester, IN Winchester Speedway 1/2 P D 30 L
5/3 Brownstown, IN Brownstown Speedway 1/4 D N 30 L
5/9 Bloomington, IN Bloomington Speedway 1/4 D N 30 L
5/21 Anderson, IN Anderson Speedway 1/4 P N 100 L
5/31 TBA TBA TBA TBA 30 L
6/3 Bechtelsville, PA Grandview Speedway 1/3 D N 30 L
6/4 Williams Grove, PA Williams Grove Speedway 1/2 D N 30 L
6/5 Minersville, PA Big Diamond Raceway 3/8 D N 30 L
6/7 Hagerstown, MD Hagerstown Speedway 1/2 D N 30 L
6/12 Winchester, IN Winchester Speedway 1/2 P N 30 L
6/13 DeGraff, OH Shady Bowl Speedway 3/10 P N 30 L
6/14 Rossburg, OH Eldora Speedway 1/2 D N 30 L
6/27 Richmond, VA Richmond International Raceway 3/4 P N 60 L
7/9 @Lawrenceburg, IN Lawrenceburg Speedway 1/4 D N 30 L
7/10 @Lawrenceburg, IN Lawrenceburg Speedway 1/4 D N 30 L
7/11 @Gas City, IN Gas City I-69 Speedway 1/4 D N 30 L
7/12 @Gas City, IN Gas City I-69 Speedway 1/4 D N 30 L
7/13 @Kokomo, IN Kokomo Speedway 1/4 D N 30 L
7/17 @Boswell, IN Kamp Motor Speedway 3/8 D N 30 L
7/18 @Bloomington, IN Bloomington Speedway 1/4 D N 30 L
7/19 @Haubstadt, IN Tri-State Speedway 1/4 D N 30 L
8/3 Salem, IN Salem Speedway 1/2 P D 30 L
9/5 Joliet, IL Route 66 Raceway 1/2 D N 30 L
9/20 Rossburg, OH Eldora Speedway 1/2 D N 30 L
9/28 Winchester, IN Winchester Speedway 1/2 P D 30 L
10/31 Perris, CA Perris Auto Speedway 1/2 D N 25 L
11/1 Perris, CA Perris Auto Speedway 1/2 D N 25 L
11/2 Perris, CA Perris Auto Speedway 1/2 D N 40 L
11/8 Phoenix, AZ Manzanita Speedway 1/2 D N 25 L
11/9 Phoenix, AZ Manzanita Speedway 1/2 D N 40 L
@=Indiana Sprint Week