- 1998 Mazda Truck Motocross Champions: Doug Henry & Ricky Carmichael
- 1998 AMA Supercross Champion: Jeremy McGrath
- Motocross results
- Supercross results
1998 AMA U.S. Open of Supercross results
Oct. 10 - Oct.11 -- The MGM Grand Garden Arena, Las Vegas, NV
1998 AMA/Mazda Truck Motocross Nationals Results
Sept.
6 -- Steel City Raceway, Delmont, PA
Aug.
30 -- Broome-Tioga Sports Center, Binghamton, NY
Aug.
16 -- Spring Creek Motocross Park, Millville, MN
Aug.
2 -- Washougal Motocross Park, Washougal, WA
July
26 -- Kenworthy's Motocross Park, Troy, OH
July
19 -- Unadilla Valley Sports Center, New Berlin,
NY
July
5 -- Red Bud Track-N-Trail, Buchanan, MI
June
21 -- Budds Creek Motocross Park, Budds Creek,
MD
June
14 -- Motocross 338, Southwick, MA
May
24 -- High Point Raceway, Mt. Morris, PA
May
17 -- Prairie City SVRA Park, Sacramento, CA
May
10 -- Glen Helen Raceway Park, San Bernardino, CA
1998 AMA Supercross
Series Results
May
2 -- Sam Boyd Stadium, Las Vegas,
NV (125 Shoot-out)
April
25 -- Texas Stadium, Irving,
TX (125 West)
April
18 -- Charlotte Motor Speedway, Charlotte,
NC (125 East)
April
4 -- Pontiac Silverdome, Pontiac,
MI (125 East)
March
28 -- Trans World Dome, St. Louis,
MO (125 East)
March
21 -- HHH Metrodome, Minneapolis,
MN (125 West)
March
14 -- The Louisiana Superdome, New Orleans,
LA (125 East)
March
7 -- Daytona Int'l Speedway, Daytona Beach,
FL (125 East)
Feb.
28 -- Houlihan's Stadium, Tampa,
FL (125 East)
Feb.
21 -- Georgia Dome, Atlanta,
GA (125
East)
Feb.
14 -- RCA Dome, Indianapolis,
IN (125 East)
Feb.
7 -- Qualcomm Stadium, San Diego,
CA (125 West)
Jan.
31 -- Seattle Kingdome, Seattle,
WA (125 West)
Jan.
24 -- Sun Devil Stadium, Tempe,
AZ (125 West)
Jan.
17 -- Houston Astrodome, Houston,
TX (125 West)
Jan.
10 -- LA Coliseum, Los Angeles,
CA (125 West)