James Stewart ha dominato la gara di Seattle, vincendo il suo primo titolo AMA SX 450. Secondo posto e primo podio per Davi Millsaps, terzo Kevin Windham. Chad Reed ha avuto qualche problema nel corso del primo giro finendo fuori pista e terminando 6°. Nella Lite Ryan Villopoto confrema di essere il più forte.
Supercross 450
| 1 | 7 | James M Stewart | Haines City, FL | Kawasaki KX450F | 20 | — | |
| 2 | 118 | David D Millsaps | Cairo, GA | Honda CRF450R | 20 | 10.023 | |
| 3 | 14 | Kevin W Windham | Centreville, MS | Honda CRF450R | 20 | 21.283 | |
| 4 | 15 | Timmy M Ferry | Largo, FL | Kawasaki KX450F | 20 | 24.803 | |
| 5 | 29 | Andrew T Short | Smithville, TX | Honda CRF450R | 20 | 33.682 | |
| 6 | 22 | Chad Reed | Tampa, FL | Yamaha YZ450F | 20 | 36.012 | |
| 7 | 26 | Michael Byrne | Newnan, GA | Suzuki RMZ450 | 20 | 47.168 | |
| 8 | 12 | David Vuillemin | Murrieta, CA | Honda CRF450R | 20 | 54.162 | |
| 9 | 36 | Joshua Summey | Stanley, NC | Honda CRF450R | 19 | — | |
| 10 | 40 | Jeff Gibson | Blacklick, OH | Kawasaki KX450F | 19 | — | |
| 11 | 37 | Paul P Carpenter | Ithaca, NY | Kawasaki KX450F | 19 | — | |
| 12 | 8 | Grant Langston | Clermont, FL | Yamaha YZ450F | 19 | — | |
| 13 | 9 | Ivan Tedesco | Murrieta, CA | Suzuki RMZ450 | 19 | — | |
| 14 | 18 | Brock Sellards | Sherrodsville, OH | Honda CRF450R | 19 | — | |
| 15 | 17 | Robbie L Reynard | Oklahoma City, OK | Honda CRF450R | 19 | — | |
| 16 | 115 | Joe Oehlhof | Hesperia, CA | Kawasaki KX450F | 19 | — | |
| 17 | 120 | Kevin W Johnson | Albuquerque, NM | Yamaha YZ450F | 19 | — | |
| 18 | 256 | Bryan K Johnson | Cairo, GA | Honda CRF450R | 19 | — | |
| 19 | 198 | Jacob Saylor | Knoxville, TN | Yamaha YZ450F | 17 | — | |
| 20 | 23 | Kyle Lewis | Henderson, NV | Honda CRF450R | 15 | — |
Supercross 250
1 51 Ryan D Villopoto Poulsbo, WA Kawasaki KX250F 15 — 2 338 Jason D Lawrence Carlsbad, CA Yamaha YZ250F 15 17.17 3 58 Joshua R Hill Yoncalla, OR Yamaha YZ250F 15 22.964 4 73 Jake T Weimer Rupert, ID Honda CRF250R 15 25.789 5 102 Christopher Gosselaar Victorville, CA Kawasaki KX250F 15 31.059 6 138 Michael J Lapaglia Murrieta, CA Yamaha YZ250F 15 38.717 7 34 Troy K Adams Homosassa, FL Suzuki RM-Z250 15 40.468 8 344 Dusty Klatt Campbell River, BC Yamaha YZ250F 15 41.975 9 622 Kyle B Cunningham Springtown, TX Yamaha YZ250F 14 — 10 100 Joshua Hansen Lake Elsinore, CA KTM 250SXF 14 — 11 81 Adam B Chatfield Cherry Valley, CA Yamaha YZ250F 14 — 12 294 Ryan Grantom Tomball, TX Yamaha YZ250F 14 — 13 129 Vernon A Mckiddie Huffman, TX Yamaha YZ250F 14 — 14 916 Gray Davenport Lehi, UT Kawasaki KXF250 14 — 15 84 Michael L Willard Thornville, OH KTM 125SX 14 — 16 556 Jerry Lymburner Fairbanks, AK Yamaha YZ250F 14 — 17 240 Bradley R Graham Rio Rancho, NM Kawasaki KX250F 13 — 18 505 Tyler A Keefe Murrieta, CA Kawasaki KX250F 13 — 19 108 Joaquim Rodrigues Temecula, CA Kawasaki KX250F 12 — 20 24 Joshua M Grant Riverside, CA Honda CRF250R 12 — 21 177 Chris Blose Phoenix, AZ Yamaha YZ250F 11 — 22 630 Matthew J Lemoine Pilot Point, TX Yamaha YZ250F 9 —