E´ stato Chad Reed a vincere la prima prova del Monster Energy AMA Supercross 2008. Fortunatamente la pioggia ha smesso di cadere ma il fondo era ugualmente scivoloso ed il tracciato si è deteriorato in fretta. Il programma di gara è stato leggermente rivisto con l´annullamento delle batterie di qualifica: due manche (vinte da Reed e Stewart) last chanche e Main Event. James Stewart si è messo nei guai con un errore al via ma ha recuperato fino al secondo posto. A podio anche Tim Ferry. Nella Lite, assente Ryan Villopoto, ha vinto Ryan Dungey.
Risultati 450 Anaheim 1 2008
| 1 | 22 | Chad Reed | Tampa, FL | Yamaha YZ450F | 20 | — | |
| 2 | 7 | James M Stewart | Haines City, FL | Kawasaki KX450F | 20 | 21.474 | |
| 3 | 15 | Timmy M Ferry | Largo, FL | Kawasaki KX450F | 20 | 42.703 | |
| 4 | 8 | Grant Langston | Clermont, FL | Yamaha YZ450F | 20 | 51.36 | |
| 5 | 14 | Kevin W Windham | Centreville, MS | Honda CRF450R | 20 | 56.883 | |
| 6 | 800 | Mike A Alessi | Victorville, CA | Suzuki RM-Z450 | 19 | — | |
| 7 | 118 | David D Millsaps | Tallahassee, FL | Honda CRF450R | 19 | — | |
| 8 | 29 | Andrew T Short | Smithville, TX | Honda CRF450R | 19 | — | |
| 9 | 27 | Nicholas A Wey | Dewitt, MI | KTM 450SX | 19 | — | |
| 10 | 12 | David Vuillemin | Murrieta, CA | Suzuki RM-Z450 | 19 | — | |
| 11 | 25 | Nathan Ramsey | Menifee, CA | Yamaha YZ450F | 19 | — | |
| 12 | 917 | Eric Sorby | Lake Elsinore, CA | Honda CRF450R | 19 | — | |
| 13 | 42 | Paul P Carpenter | Ithaca, NY | Honda CRF450R | 19 | — | |
| 14 | 13 | Heath D Voss | Mico, TX | Honda CRF450R | 19 | — | |
| 15 | 9 | Ivan Tedesco | Tallahassee, FL | Honda CRF450R | 19 | — | |
| 16 | 40 | Joshua R Hill | Yoncalla, OR | Yamaha YZ450F | 19 | — | |
| 17 | 801 | Jeff Alessi | Victorville, CA | Honda CRF450R | 18 | — | |
| 18 | 256 | Bryan K Johnson | Cairo, GA | Honda CRF450R | 18 | — | |
| 19 | 44 | Troy K Adams | Homosassa, FL | Honda CRF450R | 17 | — | |
| 20 | 100 | Joshua Hansen | Murrieta, CA | Yamaha YZ450F | 16 | — | |
| 21 | 43 | Jeff Gibson | Blacklick, OH | Kawasaki KX450F | 16 | — | |
| 22 | 37 | Jason W Thomas | Melrose, FL | Honda CRF450R | 8 | — |
Risultati 250 Anaheim 1 2008
| 1 | 28 | Ryan M Dungey | Belle Plaine, MN | Suzuki RM-Z250 | 15 | — | |
| 2 | 338 | Jason D Lawrence | Carlsbad, CA | Yamaha YZ250F | 15 | 8.251 | |
| 3 | 114 | Justin D Brayton | Murrieta, CA | KTM 250SXF | 15 | 20.328 | |
| 4 | 122 | Daniel James Reardon | Murrieta, CA | Honda CRF250R | 15 | 33.617 | |
| 5 | 51 | Austin L Stroupe | Corona, CA | Kawasaki KX250F | 15 | 35.999 | |
| 6 | 32 | Thomas K Hahn | Alvord, TX | Kawasaki KX250F | 15 | 43.68 | |
| 7 | 273 | Gavin L Gracyk | Blissfield, OH | Honda CRF250R | 15 | 70.452 | |
| 8 | 38 | Andrew Mcfarlane | Menifee, CA | Kawasaki KX250F | 14 | — | |
| 9 | 74 | Chris Blose | Phoenix, AZ | Suzuki RM-Z250 | 14 | — | |
| 10 | 99 | Wil A Hahn | Decatur, TX | Yamaha YZ250F | 14 | — | |
| 11 | 60 | Broc D Hepler | Kittanning, PA | Yamaha YZ250F | 14 | — | |
| 12 | 615 | Jeff S Northrop | Murrieta, CA | Honda CRF250R | 14 | — | |
| 13 | 138 | Michael J Lapaglia | Murrieta, CA | Suzuki RM-Z250 | 14 | — | |
| 14 | 183 | Michael R Blose | Phoenix, AZ | Suzuki RM-Z250 | 14 | — | |
| 15 | 86 | Michael L Willard | Thornville, OH | Honda CRF250R | 14 | — | |
| 16 | 73 | Adam B Chatfield | Cherry Valley, CA | Suzuki RM-Z250 | 14 | — | |
| 17 | 58 | Kyle B Cunningham | Fort Worth, TX | Honda CRF250R | 12 | — | |
| 18 | 52 | Matthew J Lemoine | Pilot Point, TX | Yamaha YZ250F | 11 | — | |
| 19 | 123 | Brett Metcalfe | Murrieta, CA | Kawasaki KX250F | 11 | — | |
| 20 | 410 | Eric J Mccrummen | Oakley, CA | Honda CRF250R | 7 | — | |
| 21 | 56 | Shaun J Skinner | Stuart, FL | Honda CRF250R | 7 | — | |
| 22 | 76 | Zach M Osborne | Abingdon, VA | Yamaha YZ250F | 1 | — |
