2021 Monster Energy AMA Supercross Championship
Arlington 1 (West) - 450SX Group B Qualifying 1 Results
AT&T Stadium
Arlington, TX US 
March 13, 2021
450SX Group B Qualifying 1 Results
| Rider | Time | Interval | Best Lap | Hometown | Bike | |
|---|---|---|---|---|---|---|
| 1 |  Brandon Hartranft | 46.9330 | Brick, NJ  | Suzuki RM-Z450 | ||
| 2 |  Fredrik Noren | 46.9670 | Lidköping  | Kawasaki KX450 | ||
| 3 |  Alex Ray | 46.9840 | Jackson, TN | Kawasaki KX450 | ||
| 4 |  Tyler Bowers | 47.0950 | Danville, KY | Kawasaki KX450 | ||
| 5 |  Justin Starling | 47.1240 | Deland, FL | KTM 450 SX-F | ||
| 6 |  Carlen Gardner | 47.3350 | Paso Robles, CA | Honda CRF450R | ||
| 7 |  Cade Clason | 47.4520 | Arcadia, OH | Kawasaki KX450 | ||
| 8 |  AJ Catanzaro | 47.6820 | Portland, CT | Kawasaki KX450 | ||
| 9 |  Nick Schmidt | 47.8250 | Maryville, WA | Husqvarna FC 450 | ||
| 10 |  Kevin Moranz | 48.0020 | Topeka, KS | KTM 450 SX-F | ||
| 11 |  Jeremy Smith | 48.1100 | Marmora, NJ | Kawasaki KX450 | ||
| 12 |  Logan Karnow | 48.3970 | Vermilion, OH | Kawasaki KX450 | ||
| 13 |  Ronnie Stewart | 48.6010 | Easton, PA | GasGas MC 450F | ||
| 14 |  Vann Martin | 48.6570 | Houston, TX | Husqvarna FC 450 | ||
| 15 |  Joan Cros | 48.6600 | Manlleu  | Kawasaki KX450 | ||
| 16 |  Curren Thurman | 48.9120 | Rosharon, TX | Husqvarna FC 450 | ||
| 17 |  Henry Miller | 48.9190 | Rochester, MN | KTM 450 SX-F | ||
| 18 |  Mason Kerr | 49.0460 | Altoona, IA | Kawasaki KX450 | ||
| 19 |  Robert Piazza | 49.4260 | Easton, PA | Kawasaki KX450 | ||
| 20 | Joshua Greco | 49.7680 | Valparaiso, IN | Husqvarna FC 450 | ||
| 21 |  Devin Harriman | 49.8040 | Longview, WA | KTM 350 SX-F |
