| Event | Rank | Mark | By | Meet |
| | | National Elites above. State Elites below | | |
| B-400 | 1 | 48.61 | Weldon, Hunter (2016) (Albia, IA) | IA 2A State Meet(IA), 2015-05-23(#1) |
| B-400 | 2 | 48.82 | Ontiveros, Will (2016) (Assumption, IA) | IA 3A State Meet(IA), 2015-05-23(#1) |
| B-400 | 3 | 48.85 | Rima, Jalen (2016) (Prairie, IA) | IA 4A State Meet(IA), 2015-05-23(#1) |
| B-400 | 4 | 49.05 | Carroll, Esden (2015) (Algona, IA) | IA 3A State Meet(IA), 2015-05-23(#2) |
| B-400 | 5 | 49.22 | Clough, Eliot (Unattached, IA) | Senior Spotlight Meet(IA), 2015-06-13(#4) |
| B-400 | 6 | 49.26 | Scheelhaase, Nic (2015) (Kingsley-Pierson, IA) | River Valley Invitational(IA), 2015-05-01(#1) |
| B-400 | 7 | 49.45 | Flieder, Austin (Linn-Mar, IA) | Draxton-Stiers/Wilkinson Invitational(IA), 2015-04-11(#1) |
| B-400 | 8 | 49.47 | Foley, Aj (2015) (Urbandale, IA) | IA 4A State Meet(IA), 2015-05-23(#2) |
| B-400 | 9 | 49.50 | Erb, Tyrell (2015) (Carlisle, IA) | IA 3A State Meet(IA), 2015-05-23(#3) |
| B-400 | 10 | 49.55 | Williams, Cameron (2015) (Roosevelt, IA) | AAU JO Region 14 Qualifier(MN), 2015-06-28(#1) |
| B-400 | 11 | 49.70 | Schweizer, Ryan (2016) (Dowling Catholic, IA) | Jim Duncan Invitational(IA), 2015-04-10(#1) |
| B-400 | 12 | 49.73 | Tucker, David (2015) (Storm Lake, IA) | IA 3A State Meet(IA), 2015-05-23(#4) |
| B-400 | 13 | 49.87 | Akers, Landen (2015) (Washington, IA) | IA 4A State Meet(IA), 2015-05-23(#3) |
| B-400 | 14 | 49.91 | Wolfe, Jay (2015) (Creston, IA) | IA 3A State Meet(IA), 2015-05-23(#5) |
| B-400 | 15 | 49.97 | Kasap, Max (2015) (Dowling Catholic, IA) | Jim Duncan Invitational(IA), 2015-04-10(#2) |
| B-400 | 16 | 49.98 | Vogel, Ross (2015) (Waukee, IA) | IA 4A State Meet(IA), 2015-05-23(#4) |
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| | | See more performances for B-400 | | |
