| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 3876 | Dalilah MUHAMMAD |  USA | 53.30 Q | 0.186 | 
| 2 | 2513 | Janieve RUSSELL |  JAM | 54.10 Q | 0.151 | 
| 3 | 1176 | Paulien COUCKUYT |  BEL | 54.47 NR | 0.164 | 
| 4 | 2114 | Carolina KRAFZIK |  GER | 54.96 | 0.172 | 
| 5 | 1414 | Sage WATSON |  CAN | 55.51 | 0.163 | 
| 6 | 4015 | Thi Lan QUACH |  VIE | 56.78 | 0.188 | 
| 7 | 2403 | Linda OLIVIERI |  ITA | 57.03 | 0.120 | 
| 8 | 3075 | Amalie IUEL |  NOR | 57.61 | 0.121 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 3870 | Sydney MCLAUGHLIN-LEVRONE |  USA | 53.03 Q | 0.204 | 
| 2 | 3122 | Gianna WOODRUFF |  PAN | 54.22 Q NR | 0.207 | 
| 3 | 3757 | Anna RYZHYKOVA |  UKR | 54.23 q | 0.162 | 
| 4 | 1584 | Zurian HECHAVARRÍA |  CUB | 55.21 | 0.167 | 
| 5 | 3172 | Joanna LINKIEWICZ |  POL | 55.67 | 0.157 | 
| 6 | 3538 | Emma ZAPLETALOVÁ |  SVK | 55.79 | 0.136 | 
| 7 | 3383 | Wenda NEL |  RSA | 56.35 | 0.189 | 
| 8 | 1149 | Tia-Adana BELLE |  BAR | 59.26 | 0.146 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 2987 | Femke BOL |  NED | 53.91 Q | 0.215 | 
| 2 | 3836 | Anna COCKRELL |  USA | 54.17 Q | 0.174 | 
| 3 | 3766 | Viktoriya TKACHUK |  UKR | 54.25 q | 0.224 | 
| 4 | 3516 | Lea SPRUNGER |  SUI | 55.12 | 0.140 | 
| 5 | 2405 | Yadisleidis PEDROSO |  ITA | 55.80 | 0.181 | 
| 6 | 1536 | Melissa GONZALEZ |  COL | 57.47 | 0.191 | 
| 7 | 2028 | Jessica TURNER |  GBR | 1:00.36 | 0.185 | 
| 1659 | Sara Slott PETERSEN |  DEN | DQ | 0.165 |