| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 3799 | Zuzana HEJNOVÁ |  CZE | 54.59 Q | 0.155 | 
| 2 | 4323 | Kori CARTER |  USA | 54.92 Q | 0.162 | 
| 3 | 4206 | Wenda NEL |  RSA | 55.70 | 0.205 | 
| 4 | 4351 | Shamier LITTLE |  USA | 55.76 | 0.199 | 
| 5 | 4231 | Petra Fontanive |  SUI | 55.79 | 0.220 | 
| 6 | 4039 | Leah NUGENT |  JAM | 56.19 | 0.230 | 
| 7 | 4179 | Joanna LINKIEWICZ |  POL | 56.25 | 0.225 | 
| 8 | 4265 | Sparkle MCKNIGHT |  TTO | 56.59 | 0.193 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 4047 | Ristananna Tracey |  JAM | 54.79 Q | 0.194 | 
| 2 | 4239 | Lea SPRUNGER |  SUI | 54.82 Q | 0.182 | 
| 3 | 4375 | Cassandra TATE |  USA | 55.31 q | 0.215 | 
| 4 | 3809 | Sara Slott PETERSEN |  DEN | 55.45 | 0.181 | 
| 5 | 4009 | Ayomide FOLORUNSO |  ITA | 56.47 | 0.214 | 
| 6 | 3882 | Meghan BEESLEY |  GBR | 56.61 | 0.196 | 
| 7 | 4218 | Agata ZUPIN |  SLO | 57.05 | 0.205 | 
| 4148 | Glory Onome Nathaniel |  NGR | DQ | 0.212 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | ms* | Reaction Time | 
|---|---|---|---|---|---|---|
| 1 | 4357 | Dalilah MUHAMMAD |  USA | 55.00 Q | 0.181 | |
| 2 | 3746 | Sage WATSON |  CAN | 55.05 Q | 0.176 | |
| 3 | 3888 | Eilidh Doyle |  GBR | 55.33 q | 0.161 | |
| 4 | 4015 | Yadisleidis PEDROSO |  ITA | 55.95 | 0.224 | |
| 5 | 4194 | Grace CLAXTON |  PUR | 56.40 | .396 | 0.216 | 
| 6 | 3805 | Denisa Rosolová |  CZE | 56.40 | .398 | 0.176 | 
| 7 | 4161 | Gianna WOODRUFF |  PAN | 57.32 | 0.200 | |
| 4048 | Ronda WHYTE |  JAM | DQ | 0.149 | 
ms - Milliseconds - shown when two or more competitors finish with the same time down to hundredths of a second