| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 591 | Zuzana HEJNOVÁ |  CZE | 54.55 Q SB | 0.145 | 
| 2 | 904 | Ristananna Tracey |  JAM | 54.80 Q | 0.237 | 
| 3 | 1111 | Joanna LINKIEWICZ |  POL | 55.35 | 0.150 | 
| 4 | 604 | Stina TROEST |  DEN | 56.00 SB | 0.167 | 
| 5 | 1357 | Sydney MCLAUGHLIN-LEVRONE |  USA | 56.22 | 0.196 | 
| 6 | 483 | Noelle MONTCALM |  CAN | 56.28 | 0.222 | 
| 7 | 862 | Ayomide FOLORUNSO |  ITA | 56.37 | 0.183 | 
| 8 | 1284 | Olena Kolesnychenko |  UKR | 56.77 | 0.181 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 1373 | Ashley SPENCER |  USA | 54.87 Q | 0.162 | 
| 2 | 910 | Janieve RUSSELL |  JAM | 54.92 Q | 0.162 | 
| 3 | 701 | Eilidh Doyle |  GBR | 54.99 q | 0.188 | 
| 4 | 1311 | Anna Titimets |  UKR | 55.27 | 0.196 | 
| 5 | 870 | Yadisleidis PEDROSO |  ITA | 55.78 SB | 0.199 | 
| 6 | 1165 | Wenda NEL |  RSA | 55.83 | 0.180 | 
| 7 | 1091 | Emilia Ankiewicz |  POL | 56.99 | 0.133 | 
| 8 | 596 | Denisa Rosolová |  CZE | 57.39 | 0.164 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 1361 | Dalilah MUHAMMAD |  USA | 53.89 Q | 0.158 | 
| 2 | 603 | Sara Slott PETERSEN |  DEN | 54.55 Q | 0.148 | 
| 3 | 896 | Leah NUGENT |  JAM | 54.98 q PB | 0.224 | 
| 4 | 499 | Sage WATSON |  CAN | 55.44 | 0.199 | 
| 5 | 1141 | Grace CLAXTON |  PUR | 55.85 PB | 0.210 | 
| 6 | 1247 | Janeil Bellille |  TTO | 56.06 SB | 0.197 | 
| 7 | 345 | Lauren BODEN |  AUS | 56.83 | 0.134 | 
| 8 | 1312 | Viktoriya TKACHUK |  UKR | 56.87 | 0.192 |