| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 1875 | Zenéy GELDENHUYS |  RSA | 56.72 Q | 0.201 | 
| 2 | 1631 | Sara GALLEGO |  ESP | 57.18 Q NU20R | 0.183 | 
| 3 | 1657 | Viivi LEHIKOINEN |  FIN | 57.70 SB | 0.157 | 
| 4 | 1619 | Maria Fernanda Matos |  DOM | 57.74 NU20R | 0.146 | 
| 5 | 1723 | Sára MÁTÓ |  HUN | 57.83 NU20R | 0.285 | 
| 6 | 1870 | Iulia Nicoleta Banaga |  ROU | 58.59 PB | 0.172 | 
| 7 | 1712 | Sylvia Schulz |  GER | 58.79 | 0.180 | 
| 8 | 1817 | Gabija GALVYDYTĖ |  LTU | 58.88 NU20R | 0.211 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | ms* | Reaction Time | 
|---|---|---|---|---|---|---|
| 1 | 1773 | Shiann SALMON |  JAM | 56.29 Q | 0.175 | |
| 2 | 1893 | Yasmin GIGER |  SUI | 57.44 Q | 0.160 | |
| 3 | 1849 | Natalia Wosztyl |  POL | 57.68 q PB | 0.225 | |
| 4 | 1977 | Jurnee Woodward |  USA | 58.20 | 0.235 | |
| 5 | 1836 | Solveig Vråle |  NOR | 58.96 | 0.140 | |
| 6 | 1789 | Moeka SEKIMOTO |  JPN | 59.48 | 0.189 | |
| 7 | 1594 | Valeria Cabezas Caracas |  COL | 1:00.53 | .527 | 0.148 | 
| 8 | 1550 | Marlene Santos |  BRA | 1:00.53 | .529 | 0.185 | 
ms - Milliseconds - shown when two or more competitors finish with the same time down to hundredths of a second
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 1909 | Emma ZAPLETALOVÁ |  SVK | 57.22 Q NU20R | 0.000 | 
| 2 | 1562 | Xahria Santiago |  CAN | 57.55 Q | 0.182 | 
| 3 | 1953 | Brooke Jaworski |  USA | 57.57 q PB | 0.197 | 
| 4 | 1658 | Nea Mattila |  FIN | 58.26 PB | 0.253 | 
| 5 | 1551 | Chayenne DA SILVA |  BRA | 59.19 | 0.277 | 
| 6 | 1514 | Jarmillia Murphy-Knight |  AUS | 59.69 | 0.177 | 
| 7 | 1819 | Rūta Okulič-Kazarinaitė |  LTU | 59.83 | 0.187 | 
| 1774 | Sanique Walker |  JAM | DNS |