| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 4357 | Dalilah MUHAMMAD |  USA | 54.59 Q | 0.171 | 
| 2 | 3746 | Sage WATSON |  CAN | 55.06 Q | 0.201 | 
| 3 | 3805 | Denisa Rosolová |  CZE | 55.41 Q SB | 0.167 | 
| 4 | 4265 | Sparkle MCKNIGHT |  TTO | 55.46 Q SB | 0.197 | 
| 5 | 4039 | Leah NUGENT |  JAM | 56.16 q | 0.232 | 
| 6 | 3787 | Zurian HECHAVARRÍA |  CUB | 56.44 | 0.196 | 
| 7 | 3641 | Lauren BODEN |  AUS | 56.49 | 0.161 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 3799 | Zuzana HEJNOVÁ |  CZE | 55.05 Q | 0.152 | 
| 2 | 3809 | Sara Slott PETERSEN |  DEN | 55.23 Q | 0.217 | 
| 3 | 4375 | Cassandra TATE |  USA | 55.48 Q | 0.232 | 
| 4 | 4009 | Ayomide FOLORUNSO |  ITA | 55.65 Q SB | 0.195 | 
| 5 | 4179 | Joanna LINKIEWICZ |  POL | 56.18 q | 0.179 | 
| 6 | 3915 | Jessica TURNER |  GBR | 56.98 | 0.198 | 
| 7 | 4309 | Déborah RODRÍGUEZ |  URU | 57.61 SB | 0.181 | 
| 8 | 4232 | Yasmin GIGER |  SUI | 57.72 | 0.174 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 4047 | Ristananna Tracey |  JAM | 54.92 Q | 0.206 | 
| 2 | 4231 | Petra Fontanive |  SUI | 56.13 Q | 0.195 | 
| 3 | 4351 | Shamier LITTLE |  USA | 56.18 Q | 0.235 | 
| 4 | 4218 | Agata ZUPIN |  SLO | 56.54 Q | 0.239 | 
| 5 | 4293 | Olena Kolesnychenko |  UKR | 56.88 | 0.181 | 
| 6 | 3711 | Aminat JAMAL |  BRN | 57.41 | 0.222 | 
| 7 | 3923 | Jackie Baumann |  GER | 57.59 | 0.255 | 
| 8 | 4258 | Kristina Pronzhenko |  TJK | 1:03.44 | 0.282 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 4323 | Kori CARTER |  USA | 54.99 Q | 0.172 | 
| 2 | 4206 | Wenda NEL |  RSA | 55.47 Q | 0.175 | 
| 3 | 3888 | Eilidh Doyle |  GBR | 55.49 Q | 0.173 | 
| 4 | 4161 | Gianna WOODRUFF |  PAN | 56.50 Q | 0.196 | 
| 5 | 4007 | Marzia CARAVELLI |  ITA | 56.92 | 0.161 | 
| 6 | 4307 | Viktoriya TKACHUK |  UKR | 57.05 | 0.236 | 
| 7 | 3658 | Tia-Adana BELLE |  BAR | 58.82 | 0.245 | 
| 8 | 4115 | Drita ISLAMI |  MKD | 1:00.38 | 0.208 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | ms* | Reaction Time | 
|---|---|---|---|---|---|---|
| 1 | 4239 | Lea SPRUNGER |  SUI | 55.14 Q | 0.180 | |
| 2 | 4048 | Ronda WHYTE |  JAM | 55.18 Q | 0.168 | |
| 3 | 4148 | Glory Onome Nathaniel |  NGR | 55.30 Q PB | 0.178 | |
| 4 | 4194 | Grace CLAXTON |  PUR | 56.35 Q | 0.199 | |
| 5 | 4015 | Yadisleidis PEDROSO |  ITA | 56.41 q | .401 | 0.242 | 
| 6 | 3882 | Meghan BEESLEY |  GBR | 56.41 q | .408 | 0.173 | 
| 7 | 4155 | Amalie IUEL |  NOR | 56.42 | 0.172 | |
| 8 | 3733 | Noelle MONTCALM |  CAN | 57.45 | 0.220 | 
ms - Milliseconds - shown when two or more competitors finish with the same time down to hundredths of a second