| POS | Rank | Heat | BIB | ATHLETE | COUNTRY | RESULTS |
|---|---|---|---|---|---|---|
| 1 | 1 | 2 | FRA | France U20 |
FRA |
43.82 Q WU20L |
| 2 | 2 | 2 | USA | United States U20 |
USA |
44.31 Q SB |
| 3 | 3 | 2 | POL | Poland U20 |
POL |
44.55 q NU20R |
| 4 | 1 | 3 | GER | Germany U20 |
GER |
44.73 Q |
| 5 | 2 | 3 | IRL | Ireland U20 |
IRL |
45.09 Q SB |
| 6 | 1 | 1 | ESP | Spain U20 |
ESP |
45.10 Q NU20R |
| 7 | 3 | 3 | AUS | Australia U20 |
AUS |
45.18 q SB |
| 8 | 4 | 3 | ITA | Italy U20 |
ITA |
45.50 |
| 9 | 4 | 2 | CAN | Canada U20 |
CAN |
45.89 SB |
| 10 | 5 | 2 | THA | Thailand U20 |
THA |
45.89 |
| 11 | 5 | 3 | RSA | South Africa U20 |
RSA |
45.98 SB |
| 12 | 2 | 1 | ECU | Ecuador U20 |
ECU |
46.20 Q SB |
| 1 | NED | Netherlands U20 |
NED |
DNF | ||
| 1 | CZE | Czech Republic U20 |
CZE |
DNF | ||
| 2 | GBR | Great Britain & NI U20 |
GBR |
DNF | ||
| 3 | NZL | New Zealand U20 |
NZL |
DQ R163.3(a) | ||
| 1 | JAM | Jamaica U20 |
JAM |
DQ R163.3(a) | ||
| 1 | TTO | Trinidad and Tobago U20 |
TTO |
DNS |