The two-time Olympic gold medallist became the first woman to compete with men in the four-man event.
In September, the sport's world governing body announced that it would open the four-man bobsled to women and mixed-gender teams.
Humphries competed with three men in Saturday's race. Previously, women were restricted to a two-person bobsled.
American Elana Meyers Taylor also competed in the event, finishing seventh out of 11 sleds.
Fans responded with pride and encouragement on Twitter.- Can't view on mobile? See tweet here.
- Can't view on mobile? See tweet here.