Do you know which is the last bus from jiuzhaigou to chengdu?

The bus schedules at Goukou Bus Station (one nearby the main entrance of the scenic area) are 06:50, 07:00, 07:30, 07:45, 08:00, 08:20, 08:30, 08:50 and 09:30.
The ticket fare is CNY 140 to 160 per person.

If you wanna hire a private car, it's easy to get one nearby this bus station. The charge is generally CNY2,000-3,000. Remember to negotiate the price before getting in the car. :-)