How late do the shuttle buses run from Jiuhuang airport?

Generally speaking, the shuttle bus will stop operation after 18:00. But it is hard to tell exactly. I suggest you to call the shuttle bus company at 0837-7243612 for confirming.
If you cannot find the shuttle bus, you can take a taxi to reach Jiuzhaigou directly. The taxi fare is around 200 to 260RMB.
Or you can take the taxi to reach Chuanzhusi and then go to the valley the next day. The taxi fare is around 30 to 40RMB.

Great thanks!