Cirrus clouds are the highest of the three main cloud types, typically found between 5,000 and 13,000 meters (16,400 and 42,600 feet).

However, it's important to note:

* Cirrus clouds can reach even higher altitudes, sometimes up to 18,000 meters (59,000 feet).

* The specific altitude can vary based on location and other factors. For example, cirrus clouds in tropical regions tend to be higher than those in polar regions.

Let me know if you have any more questions about clouds!