The height of the stratosphere varies depending on latitude and season, but it generally extends from about 10 kilometers (6.2 miles) to 50 kilometers (31 miles) above the Earth's surface.

Here's a breakdown:

* Lower boundary: The tropopause, which marks the transition between the troposphere and stratosphere, is typically found around 10 km (6.2 mi) at the poles and 17 km (11 mi) at the equator.

* Upper boundary: The stratopause, which separates the stratosphere from the mesosphere, is located around 50 km (31 mi).

It's important to note that the boundaries are not always perfectly defined and can fluctuate.