The mountains of Pluto are snowcapped, but not for the same reasons as on Earth

In 2015, the New Horizons space probe discovered spectacular snowcapped mountains on Pluto, which are strikingly similar to mountains on Earth. Such a landscape had never before been observed elsewhere in the Solar System. However, as atmospheric temperatures on our planet decrease at altitude, on Pluto they heat up at altitude as a result of solar radiation.

Source:
https://phys.org/news/2020-10-mountains-pluto-snowcapped-earth.html