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The Pluto with a surface temperature of -235 degree C.But as now a days Pluto being not considered as an authentic planet in our solar system other than a mere KBO (kuiper belt object).The coldest planet status should go to Neptune (-213 degree C) & Uranus (-210 degree C).
Neptune maybe. It is farthest from the Sun.

Actually, perhaps surprisingly, some sources say Uranus is slightly colder than Neptune.

Neptune seems to have an internal heat source.

If you wanted to include "Dwarf Planets", then Pluto or Eris, which is even FARTHER out. We don't really have good temperature information on the trans-Neptunian dwarf planets.

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