The most popular and easiest climbing route is from the south and east, via the Inspiration Glacier and a moderately steep snow ridge.

Eldorado is a popular climbing destination due to easy access, being one of the 100 highest peaks in Washington, and superb mountain views.

[5][6][7] Eldorado is very simple geologically when compared to other mountains in the Cascades, with only one major rock type, Cretaceous orthogneiss, more specifically biotite granodiorite.

As a result, the west side of the North Cascades experiences high precipitation, especially during the winter months in the form of snowfall.

[9] Due to its temperate climate and proximity to the Pacific Ocean, areas west of the Cascade Crest very rarely experience temperatures below 0 °F (−18 °C) or above 80 °F (27 °C).