Mount Cumulus is situated on the
Continental Divide along the boundary shared by
Grand County and
Jackson County. It is the fourth-highest peak of the
Never Summer Mountains which are a subrange of the
Rocky Mountains. The mountain is situated on the western boundary of
Rocky Mountain National Park and is visible from
Trail Ridge Road within the park. The west side of the peak is in the
Never Summer Wilderness, on land managed by
Medicine Bow–Routt National Forest. Precipitation
runoff from the mountain's west slope drains into headwaters of the South Fork
Michigan River and the east slope drains into the
Colorado River except a portion which is diverted by the
Grand Ditch. The counterintuitive direction of water flow is because the Continental Divide forms a loop in this area, whereby the peak's west slope runoff flows to the Atlantic Ocean and the east slope to the Pacific.
Topographic relief is significant as the summit rises above the
Kawuneeche Valley in and over above the South Fork Michigan River in . == Etymology ==