Half Moon is a summit located in Okanogan National Forest, in Okanogan County, of Washington state. The mountain is part of the Methow Mountains, which are a subset of the Cascade Range. Half Moon is situated on Kangaroo Ridge which is approximately two miles east and within view of the North Cascades Highway at Washington Pass. Its nearest higher peak is Wallaby Peak, to the south. Precipitation runoff from the peak drains into Early Winters Creek, and Cedar Creek, both of which are tributaries of the Methow River.