Acacia brumalis is a shrub or tree belonging to the genus Acacia and the subgenus Phyllodineae. It is native to an area in the Wheatbelt, Great Southern and the Mid West regions of Western Australia. The dense to open branched shrub or tree typically grows to a height of 1 to 3 metres (3 to 10 ft). It blooms from May to September and produces yellow flowers.