This species has a patchy distribution in a small area of about 200 square kilometres around the township of Alexandra, 200–500 m above sea level.
Searches have been carried out on the northern end of the Knobby Range, North Rough Ridge, and the Rock and Pillar Range: all have failed to locate further populations.
Sigaus childi is primarily found on dry, open, sparsely vegetated slopes, usually on north-facing hillsides, but rarely on modified farmland.
Most of these sites appear rocky, mainly due to their low growing and sparse vegetation.

Another more widespread species, S. australis, that lives mostly in subalpine habitat in the mountain ranges nearby, also occurs in this lowland semi-arid habitat.
This brings it into close contact and sympatry with S. childi at some locations.
Genetic data indicate extensive gene flow between these two species.
This species has a patchy distribution in a small area of about 200 square kilometres around the township of Alexandra, 200–500 m above sea level. Searches have been carried out on the northern end of the Knobby Range, North Rough Ridge, and the Rock and Pillar Range: all have failed to locate further populations. Sigaus childi is primarily found on dry, open, sparsely vegetated slopes, usually on north-facing hillsides, but rarely on modified farmland. Most of these sites appear rocky, mainly due to their low growing and sparse vegetation.
Another more widespread species, S. australis, that lives mostly in subalpine habitat in the mountain ranges nearby, also occurs in this lowland semi-arid habitat. This brings it into close contact and sympatry with S. childi at some locations. Genetic data indicate extensive gene flow between these two species.
Sigaus childi