Pronolagus crassicaudatus is found in south-eastern South Africa (provinces of Eastern Cape, KwaZulu-Natal, and Mpumalanga), Swaziland (Lumbobo and highveld regions), southern Mozambique (Maputo Province), and eastern Lesotho (Duthie and Robinson 1990; Boitani et al. 1999; Matthee et al. 2004). It is found from sea level to 1,550 m in elevation (Duthie and Robinson 1990).

Extent of occurrence is greater than 20,000 km², and area of occupancy greater than 2,001 km² (Matthee et al. 2004).