Tumbarumba (/tʌmbəˈrʌmbə/[2] tum-bə-RUM-bə) is a town in New South Wales, Australia, about 480 kilometres (300 mi) southwest of the state capital, Sydney.

Tumbarumba is located on the periphery of the Riverina and South West Slopes regions at the western edge of the Snowy Mountains.

According to the map developed by Tindale, the area that is now Tumbarumba lay at the boundary of the lands of the Wiradjuri and Walgalu peoples.

[9][10] The 21 km final section of the line between Rosewood and Tumbarumba opened as the first rail trail in NSW in April 2020.

[17] Tumbarumba has a temperate oceanic climate (Cfb), with a great seasonal range in maximum temperatures and a pronounced winter rainfall peak.

Snow is fairly common, generally falling on about two days per annum, though is usually light due to the town's valley location.

Another site approximately 25 kilometres (16 mi) to the north-west of Tumbarumba operated from 1938 to 1997, at the Carabost Forest Headquarters.

There is a remarkable warming trend to be observed between the two sites; particularly in the winter months, where Tumbarumba Post Office averages 10.8 °C (51.4 °F) in July maxima, compared to just 9.1 °C (48.4 °F) at Carabost.