The New South Wales colonial government ineffectually prohibited settlement in the area and others outside the Nineteen Counties but livestock herders reached the valley early.

It was one of the last free land grants in the colony of New South Wales and was made only because it had been promised by Governor Darling, in October 1830.

[14] "Coodra Vale", a property of 40,000 acres (16,188 ha) close to Wee Jasper, was the home of pastoralist, Stewart Ryrie, Junior, from 1871 until his death in 1882.

[26] Wee Jasper Post Office first opened in January 1886, closed in March 1892, reopened in 1895 and remained in service until 1994.

[31] Wee Jasper has a temperate oceanic climate (Cfb) in a cold rainforest zone with mild to warm summers and chilly, very wet winters.

Moderate to heavy snowfalls are common through the winter and early spring months, often the result of Northwest cloudbands colliding with cold south-westerly airmasses.

Maximum temperatures are significantly cooler than adjacent regions of similar altitude in the Australian Capital Territory, owing to its windward position on the western slopes of the Brindabella Range.