First climbed

In mountaineering, a first ascent (abbreviated to FA in guidebooks) is the first successful, documented attainment of the top of a mountain, or the first to follow a particular climbing route. First mountain ascents are notable because they entail genuine exploration, with greater risks, challenges, and recognition than climbing a route pioneered by others. The person who performs the first ascent is called the first ascensionist.

In free climbing, a first ascent (or first free ascent, abbreviated FFA) of a climbing route is the first successful, documented climb of a route without using equipment such as anchors or ropes for aiding progression or resting.

The details of the first ascents of even many prominent mountains are scanty or unknown; sometimes the only evidence of prior summiting is a cairn, artifacts, or inscriptions at the top. Today, first ascents are generally carefully recorded and usually mentioned in guidebooks.

Overwhelmingly, the idea of a "first ascent" is a modern one, especially in places such as Africa and the Americas with a history of colonialism. There may be little or no physical evidence or documentation about the climbing activities of indigenous peoples living near the mountain. For example, the volcano Llullaillaco on the border of Argentina and Chile is known to have been climbed in the prehistoric period due to the presence of Incan artifacts at the summit, yet credit for the first recorded ascent is given to Chilean climbers Bión González and Juan Harseim, who summited in 1952.

The term is also used when referring to ascents made using a specific technique or taking a specific route, such as via the North Face, without ropes or without oxygen.

In rock climbing, some of the earlier first ascents, particularly for difficult routes, involved a mix of free and aid climbing. As a result, purist free climbers have developed the designation first free ascent (FFA) to acknowledge ascents intentionally made more challenging by using equipment for protection only.

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