In mountaineering and climbing, a first ascent (abbreviated to FA in guide books), is the first successful documented climb to the top of a mountain or the top of a particular climbing route. Early 20th-century mountaineers and climbers focused on reaching the tops of iconic mountains (e.g. the eight-thousanders) and climbing routes (e.g. the great north faces of the Alps) by whatever means possible, often using considerable amounts of aid climbing, and/or with large expedition style support teams that laid "siege" to the climb. As all the key tops were summited, the manner in which each top was reached became important, particularly the ability to complete the ascent without artificial aid, which is called free climbing. In free climbing, the term first free ascent (abbreviated FFA) is used where a mountain or climbing route is ascended without any artificial aid (devices for protection in the event of a fall could be used as long as they did not aid progression). Completing the FFA of a climbing route is often called freeing (or more latterly sending) a route. As the sport of climbing developed, additional types of ascent became notable and chronicled in guidebooks and journals. In mountaineering, and alpine climbing in particular, the first winter ascent is recorded, given the significantly greater difficulty. The first solo ascent is also commonly noted, although the first free solo ascent is a more controversial aspect, given the concerns about advocating such a dangerous form of climbing. With the rise in female participation in climbing, the first female free ascent (or FFFA) has also become notable.

In mountaineering and alpinism

As mountaineering developed in the 20th century, the attainment of a summit by almost any means was replaced by ascents that reflected the style used and the conditions faced. In 2008, the most prestigious annual prize in mountaineering, the Piolet d'Or, amended its focus to small light-weight alpine-style teams using no form of aid or support, rather than on large expedition-style teams using "siege" techniques. The most notable types of mountaineering first ascents that are chronicled are:

In rock climbing

In rock climbing, the manner in which the first free ascent was achieved became important to chronicle by climbing journals and magazines. The key differentiators were the style on which the route was free climbed (e.g. traditional climbing, sport climbing, or free solo climbing), whether the free climb was done on the first attempt (e.g. onsighted), and whether the climber had prior information (e.g. beta) on that first attempt. The most notable types of rock climbing first ascents that are chronicled are:

Gender

Notable disputes

There have been notable disputes over claims of a first ascent (or first free ascent), for various reasons (disputes over the style employed, issues with verifiability, accusations of bad faith and fraud), and the most notable are where a new grade milestone and/or major advancement in difficulty is being proposed:

Mountaineering

Rock climbing