In 2009, at age sixteen, Ondra competed for the first time in the Lead Climbing World Cup, finishing ahead of Spanish Patxi Usobiaga and Japanese Sachi Amma.
[18] On October 4, 2012, Ondra redpointed Change in the Hanshelleren Cave, Flatanger Municipality, Norway, the world's first-ever route to receive a grade of 9b+ (5.15c).
[21] On July 9, 2013, Ondra realized the second-ever onsight of a 9a (5.14d) route in history, after Alexander Megos, with the ascent of Cabane au Canada in Rawyl, Switzerland.
[22] On April 23, 2017, Ondra set a new highpoint for Black Diamond's The Project indoor sport route in Stockholm, Sweden, which is believed to be the hardest in the world.
[23] On September 3, 2017, after about 4 years of dedicated work and training, Ondra climbed Silence, in the Hanshelleren Cave in Flatanger Municipality, Norway.
[3] On February 10, 2018, Ondra completed the world's first-ever flash of a confirmed 9a+ (5.15a) route with his ascent of Super Crackinette in Saint-Léger du Ventoux, France.
[24] [25] Youth[26] Adult[26] The table below shows the large number of routes graded 8a (5.13b) or more ascended by Adam Ondra in about 16 years, from August 2, 2002 (when he redpointed his first 8a) to November 10, 2018.