Honnold made history Saturday free soloing El Capitan (left).
A photo on the magazine's website shows a grinning Honnold wearing just a pair of black trousers after reaching the summit.
Honnold is first to climb the iconic rock alone without protection.
After completing the climb, Honnold tweeted.
National Geographic documented Alex Honnold's historic ascent of El Capitan on Saturday, June 3, 2017, saying the 31-year-old completed the "free solo" climb Saturday in almost four hours.
In January 2015, Tommy Caldwell and Kevin Jorgeson became the first to "free climb" the Dawn Wall - a particularly steep route to the top of El Capitan - by grabbing just the rock and using ropes only to catch them if they fell. Freerider features some noteworth pitches; "The Monster Offwidth" - a miserable wide crack that has been known to break people and "The Boulder Problem" pitch which is the crux of the entire route and is essentially one hard move off a tiny handhold. Honnold took a route on El Capitain called Freestyle, which as Uproxx noted, usually takes four days to scale.
He said he started rehearsing the route, climbing it with partners and a rope, and occasionally hiking up to the summit to propel himself down.
It's unclear whether Honnold's sponsor, outdoors outfitters The North Face, knew Honnold was attempting the feat, as according to National Geographic, only a "small circle of friends and fellow climbers" knew of his plan.
Describing his preparations, Honnold said he had expanded his "comfort zone" until he was ready to commit to the route. "But in the years since, I've pushed my comfort zone and made it bigger and bigger until these objectives that seemed totally insane eventually fell within the realm of the possible".
Author Mark M. Synnott reports that Honnold climbed the route in 3 hours, 56 minutes.
It's quite the feat to climb the 3,000-foot El Capitan in Yosemite National Park.
Free Rider was first "discovered' in 1995 by Alexander Huber, then climbed free in 1998 by the German and his brother Thomas Huber".
Honnold grew up in the suburbs of Sacramento where he began practicing indoor rock climbing at age 11. Honnold graduated from Mira Loma High School with a 4.7 GPA and attended the University of California Berkeley to study engineering.