There are three ways people arrive at a K2 page, and they want different things. This one is the standing reference: how the season and the summit window work, what a permit costs and what the access rules are, the routes in outline, and why the mountain has the reputation it does. Pick your path:

Unlike Everest, which has both a spring and an autumn season, K2 has effectively one realistic window: the Karakoram summer, roughly late June through August. Its northern latitude and fierce microclimate keep the jet stream parked over the summit for most of the year, with winds no climber can survive. For a few weeks in midsummer that wind lifts away in short spells, and the mountain becomes climbable. The true summit window is narrower still, usually a handful of days in late July or early August, when a multi-day break in the weather lines up with the route being fixed to the top. Because there is one route and one window, teams often get compressed into a single mass summit push, which raises crowding at the Bottleneck. That timing pressure is the defining feature of a K2 season.

K2 straddles the border between Pakistan’s Gilgit-Baltistan and China’s Xinjiang, at the head of the Baltoro Glacier in the heart of the Karakoram. Almost all climbing happens from the Pakistan side. Teams fly to Skardu, drive to Askole, then trek roughly a week up the Baltoro past Concordia to K2 Base Camp at about 5,150 m (16,900 ft) on the Godwin-Austen Glacier. There are no roads to Base Camp and no routine helicopter access, which is part of what makes K2 so committing: getting there, and getting out, is a serious undertaking in its own right.

K2 permits are issued by Gilgit-Baltistan, not Pakistan’s central government, and the fee has been contested lately. Authorities proposed replacing the old collective group fee with an individual royalty of $5,000 per climber, but operators challenged the increase and the courts stayed it. In practice the foreign summer royalty has held at about $3,500 per person into 2026, which keeps K2 far cheaper than Everest. The country’s other four 8000ers run about $2,500 each. Fees and rules shift year to year, so confirm the current figure with your operator before you budget.

For the wider permit picture across ranges, see our permits, fees and regulations guide, and for how K2 fits a full expedition budget, the complete K2 climb guide.

We keep the camp-by-camp detail on the pillar pages rather than repeat it here. For the full breakdown, see the complete guide to K2’s routes.

K2 is steeper, more technical, and more exposed than Everest, with no easy line to the top. The crux Bottleneck sits directly beneath a hanging serac, and the section that has claimed the most lives is not the way up but the exhausted, oxygen-depleted descent back through the same terrain, often in deteriorating afternoon weather. Rockfall low on the mountain and avalanche risk higher up round out a serious picture. It is why K2’s historical death-to-summit ratio sits far above Everest’s, and why experienced guides talk about red flags stacking up as a reason to turn around.