Technical alpine
West Buttress — moderate terrain, extreme cold, full self-sufficiency
Real climbing — steep snow/ice or roped rock at altitude.
14–21 days
Restricted / lottery
NPS permit required with a 60-day advance registration deadline and a peak-fee; rangers enforce clean-mountain rules.
Talkeetna
Crowds: medium · most parties climb guided
May–June is the season; by July the lower glacier turns slushy and crevasse bridges weaken. Arctic latitude means summit temperatures below −30 °C even in season.
The West Buttress is technically moderate — cramponed slopes, fixed lines on the headwall, an exposed ridge to high camp — but Denali is an expedition in the fullest sense: you fly onto a glacier, haul sleds between camps, dig in against storms, and operate for weeks in some of the coldest conditions in mountaineering. Altitude bites harder here too; the high latitude makes 6,190 m feel closer to 7,000 m.
America's alpine icon — genuine roped rock climbing to a summit that towers over Jackson Hole.
North America's third summit — a winter-season glacier climb with unbeatable acclimatisation value per dollar.
America's glacier school — the most heavily glaciated peak in the lower 48 and the classic Denali tune-up.