Pahto was released by Yakima Chief Ranches as part of a naming initiative using Native American place names for peaks in the Cascade mountain range — Pahto is the Indigenous name for the mountain more commonly known as Mt. Rainier, and the variety carries that dual naming (Pahto, with Mt. Rainier noted alongside it) in most commercial listings. It was bred as a solid, pine-and-spice bittering hop rather than a variety chasing a distinctive fruit-forward aroma.
At 11-14% alpha acid, Pahto functions primarily as a bittering hop, with a pine and spicy aroma that reads closer to the older American high-alpha family (Chinook, Columbus) than to the tropical-fruit-forward proprietary releases of the same general era. That resinous, spicy character makes it a reasonable choice for recipes wanting a more traditional West Coast bittering profile rather than a modern hazy-leaning one. Pahto's alpha range is moderately high and dependable, which the IBU calculator will turn into an actual figure for a Pahto-based charge.
Chinook is the closer substitute for Pahto's pine-and-spice character, sharing a similar resinous American profile at a comparable alpha range. Nugget offers an alternative for the bittering role with less spice presence. American IPA and West Coast-style pale ale both use Pahto as a bittering charge, occasionally extending into a late-boil role. Pahto's alpha range sits inside Nugget's almost exactly, while Columbus runs a wider and generally higher bracket, making Nugget the closer substitute for matching bitterness at the same weight.