Few ski guides know the peaks and lines of Washington’s Snoqualmie Pass region like longtime local Trevor Kostanich. That hometown knowledge, earned during decades ski instructing, ski guiding and co-authoring Washington’s Backcountry Ski & Snowboard Routes, enables the resident AMGA certified ski guide to unlock a backcountry gateway to the complex terrain and magical valleys of an often-overlooked ski touring paradise less than an hour from Seattle’s urban core.

In the second season, when access opens, skies clear, and corn snow forms, Trevor shifts his operational focus to the deep snowpacks and glaciated terrain of the North Cascades. Enabling clients to experience volcano summit skis and high route traverses, his guided offerings include ski mountaineering trips up Mt Baker’s north side, multi-day traverses in North Cascades National Park, and wild descents off Glacier Peak. 

​Trevor’s extensive high route and big mountain experience also includes pioneering the first continuous ski traverse from Snoqualmie Pass to (almost) Canada with Forest McBrian. ​The wealth of adventure skiing passion and expertise that drove that 34-day aesthetic high route makes his one-man, two skis operation a trusted choice for Seattle-area backcountry riders looking to tour local or head north to bucket list touring destinations such as Whistler’s Journeyman Lodge, the Selkirk Huts or Alaska’s Thompson Pass.

​Rooted in a commitment to progression and outcomes rather than objectives, Trevor aims to empower memorable backcountry days, whether tracking deep powder, navigating technical couloirs, or perfecting new skills in high mountain terrain. Long an accomplished guide on the Pro Guiding Service roster, Trevor has shifted his trailbreaking to full independent status. Trevor Kostanich Ski Guide is a proud member of 1% For the Planet.