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2025-11-12

onX Backcountry Releases 18 New Avalanche Terrain (ATES) Zones, Mapping 15 Million More Acres of U.S. Backcountry Ski Terrain




New zones can be found in Washington, Colorado, Montana, Wyoming, California, Oregon.

onX Backcountry, a navigation and discovery app for outdoor adventurers, today released 18 new Avalanche Terrain Exposure Scale (ATES) zones, expanding ATES coverage across nearly 15 million additional acres of the United States, providing backcountry skiers, splitboarders, fat bikers, nordic skiers and other snowsports enthusiasts with a new way to visualize avalanche terrain in popular backcountry zones.

ATES is a tool that classifies terrain based on potential exposure to avalanches. When toggled on in onX Backcountry, it’s a layer that color codes mountain terrain into five different ratings based on potential avalanche exposure. This cutting-edge tool, in conjunction with local avalanche forecasts, allows users to make more informed decisions and confidently plan their outings.

“As backcountry skiing and snowboarding participation continues to grow, onX is on a mission to equip people with the best possible tools to make smarter decisions. In a sea of ever-changing variables like weather and snowpack, there’s only one variable that remains consistent throughout the season: terrain. By expanding our ATES coverage to some of the most popular terrain across the country, we’re giving skiers and snowboarders one more tool to make better decisions,” onX Backcountry Senior Content Manager and Beacon Guidebook Founder, Andy Sovick, said.

Originally pioneered and developed by Parks Canada in 2003, ATES is a classification that assesses 11 different terrain inputs, including slope angle, starting zones, runout zones, forest density and more. By working in tandem with Alaska-based researcher John Sykes, onX Backcountry is the only digital platform in the United States that provides this tool. Sykes’ algorithm (autoATES) analyzes terrain in popular winter regions in onX Backcountry.



To refine that algorithm, onX works with local avalanche forecasters to test and verify ATES ratings, leveraging their on-the-ground knowledge and historical expertise. This human input is critical to ensure the layer’s accuracy. Furthermore, onX has partnered with the American Avalanche Association (A3), American Institute for Avalanche Research and Education (AIARE) and the American Mountain Guides Association (AMGA) to ensure that ATES is a useful and valuable tool for the backcountry skiing and snowboarding audience.

“We’re regularly reaching out to, and getting feedback from, locals and professionals, tweaking the models accordingly,” Sovick added.

Also included in this year’s expanded ATES coverage is an addition to the ATES scale: “0-Non Avalanche” terrain. Previously, the ATES Scale contained four color-coded levels in ascending order of potential avalanche exposure:

1 – Simple Terrain (Green)

2 – Challenging Terrain (Blue)

3 – Complex Terrain (Red)

4 – Extreme Terrain (Black)

The addition of “0 – Non-Avalanche Terrain” provides users with zero-avalanche-risk areas for various snow pursuits and is color-coded grey in the app.

“This is a bold move, because we are now literally drawing a line on the map, saying ‘you won’t get into an avalanche here.’ This can be extremely helpful for Nordic centers, municipalities, utility companies and ski areas. And of course it’s reassuring for people who want to get outside in the winter, yet want to avoid avalanche terrain at all costs,” Sovick points out.

Heading into the 2025-26 season, onX Backcountry has tripled its ATES coverage, mapping 23 million acres across ten states. New ATES zones in the App, broken down by state, new acres covered and mountain ranges covered, include:

Washington: 3,918,667 New Acres



North Cascades 934,590 acres

Mount Saint Helens and Rainier 1,477,459 acres

Mount Adams 729,853 acres

Leavenworth 776,765 acres



Colorado: 3,676,474 New Acres



Western San Juan Mountains 909,207 acres

Leadville and Aspen 1,651,722 acres

Pikes Peak 176,689 acres

Indian Peaks 374,470 acres

Gore Range, Summit to Steamboat 564,386 acres



Montana: 3,236,578 New Acres



Whitefish 1,114,385 acres

Rattlesnake 360,000 acres

Bitterroots 1,342,193 acres

Seeley Lake 420,000 acres



Wyoming: 2,272,651 New Acres



Togwotee Pass 1,114,621 acres

Alpine and Afton 1,158,030 acres



California: 1,420,011 New Acres



Sonora Pass and Ebbets Pass 581,831 acres

Eastern Sierra 838,180 acres



Oregon: 462,143 New Acres



Central Cascades 462,143 acres



Current ATES coverage areas in onX Backcountry include zones in states above, plus Utah, Alaska, Idaho and more. Comprehensive lists of ATES zones in the app can be found HERE.

To learn more about ATES and to purchase an onX Backcountry subscription or receive a free 7-day trial, visit onxmaps.com/backcountry/app/features/avalanche-terrain-exposure-scale.



The post onX Backcountry Releases 18 New Avalanche Terrain (ATES) Zones, Mapping 15 Million More Acres of U.S. Backcountry Ski Terrain appeared first on SnowBrains.

Ссылка на источник: https://snowbrains.com/onx-backcountry-releases-new-avalanche-terrain-zones/


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