Is Jackson Hole one of them? Is Stowe one of them?
To answer your question 1/yes2/no.
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Is Jackson Hole one of them? Is Stowe one of them?
There are very few resorts in the USA that have a significant amount of terrain at a "40% pitch". 40% is frighteningly steep. As others have said, the Slides at Whiteface are probably that steep. Most major resorts probably have a trail that is in the 40% range for a few turns.
But the "overall steepness" of an area? Every place has terrain that is suitable for any ability level; Whiteface isn't an exception.
Stowe?
Please
the list is something like this
5,133 feet Blackcomb - Whistler, B.C., CAN
4,180 feet Big Sky - Big Sky, Montana
4,139 feet Jackson Hole/Teton Village - Teton Village, Wyoming
4,131 feet
Kicking Horse - Golden, British Columbia, CAN
3,400 Beaver Creek - Avon, Colorado
3,635 feet Aspen Highlands - Aspen Highlands, Colo
3,580 feet Timberline on Mt. Hood - Government Camp, Oregon
3,514 feet Sunshine - Banff, CAN
3,484 feet Steamboat - Steamboat Springs, Colorado
3,365 feet Mt. Bachelor - Bend, Oregon
3,330 feet Vail - Vail, Colorado
3,267 feet Ajax - Aspen, Colorado (hike to also)
3,250 feet-lake Louise - Banff, CAN
3,250 Telluride - Telluride Colorado
3,241 feet Breckenridge - Breckenridge, Colorado
3,240 feet Snowbird (dubious as they are measuring from hike to summits
40% is not very steep. Percent is vertical/horizontal. 100 % = 45 degrees. 40 degrees is very steep. We've had detailed threads in the past here where some posters (Austin and some others) measured pitch with google earth or other resources. Few trails in the east crack 40 degrees, and those that do, do so only for short periods.