Never bothered to count my list before. Only skied in the USA so far. I started skiing more regularly outside the southeast in 2010. I do ski safaris to satisfy my curiosity about a given region by sampling mountains, large and small. Skied in the northeast when my daughter was in school in Lake Placid or Boston 2013-19. Was curious enough to drive up to Michigan from North Carolina last season to experience midwest skiing using Ikon and Indy.
* - 1 day only
SOUTHEAST (starting 2004) - 10
Sugar
Beech
Cataloochee
Wintergreen
Massanutten (home mountain since 2004-05, on Indy)
Bryce
Snowshoe
Winterplace
Timberline (mostly after Perfect family took ownership)
Canaan Valley
MID-ATLANTIC or CATSKILLS (starting 2013) - 9
Blue Knob (EpicSki/DCSki gatherings 2013, 2016)
Elk
Whitetail
Roundup
Montage
Plattekill
Belleayre
* Hunter
* Windham
MIDWEST (Jan 2024) - 4
Caberfae
Nob's Nob
The Highlands
Boyne Mountain
NORTHEAST - NY, VT, QUE (2013-19) - 12
Whiteface
* St. Sauveur
* Tremblant
Gore
Stowe
* Smuggler's Notch
* Pico
* Sugarbush
* Mad River Glen
Killington
* Stratton
* West Mountain
NORTHEAST - MA, NH, ME (mostly 2017-19) - 13
Mount Sunapee
Loon
Wildcat
Sunday River
Wachusett
Jiminy Peak
Berkshire East
Tenney Mountain
* Attitash
* Bretton Woods
* Cannon
Waterville Valley
* Catamount
WEST - UTAH - 9
Alta (Mar 1970, *Jan 1982, Feb 1994, regularly starting 2008)
Snowbird
Brighton
Solitude
* Sundance
* Park City
Deer Valley
Snowbasin
Powder Mountain
WEST - COLORADO (mostly 2015 or later) - 18
Steamboat (4 days in 1995, 3 days in Feb 2020)
* Howelsen Hill
Arapahoe Basin
Snowmass
Aspen Mtn
Aspen Highlands
* Buttermilk
Telluride
Copper
* Monarch
Wolf Creek (starting 2021, annual Dec trips 2022-24)
* Loveland
Winter Park/Mary Jane
Vail (Dec 2023)
* Beaver Creek (Dec 2023)
* Keystone (Mar 2024)
* Breck (Mar 2024)
Crested Butte (Mar 2024)
WEST - MT, WY, ID, NM - 8
Bridger
Big Sky/Moonlight Basin
Grand Targhee
Jackson Hole
Sun Valley
* Santa Fe
Taos Ski Valley
WEST COAST - 11
Heavenly (Mar 2000)
* Kirkwood (Mar 2000)
Homewood
Alpine Meadows (Mar 2010)
* Sugar Bowl (Mar 2010)
Squaw Valley (Mar 2010; May 2018)
Northstar
Mt. Rose
Bachelor (May 2018)
* Mt. Hood Meadows (May 2018)
Mammoth (May 2018)
More like 2-3 months in NJ, though I’m sure less in New England. And if you look up heat discomfort index, that 95F in the Arizona desert is the same as 85F at 65% humidity (routine on the East Coast) or 83F at 80% (not uncommon).