Here's everything I've got so far... comments/corrections/additions will be added as appropriate:
(updated: 4/18/07)
----California----
MAMMOTH:
"Mammoth does not allow uphill hiking (from Mammoth forums)" -hutash
----Colorado----
ARAPAHOE BASIN:
"You are welcomed to use the area before and after hours permitted you stay within the boundaries while using the area ... During hours, you may also hike/skin/snowshoe up the mountain ... we typically don't permit hiking during early or late season ... [check] with guest services or patrol on the current status ..." (full_text) -ski area rep
ASPEN:
"All of our mountains allow uphilling, both before operating hours and during (except Aspen). At Highlands you are not allowed above the Merry Go Round after 9:00am. On Aspen, you need to be above Ajax Express by 8:00am. At Buttermilk we ask that you use the designated route on the main face. No restrictions at Snowmass." (full_text) -ski area rep
BEAVER CREEK, SKI COOOPER:
"This season I have skinned ... Beaver Creek, Ski Cooper, [and a bunch of others] without a lift ticket and a baby in a backpack" -telemike
BRECKENRIDGE:
Anyone can hike up the mountain at anytime, this is forest service land. The resort has no liability if you do this..." (full_text) -ski area rep
COPPER:
"Yes, we allow people to skin up to the gate on West Ten Mile trail that leads to Janet's Cabin. We also allow people who present their registration letter from the Hut system to ride both Kokomo and Lumberjack lifts to acces the same gate. ... access to the "Closed" ski area during off seaon periods and night time hours is prohibited ... and is in violation of the Colorado Skier Safety Act." (full_text) -ski area rep
CRESTED BUTTE:
"Uphill traffic must be limited to specific trails [see links] ... If participants hear the sound of explosives, it is mandatory to begin descent as soon as possible. Descending trails are the same as ascending routes. All uphill travel must cease by 9:00 A.M." (full_text) (attach1) (attach2) -ski area rep
ELDORA:
"Eldora Mountain Resort does not allow uphill access pre or post operating hours, nor do we allow uphill access during operating hours. ... the entire base area of the resort is "private property" not National Forest Service land therefore accessing the ski area through the base area would technically be trespassing. With that being said we do provide access to the Forest Trail "Jenny Creek" though our base area and beginner hill." (full_text) -ski area rep
STEAMBOAT:
Skiers (and snowshoers) are allowed uphill access. We ask that they stop by the Info Center (in Gondola Square) for a free Uphill Access Pass (... you can download the gondola ... ). (full_text) -ski area rep
WINTER PARK:
"Winter Season: Guests on touring skis can access the mountain as long as they don't try to use the upper mountain lifts. ... If patrol encounters someone at sweep time, we will ask that they proceed to the base ... After we have completed sweep, they may again access the mountain...
Summer Season: Guests ... must stay on trails that are open and designated for hiking.
Off Season: We close the mountain to all guest access. ... The one exception is that the bike trails are accessible for the month of September." (full_text) -ski area rep
VAIL:
"You can go up and down Vail all you want because its a forest service lease. I skin up 2 or 3 days a week just because." -Rippinsick
WOLF CREEK:
"Wolf Creek, co is also forest service land, no restrictions" -rvski
"I thought uphill travel was prohibited since you access it from private land?? I remember seeing signs at the Alberta lift." -homerjay
----Michigan----
BOYNE:
"Boyne will let you during business hours if you have a lift ticket (private property)." -easyrdr
MOUNT BOHEMIA:
"Bohemia is totally off limits as well although the trees provide a nice cover" -easyrdr
----Montana----
BIG MOUNTAIN:
"We just called Big Mountain to find out if they would let us skin to the top with our dog and they said "Sure, just keep him on a leash."." -asheanMT
"big mtn sees alot of uphill traffic. after they close hike to the top, ski the back, hike to the top, ski the front." -cpokwdwh
BRIDGER:
"Bridger doesn't allow skinning up while the lifts are running. If they see you they will tell you to get to the other side of the area boundary rope. I've skied back down inbounds with a dog a couple of times and no one complained, but I'm sure its not allowed. You can skin bridger other times though, and you'll have company." -corn dog
----New Hampshire----
BRETTON WOODS, CANNON:
"My anecdotal experience has been that bretton woods, cannon, ... have been skinner-friendly. Not sure about the "official" policies though..." -backcountryben
GUNSTOCK:
"I skinned up Gunstock this winter ... I was stopped by a patrol, and asked not to go to the summit, only because they were grooming above where she stopped me." -danhikeski
---Oregon---
BACHELOR:
"Bachelor is cool with it." -steepconcrete
MT HOOD MEADOWS, TIMBERLINE, SKI BOWL:
"Mt Hood Meadows, Timberline, and Ski Bowl in Oregon all allow up hill touring whenever (it's FS land)." -ptavv
---Utah---
ALTA:
"feel free to ski" -ski area rep
BRIGHTON:
"Most of our area is Forest Service and you are allowed to use it anytime it does NOT interfer with our work on the hill." -ski area rep
Snowbird:
"... we allow ski touring before and after hours as long as you are not in an Avalanche-Closed area. ..." (full_text) -ski area rep
---Vermont---
KILLINGTON:
"The ski trails are closed to public access outside of our operating hours." (full_text) -ski area rep
"I've personally skinned up killington several times during operating hours on open trails. I've also seen others doing the same." -backcountryben
STOWE, JAY:
"My anecdotal experience has been that ... stowe, and jay have been skinner-friendly. Not sure about the "official" policies though..." -backcountryben
---Washington---
CRYSTAL, ALPENTAL, STEVENS: (where I learned to ski)
"Crystal and Alpental are the same deal [allow up hill touring whenever (it's FS land)]. I think Stevens is as well." -ptavv
"FYI, Crystal Patrol is "not cool with this" according to a response Snoslut rec'd while ascending. I believe they are fine with uphill touring provided you are accessing via the approach to Silver Basin or using alternate routes that access the areas to the looker's left of Silver Basin" -Squirrel99
---West Verginia---
TIMBERLINE, CANAAN VALLEY:
"I and many others have skinned/hiked up Timberline in WV after they close to ski ... I've even called them and asked before, and was told, 'sure, come on up.. no ones gonna bother you'. Im pretty sure the Canaan Valley ski area a few miles away also allows it since its a state park." -JGB
---Wisconsin---
CHRISTIE MOUNTAIN: (where I learned to ski)
"Christie Mt. is not available other than open hours because of liability issues. A lift ticket is required." (full_text) -ski area rep
---Canada---
I realize Canada isn't a state... I might break these up later.
FERNIE:
"Fernie is cool with it as far as I know (cat crew assisted in my journey to the top with dog in tow)" -easyrdr
KICKING HORSE:
"Kicking Horse also was cool with it the two times I did it." -easyrdr
SUNSHINE VILLAGE:
"As we are in a national park we have to by the terms of our lease “allow people to pass freely over the land” ... we sweep the hill every night ... We consider the slopes closed at this time ... We also offer a Backcountry ticket which is good for a gondola ride and one lift to help get folks a head start on their tour." (full text) -ski area rep
"sunshine village didnt seem to mind. they also invited our dogs onto the hill" -mtaylor
Still waiting on responses from: JH, Big Sky, Baker, Beaver Creek, Vail, Alta, Brighton, Park City, Snowbird, Wolf Creek
(I'll try to add/revise as appropriate)
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