@TS0104
I lived in CO. I’ve made the trek on I-70 many, many times. It is usually a white knuckle drive due to a combination of weather on either/both sides of the Continental Divide, the highway itself, cross-country trucks, traffic, and a few crazy drivers who mistakenly think that 4wd means they can stop on a dime.
Located on the far eastern side of the city, Denver International Airport, is perfectly situated to make for a driver’s nightmare, but you really have to drive if you are staying at Keystone for 4-5 days and want to see the area. There is a bus service, but meh.
1 Due to commuter ski traffic from Denver/Boulder and on the mountains, I prefer western Colorado and other states, but I'll stick to the resorts within 2.5 hours drive of DIA. Skied and boarded Eldora (Boulder's closest local), but not Winter Park, which some local Boulderites swear by. Not including the four Aspen resorts, Steamboat or the western Colorado resorts, because they are more of a hike and not in the area you are headed.
2 Given the above disclaimer, by far, the best resort within 2.5 hours of Denver International Airport is Beaver Creek. A tiny bit farther, than the other Denver/Boulder commutable resorts, but that's why it is better. If out of state, I'd fly into nearby Eagle/Vail and then you don't have to rent a car. There is plenty to do and eat right at the base. I've stayed at BC for days and not wanted to even make the very short drive to Avon. The Beave even limits the number of people on the mountain. It has every challenge from steeps, terrain parks, The Birds of Prey World Cup run, plenty of true blue runs, to green runs on TOP of the mountain. Green runs on top is very rare and great for green run guests to get a full mountain experience rather than at the very bottom in a valley, although those runs are available down below too. BC is very close to the town of Avon and Vail Resort is also close.
Arapahoe Basin and Loveland have the highest base elevation in Colorado, so they get snow earlier in the season and have consistent snow at the bottom. The tradeoff is the local infrastructure and both are often very, very windy and cold.
Keystone is a good locals mountain slowly trying to turn into a destination resort.
Copper - Good on a good day. I encountered fog too often.
Vail - If Sun Valley, Idaho is the best shaped, ski mountain on earth, Vail is amongst the worst from my snowboarder’s perspective, because runs funnel into each other (you will think you are back on I-70) and there is too much gentle, flat and even some up-hill traversing. Vail and Breckenridge are the 2 busiest U.S. ski resorts. Both are massive too.
My second favorite of this bunch is Breckenridge, but only because it is the best town and I know where to snowboard to get away from the crowds. Like Aspen and the prettiest Telluride, Breck was a real mining town, rather than a purpose-built faux Euro resort. The town of Breckenridge has all the amenities and is a keeper, though it gets rather busy too. The green runs are like a table top and extremely crowded, many if not most blues would be called greens everywhere else in the area and again are mostly crowded. However if you are an expert skier or boarder hiking up to the top of Peak 8 (13,000 feet) on a snowy, blustery day makes you feel like Sir Edmund Hillary before you even drop in. Plus, on a blue sky day like this, you can chuckle at people from either coast when they do this.
P.S. This skier is in the Imperial Bowl, not the Lake Chutes.
https://www.youtube.com/watch?v=8nueX6U_Cfs