Best Time To Ski Keystone For Smaller Crowds: We advise most people to steer clear of Epic Pass resorts on the I-70 corridor on Saturdays. This holds true for Keystone as well, although it's usually a better bet than is Breckenridge on Saturdays. Denver area skiers tend to flood the area on Saturdays and clog the mountain up, especially at Keystone and Breck where locals aren't subjected to blackout days on their passes as they are at Vail and Beaver Creek. If you're vacationing at Keystone and will be there over a Saturday, it's a fine time to check out A-Basin or, even better, Loveland, where the crowds are sparse, the snow is cold and the terrain sneaky good.
Keystone's crowds outside of Saturdays tend to be mild in late March, and throughout January into mid February.
Cheapest Time To Ski Keystone: Keysone is the most affordable ski resort on the Epic Pass in central Colorado. The lodging is cheaper, the parking is free or cheap and even the eats are cheaper than comparable stays at Vail, Beaver Creek or Breckenridge. It's a great spot for families trying to make a Colorado ski vacation work on a reasonable budget. The best times for pricing tend to be late March, when Breckenridge is busier, and late January. Lodging deals abound at this time.
Best Time To Fly To Keystone: Keystone is located far enough from the Vail-Eagle airport, about an hour, that the case for paying up to fly in there is weaker than it is for Vail or Beaver Creek. Most people will fly into Denver and face down the drive or shuttle up the I-70 canyon. Flying to Denver tends to be cheaper than any other ski airport around, which is why so many people do it, of course. The best times to fly are when business people aren't: Saturdays, Sunday mornings, Wednesdays. The airport gets busy on March weekends with spring break traffic, and around President's Day in February, but cheap fares can be found for much of January into mid February.