Aspen's winter does not arrive all at once. The lifts start turning in late November, the town fills for Christmas, January stacks three big weekends on top of each other, and by April the slopes are full of people in fancy dress. Knowing that rhythm is the difference between paying peak prices for a quiet week and skiing the same mountain for a good deal less.

Here is what happens when, and what you need to book before it does.

How the winter calendar fits together

Think of the season in four parts: the opening weeks from late November to mid-December, the holiday peak from around 20 December to the first week of January, an event-heavy January, and the long stretch from February through to closing day in April.

Demand tracks school holidays and events far more closely than it tracks snowfall. A powder week in early December will cost you less than a dry week in February, and the town will feel more like itself. The dates worth circling are:

• 20 December to 3 January for Christmas and New Year
• The Martin Luther King Jr. holiday weekend, the third Monday in January
• Winter X Games weekend, usually the last few days of January
• Presidents' Week, built around the third Monday in February
• Closing weekends in April, which shift slightly each year

Opening weeks: late November to mid-December

The ski areas aim to open around American Thanksgiving, snow permitting. Early season is always a gamble on terrain, but it is consistently the best value of the winter: lower room rates, quiet lifts and restaurant tables you can actually get.

Thanksgiving itself is a busy four-day weekend, then the first fortnight of December goes quiet. Some restaurants close for a short break before the holidays, and the higher lifts may still be waiting for snow, so check what is scheduled to spin before you commit. If you want a low-key introduction to Aspen and you are not fussy about skiing every acre, this is your window.

Christmas, New Year and the days in between

The last ten days of December are the most expensive and most atmospheric of the year. Aspen runs a programme of seasonal events across that period, with concerts, family activities and film screenings around town, some of them free.

New Year's Eve is the set piece: ski instructors descend Aspen Mountain in a torchlight parade before fireworks over the town. It is worth standing in the cold for, but plan your evening. Restaurants fill weeks in advance, many open their books roughly 30 days ahead, and the popular tables go within minutes of the phone lines opening. Set a reminder and be ready at the right moment.

January: Wintersköl, Gay Ski Week and the X Games

January is the busiest month on the events calendar, with three weekends that pull crowds from across the United States.

Wintersköl, mid-January

Aspen's own winter festival, running since the 1950s, with fireworks, a torchlight descent and a weekend of local events. It is the most homegrown of the three and the easiest to enjoy without a ticket.

Aspen Gay Ski Week, usually the third week of January

One of the longest-running events of its kind in the world, with parties, screenings and a costume downhill that closes the week. Book accommodation early; this one fills the valley.

Winter X Games, late January

Held at Buttermilk, with big air, superpipe and slope events. Spectating is generally free, which makes it a brilliant day out, but the town absorbs a large influx of visitors. If you are coming for it, book lodging months ahead, not weeks.

February to April: Presidents' Week and the spring finish

Presidents' Week is the last guaranteed peak of the season, and in some years rates match Christmas. After it, things loosen noticeably. Late February into early March is the sweet spot for many regulars: the snowpack is at its deepest, the days are longer, and rooms cost less than they did a fortnight earlier.

March brings warmer afternoons, softer snow on south-facing runs and a livelier après scene. April is closing month, with parties at Aspen Mountain, Highlands and Snowmass, and costumes that get steadily more ridiculous. Aspen Shortsfest usually lands in early April if you want a reason to stay in town rather than on the hill.

What to book, and when

Work through this in order and you will avoid most of the stress:

1. Lodging. Six to twelve months ahead for Christmas, New Year, X Games week and Presidents' Week. For everything else, three to six months is usually fine.
2. Flights into Aspen (ASE). Seats are limited and sell out early. Denver, Eagle County and Grand Junction are the usual alternatives, each with a drive attached.
3. Lift access. Buy before you travel. If you are using a multi-resort pass, check the blackout dates on the specific product you hold rather than assuming.
4. Lessons and ski school. Holiday weeks sell out. Book with your lodging, and book private instruction early if you want a named instructor.
5. Rentals and demos. Reserve online and collect the evening before your first ski day.
6. Restaurant tables. Books typically open around 30 days ahead. Diary the date for anywhere you have your heart set on.
7. A suitable vehicle. If you are driving, four-wheel drive or winter tyres are sensible, and Colorado has traction rules on mountain roads. Check conditions before you set off.

Getting there and settling in

Aspen's airport sits about ten minutes from the centre of town. Winter weather delays flights fairly often, so build a buffer day at the end of the trip if you can rather than catching a tight connection home. Driving from Denver takes around four hours in good conditions and considerably longer in snow. Independence Pass is closed through the winter, so you come in via Glenwood Springs.

Once you are here, the town is compact and walkable, with the gondola at the base of Aspen Mountain. Buses link Aspen with Snowmass Village, Basalt and Carbondale, which is useful if you are staying down-valley to save money.

Two last things. Aspen sits at roughly 2,400 metres, so take the first day gently, drink more water than you think you need and go easy on the cocktails. If you have a heart or lung condition, speak to your doctor before you travel. And if you are weighing up dates, the quietest good-value weeks are the first half of December, the stretch after the X Games, and late February into March.

Photo: Surprising_Media / Pixabay