July and August
Go nowEverything open, the lakes thawed, and the most people
The full park: lakes at their colour, all trails clear, the Icefields Parkway open end to end and daylight until ten. It is also the busiest and most expensive stretch of the year, with lake shuttles booked out and accommodation at a premium. Worth it, but book months ahead.
January, February and March
Go nowSki season, frozen waterfalls and an empty town
Three ski areas on one pass, ice walks in Johnston Canyon, the frozen surface of Lake Louise as a skating rink and hot springs in the snow. A completely different holiday from the summer one and a much cheaper one. Cold — genuinely cold — and short days.
September
Go nowLarch season, thin crowds and clear air
The best-value window of the year: the lakes are still open, the crowds thin after the first week and the alpine larches turn gold for about two weeks in the second half of the month. The elk rut is on, which is why the wildlife rules matter more now. First snow can arrive at altitude.
June
Worth it, butThe thaw, and the lakes not quite ready
Green, long-lit and much quieter than July, with waterfalls at full volume from the melt. Moraine Lake often does not fully thaw until the end of the month and the high trails are still under snow. Cheaper, and a gamble on exactly what you came for.
December
Worth it, butSnow arriving, and the holiday peak
The ski season opens and the town looks the way the postcards do, but conditions are not yet reliable and Christmas and New Year push prices to summer levels. Short days. Good if you want the look rather than the skiing.
October
Worth it, butThe season closing, quiet and cheap
The larches are gone, the lakes begin to freeze and much of the tourist infrastructure winds down. Prices are low and the park is empty. The Icefields Parkway is still open but can close on any given day for snow.
April and May
Think twiceFrozen lakes and no skiing — the worst combination here
The ski season ends and the summer one has not started. The lakes are still frozen and white, the high trails are under snow and the famous photographs are simply not available. Cheap, and the reason it is cheap is that there is very little you came for.
November
Think twiceBetween everything
Too late for autumn and too early for reliable snow, with the lakes frozen, the trails muddy or icy and the lifts mostly not yet running. The lowest prices of the year and the least to do. Skip it unless the price is the entire point.