When to visit, and what each season actually delivers
Korea has four sharply distinct seasons and the difference between them is larger than most visitors expect. What each one is genuinely like, including the parts brochures omit.
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Spring: the best conditions, the biggest crowds
April and May are close to ideal — mild, dry, and the period when the country is most photogenic. Cherry blossom moves north over roughly two weeks, starting in the far south and reaching Seoul in early April.
The blossom window is short and it is the single most crowded time to travel domestically. Accommodation in blossom destinations books out well in advance and prices rise accordingly.
Late May is an underrated compromise: warm, green, and considerably quieter than April.
Summer: hot, wet, and the coast comes alive
Late June through July brings the monsoon, and the rain is heavy rather than intermittent. August is hot and humid in a way that makes daytime sightseeing in cities genuinely unpleasant.
This is nonetheless the peak domestic holiday season, because it is when Koreans go to the beach. East coast towns are at their liveliest and their most expensive in early August.
Summer is the right season for the mountains and the coast and the wrong season for walking around cities. Plan accordingly and treat late afternoon as the start of the day.
Autumn: the strongest all-round case
October is the best month to visit Korea for most purposes. The air is clear and dry, temperatures are comfortable, and autumn colour moves down the country through late October and into November.
It is also the densest part of the festival calendar. Harvest festivals, food festivals and cultural events cluster heavily in September and October, which makes it the best season for exactly the kind of regional travel this site is built around.
National park trails at peak colour are extremely busy on weekends. Go on a weekday if you can.
Winter: cold, clear and quiet
Winter is properly cold, particularly in Gangwon and the inland north, where temperatures well below freezing are routine. It is also dry and often brilliantly clear.
The compensations are real: ski resorts, ice fishing festivals, hot spring towns, and mountain temples in snow with almost nobody else there. Domestic travel is at its cheapest and quietest outside the ski areas.
Jeju is the mild exception and stays well above freezing, though it is windy enough that this matters less than the numbers suggest.