Jeju is a different island in each season. "Good any time of year" is true and useless. Pick by what a season offers and what it takes away.
Spring, March to April — flowers
Canola fields in Jungmun, Pyoseon and Gasiri peak, and Hallasan's spring blooms arrive with them. The temperature climbs, but the mountain is still its own climate. Pack a layer for Hallasan or an oreum even in spring.
Summer — the sea
Hyeopjae, Hamdeok and Gwakji open up everything the water has to offer: swimming, snorkelling, surfing, yacht tours. If you came to Jeju for the sea, this is effectively the season.
It carries a peak-season price. A compact rental runs 40,000-60,000 won a day, rising more than 1.5x in peak season. Going in summer, book the car at least two weeks ahead.
Autumn — silver grass and foliage
Photographically the most Jeju-looking season. Silver grass reads best along oreum ridgelines, and the windier the day the better it moves. The sea becomes hard to enter, but nothing beats autumn for walking.
Winter — snow and camellias
Hallasan under snow and camellias are the winter argument. But winter closes trails when the weather turns. If Hallasan is the reason you are going in winter, plan an alternative day alongside it. Oreum are less affected.
What does not change with the season
Black pork and seafood end the day in any month. So does the wind — on Jeju an outer layer is not seasonal gear, it is standard kit.
Once the dates are set
The next question is the route, and two nights versus three changes the order completely. The island looks small, but it is 73 km across and the ring road runs over 200 km.
The full list of seasonal highlights and suggested itineraries is on the WeBring blog.