Four Seasons in Japanese

The names of the four seasons in Japanese are natsu, haru, fuyu and aki.

• natsu 夏
  Summer.
• haru 春
  Spring.
• fuyu 冬
  Winter.
• aki 秋
  Autumn.

A single "season" is called a kisetsu 季節. And the word for the "four seasons" in Japanese is the Japanese number "four" followed by the kanji for "season," see: shiki 四季.

Sometimes, shunkashuutou 春夏秋冬 can be used to refer to the four seasons, or to each or every one of them. This word would be a "four-character idiom," yojijukugo 四字熟語.