What Is Kigo?
Kigo are the words and images in a haiku that signal a season — a haiku's traditional way of anchoring a single moment in time.
Reviewed for accuracy · Last updated August 4, 2026
Definition
Kigo (季語) are season words — specific words or phrases that traditionally signal which season a haiku takes place in. In Japan, kigo are cataloged in reference books called saijiki, which list thousands of seasonal words along with example poems. "Cherry blossom" means spring. "Cicada" means summer. A skilled reader recognizes the season immediately, without it ever being stated directly.
Why kigo matters
A kigo does two things at once: it locates the poem in a specific moment in the yearly cycle, and it brings a whole set of seasonal associations into the poem without having to spell any of them out. That's consistent with haiku's broader instinct toward compression — one well-chosen seasonal image can carry more than a full sentence of description.
Examples by season
Spring
- cherry blossom
- frog
- spring rain
- tulip
- skylark
Summer
- firefly
- cicada
- summer moon
- watermelon
- thunder
Autumn
- harvest moon
- migrating geese
- first frost
- chrysanthemum
- cricket
Winter
- first snow
- bare branches
- icicle
- winter moon
- sleet
Is a kigo required?
Traditionally expected, but not a strict requirement — especially in modern English-language haiku, where plenty of respected poems skip a seasonal reference entirely in favor of a different kind of specificity. The Haiku Checker treats a missing kigo as neutral information, not a failure.
Example
harvest moon rises the scarecrow's shadow lengthens crows settle to roost
"Harvest moon" places this firmly in autumn, and every other image in the poem — the lengthening shadow, the crows settling in for the night — reinforces that same time of day and year without restating it.
Frequently asked questions
Is kigo the same in every country?
No. Traditional Japanese kigo are cataloged in reference books called saijiki, tuned to Japan's climate and culture. English-language haiku poets have adapted the concept to their own regions and seasons, so a 'kigo' in one place may not read as seasonal somewhere else.
Can a kigo be an object instead of a plant or animal?
Yes — kigo include weather, festivals, foods, and everyday objects associated with a season (a fan for summer, a kettle for winter), not just nature imagery.
What happens if the Haiku Checker doesn't recognize my seasonal word?
It only flags words in its current reference list and says so explicitly rather than claiming your poem lacks a seasonal reference — the list is a starting point, not exhaustive.