Key:seasonal

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Public-images-osm logo.svg seasonal
Four seasons.jpg
Description
Describes features that depend on seasonal conditions
Used on these elements
may be used on nodesmay be used on waysmay be used on areasmay be used on relations
See also
Wikidata
Status: in use

Useful for features which appear or disappear with differing seasonal conditions. Wetlands can dry out in the summer, ponds can disappear entirely in hot weather. Grocers/farmer's markets might be open only in the warmer season and rural roads might close from the first snow until thaw.

Usage

Value Description
seasonal=yes common description
seasonal=spring/summer/autumn/winter/wet_season/dry_season/... describes exact season (if possible) when feature is present.
Implies seasonal=yes for that season. Note these values can be ambiguous for features that that vary between different states since it can be unclear which state occurs at which time of the year.
seasonal=no to indicate that a feature is not seasonal although it is expect to be (for instance a road that is not seasonal in an area with a lot of seasonal roads)

OSM uses British English, thus autumn not fall.
You could consider using a semi-colon value separator (;) to specify several seasons, but please note that very few applications actually support this.

Values

This tag is described as having freeform value. For waterways (waterway=river, waterway=stream, waterway=canal, waterway=ditch, waterway=drain) it is used over 100 000 times with - as of December 2017 - the following values being used more than 20 times:

In addition seasonal=spring, seasonal=summer, seasonal=autumn, seasonal=winter, seasonal=dry_season are rarely used. No other valid values are in use for waterways.

For other objects, in particular roads, more varied values are used including seasonal=spring;summer;autumn or seasonal=christmas.

Associated features

Relation to intermittent

intermittent=yes marks features that are non-permanent. It is open question whatever it is preferable to tag (for example) river flowing only every spring as:

or

Depending in interpretation first tagging may be similar to tagging highway=motorway + motor_vehicle=yes (adding pointless detail) or second may be like tagging only parking=surface without amenity=parking (adding only highly detailed tag and expecting that data consumers interested only in much more general data will still use it)

Note that as it is much simpler (only boolean values) and much more popular it is more likely to be used by data consumers.

See also

  • intermittent=*, for water features that are non-permanent.
  • opening_hours=*, for amenities that open/close based on dates (rather than seasonal conditions).