Wildpulse
Photo: Davefoc, CC BY-SA 3.0, Wikimedia Commons
The Western Black Widow (Latrodectus hesperus) belongs to the group Arachnids. Wildpulse holds 19,261 reporting days in 1,479 map cells (hexagons about 14 miles / 22 km across) from open data by iNaturalist and GBIF.
Most reporting days are in United States of America (16,354), Mexico (1,190) and Canada (1,001).
The Western Black Widow is reported all year round, most often in September (17 % of reporting days). This shows when people observe and report the species, not necessarily when it is most present.
The latest report in our data is from November 9, 2026.
View on the map →Where is the Western Black Widow reported?
When is the Western Black Widow reported?
This is just a snapshot – see more on the map
The Wildpulse map shows all animals and sightings worldwide: zoom in to single reports, see what has been reported near you, watch live, and report an animal yourself. You never need a password.
More sightings of the Western Black Widow →Open the Wildpulse map