Spiders in Colorado
The quickest way to know which spiders live in Colorado is to see what people are actually finding. The map below shows recent, verified spiders sightings across Colorado, and the list beneath it is the spiders recorded most often there lately. Nearly all are harmless. Only the widow spiders and the recluses can give a medically serious bite, and both are shy; each species page notes any worth caution.
Recent research-grade sightings from the iNaturalist community, filtered to spiders across Colorado.
Spiders seen most often in Colorado
Ranked by recent research-grade observations. Tap any species Huck has catalogued for how to identify it, its habitat, and its safety notes.
Built from recent research-grade iNaturalist observations. Identifications are community-sourced and the ranking reflects where people record wildlife, so a species seen often here is not necessarily common everywhere in Colorado. Treat this as a live snapshot of what people are finding, not a formal checklist.
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Common questions
What spiders live in Colorado?
Commonly recorded spiders in Colorado include Bold Jumping Spider, Western Black Widow, Apache Jumping Spider, Zebra Jumping Spider, Woodlouse Spider, based on recent research-grade iNaturalist observations. The full list below is ranked by how often each has been seen lately.
Which spiders in Colorado are dangerous?
Identify the species rather than guessing from size or looks. In the United States only the widow spiders and the recluses can give a medically serious bite, and both are shy and bite only when trapped against skin. Each species page flags any worth caution.
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