This page lists 17 insects.
1 is venomous by official accounts. 1 is nonnative.
Not every species: no complete official list of Utah insects exists, so this page covers the ones state and Extension sources name. How lists are built.
Which insects can hurt you
Official sources single out these insects in Utah, in their own words:
Mosquitoes (West Nile virus)
Utah DHHS. “West Nile virus (WNV) is carried by mosquitoes and can cause disease in humans, birds, horses, and some other mammals.” DHHS
Rodent fleas (plague)
Utah DHHS. “It is spread by rodent flea bites and infected animals to humans and can develop into serious infection and death.” DHHS
Stinging insects (allergic reactions)
CDC/NIOSH. “People who are allergic to venom may experience anaphylaxis, a severe and potentially life-threatening allergic reaction that requires immediate emergency care.” CDC / NIOSH
USU Extension. “These bees are more aggressive and will defend the nest in greater numbers compared to domesticated honey bees in the United States; their sting is not more painful or venomous than other honey bees.” Utah State University Extension
All 17 insects
Venomous species first, then A to Z. Do not handle them.
“These bees are more aggressive and will defend the nest in greater numbers compared to domesticated honey bees in the United States; their sting is not more painful or venomous than other honey bees.” Utah State University Extension
Where in Utah
Iron, Kane, San Juan and Washington counties (confirmed colonies, as of the 2010 fact sheet) Utah State University Extension
What the sources say
Venom: “…their sting is not more painful or venomous than other honey bees.” (Utah State University Extension)
No confirmed photo of American bumble bee
American bumble bee
Bombus pensylvanicus
Not stated
Venom
No official source we use states whether this animal is venomous. That does not mean it is harmless: do not handle it.
Conservation
Utah Species of Greatest Conservation Need (2025); status: Petitioned
No confirmed photo of Brine fly
Brine fly
Ephydra gracilis
Not stated
Venom
No official source we use states whether this animal is venomous. That does not mean it is harmless: do not handle it.
“…their sting is not more painful or venomous than other honey bees.”
“These bees are more aggressive and will defend the nest in greater numbers compared to domesticated honey bees in the United States; their sting is not more painful or venomous than other honey bees.”
“West Nile virus (WNV) is carried by mosquitoes and can cause disease in humans, birds, horses, and some other mammals.”
Plague | Communicable Diseases. Utah Department of Health and Human Services (DHHS). undated page; checked November 3, 2026.Quoted passages (1)
“It is spread by rodent flea bites and infected animals to humans and can develop into serious infection and death.”
Insects and Scorpions at Work. CDC / NIOSH. archived copy, captured October 4, 2026; checked November 3, 2026.Quoted passages (1)
“People who are allergic to venom may experience anaphylaxis, a severe and potentially life-threatening allergic reaction that requires immediate emergency care.”
