Not every species: no complete official list of Wyoming 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 Wyoming, in their own words:
Culex tarsalis mosquito
Primary vector of West Nile virus to humans in the western US (UW). “The Culex tarsalis mosquito is the primary vector of WNV to humans in the western US.” University of Wyoming Entomology / Extension
Bees, wasps, hornets
Stings. “People who are allergic to venom may experience anaphylaxis, a severe and potentially life-threatening allergic reaction that requires immediate emergency care.” CDC / NIOSH
Ticks (arachnids, not insects)
Official sources single out these ticks in Wyoming, in their own words:
Ticks
Disease (tularemia, Rocky Mountain spotted fever, Colorado tick fever) per Wyoming Department of Health. “Diseases sometimes passed on by infected ticks in Wyoming include tularemia, Rocky Mountain spotted fever (RMSF) and Colorado tick fever (CTF).” Wyoming Department of Health
All 3 insects and 1 tick
From A to Z. Do not handle them.
No confirmed photo of Bees, wasps, hornets
Bees, wasps, hornets
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.
Danger to people
“People who are allergic to venom may experience anaphylaxis, a severe and potentially life-threatening allergic reaction that requires immediate emergency care.” CDC / NIOSH
No confirmed photo of Culex tarsalis mosquito
Culex tarsalis mosquito
Culex tarsalis
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.
No official source we use states whether this animal is venomous. That does not mean it is harmless: do not handle it.
No confirmed photo of Ticks
Ticks
Not statedTick: an arachnid, not an insect
Venom
No official source we use states whether this animal is venomous. That does not mean it is harmless: do not handle it.
Danger to people
“Diseases sometimes passed on by infected ticks in Wyoming include tularemia, Rocky Mountain spotted fever (RMSF) and Colorado tick fever (CTF).” Wyoming Department of Health
When insects are active in Wyoming
Records of insects in Wyoming peak in June to August. They show when people record insects, not how many there are (about month bars).
JanFebMarAprMayJunJulAugSepOctNovDec
5,760 records of insects in Wyoming by month (GBIF, CC0 and CC BY records).
Ticks can be active most of the year in Wyoming; spring and summer are the peak seasons for tick-related illness (WDH). Wyoming Department of Health
If you are bitten or stung
Call 911 or Poison Help at 1-800-222-1222 right away. Poison Help connects you to your local poison center, any time of day.
Official advice from Wyoming Game and Fish Department:
In rattlesnake country wear sturdy boots and long pants, stay on trails, step on logs and rocks rather than over them, keep pets leashed, and use a flashlight at night. Wyoming Game and Fish Department
About this list
Venom labels come only from official sources and link to them; "Not stated" never means harmless. How labels work.
Sources
Nongame Wildlife. Wyoming Game and Fish Department. no page date shown; checked November 3, 2026.
“Diseases sometimes passed on by infected ticks in Wyoming include tularemia, Rocky Mountain spotted fever (RMSF) and Colorado tick fever (CTF).”
“Ticks can be active in Wyoming most of the year, but spring and summer are typically the peak seasons when we see related illnesses.”
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.”
Hiking in rattlesnake country. Wyoming Game and Fish Department. undated page; checked November 3, 2026.Quoted passages (1)
“Use a flashlight at night. Rattlesnakes are often active at night in the summer.”