Last checked November 3, 2026 against official sources.
This page lists 5 insects and 4 ticks. 1 is venomous by official accounts.
Not every species: no complete official list of Oregon insects exists, so this page covers the ones state and Extension sources name. How lists are built.
Official sources single out these insects in Oregon, in their own words:
Allergic reactions can be life threatening (Oregon Poison Center). “If left untreated, the effects can be life threatening.” Oregon Poison Center, Oregon Health & Science University
Disease (West Nile virus) (Oregon Poison Center). “Mosquitos can transmit more serious diseases like Zika virus or West Nile virus (WNV).” Oregon Poison Center, Oregon Health & Science University
Disease (tularemia) (Oregon Poison Center). “Deer flies can transmit Tularemia, a bacterial infection.” Oregon Poison Center, Oregon Health & Science University
Official sources single out these ticks in Oregon, in their own words:
Disease (OSU Extension). “Other diseases spread by ticks have been found in Oregon including tick-borne relapsing fever, Rocky Mountain spotted fever, tularemia, and Colorado tick fever.” Oregon State University Extension Service
Venomous species first, then A to Z. Do not handle them.
Venom: “To treat a bee sting, avoid squeezing the stinger or venom sac which can release more venom into the skin.” (Oregon Poison Center, Oregon Health & Science University)
Ixodes pacificus
Records of insects in Oregon peak in June to August. They show when people record insects, not how many there are (about month bars).
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 Oregon Poison Center, Oregon Health & Science University and Oregon Department of Fish and Wildlife:
Invasive species sightings: Oregon Invasives Hotline, oregoninvasiveshotline.org or 1-866-INVADER; wildlife conflicts: local ODFW office (ODFW main phone 503-947-6000) Oregon Invasives Hotline
The species list comes from No official list: medically significant and commonly asked species from official sources (Oregon Poison Center; OSU Extension) (Oregon Poison Center, Oregon Health & Science University (poison-control program serving Oregon), undated page (footer © 2001-2026 OHSU); as of retrieval 2026-11-03). 5 more entries come from other official sources named on each card.
Venom labels come only from official sources and link to them; "Not stated" never means harmless. How labels work.
“To treat a bee sting, avoid squeezing the stinger or venom sac which can release more venom into the skin.”
“Mosquitos can transmit more serious diseases like Zika virus or West Nile virus (WNV).”
“Deer flies can transmit Tularemia, a bacterial infection.”
“If left untreated, the effects can be life threatening.”
“If you are experiencing difficulty breathing or swallowing, seek immediate medical attention by calling 911 or the poison center at 1-800-222-1222.”
“Their peak season begins in the summer and continues through the fall.”
“Other diseases spread by ticks have been found in Oregon including tick-borne relapsing fever, Rocky Mountain spotted fever, tularemia, and Colorado tick fever.”
“Wear over-the-ankle boots and loose-fitting long pants.”
“Report potential invasive species you've found to the Online Hotline. Your submission will provide vital early detection information to the experts working to stop the next invasion before it starts!”
