Boise Residents Warned of Deadly Death Cap Mushrooms
Local health officials are urging caution as poisonous mushrooms are spotted in the Boise and Garden City area.
Updated on Oct. 15, 2026 in Allergies
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Central District Health has issued a safety warning regarding the presence of death cap mushrooms found across Boise and Garden City. These fungi are considered among the deadliest in the world and present a significant risk if ingested by people or pets.
Why it matters
Death cap mushrooms contain potent toxins that are not destroyed by cooking, freezing, or drying. Because these mushrooms typically grow near oak and hardwood trees following fall rains, residents in the area should remain vigilant.
Poisoning symptoms often emerge 6 to 24 hours after ingestion, with severe liver and kidney damage potentially occurring 3 to 5 days later. For human emergencies, call 1-800-222-1222, and for animals, contact ASPCA Animal Poison Control at 888-426-4435.
The players
Central District Health
This public health agency provides services and guidance to residents of Boise and surrounding areas.
The details
Symptoms of poisoning include severe vomiting, abdominal pain, diarrhea, and dizziness. The mushrooms are known to thrive in autumn conditions, appearing after rain near various hardwood and oak trees.
Timeline
2022: Death cap mushrooms were previously discovered in Boise.
6 to 24 hours after eating: Symptoms of poisoning typically begin.
3 to 5 days later: Severe liver and kidney damage can occur after ingestion.
The Big Picture
This warning follows a pattern set by the 2022 detections of the same species in the Boise area.
Residents should inspect their surroundings near oak and hardwood trees, especially after rainfall. If you suspect ingestion, contact the designated poison control centers immediately as symptoms can rapidly progress to organ damage.
The takeaway
Because these mushrooms are deadly and cannot be made safe through cooking, avoid consuming any wild mushrooms identified near hardwood trees. When walking in local parks or wooded areas, keep a close watch on children and pets to ensure they do not touch or ingest unknown fungi.
Further reading
For more information on managing environmental hazards, visit the Boise Allergies section.
Source note: This article includes information reported by Idaho News 6 Boise Twin Falls (KIVI).
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