Death Cap Mushrooms Kill 3 in California: Complete Safety Guide

Three people are dead, and dozens were hospitalized after California's worst mushroom poisoning outbreak in recorded history. The culprit? Death cap mushrooms, spreading into regions where foragers never expected to find them.

Since mid-November 2025, at least 35 people across nine California counties have been poisoned by wild mushrooms. Three survivors required emergency liver transplants. The death toll continues climbing as the deadly fungi expand their range due to climate change and accidental introduction on imported trees.

In a typical year, California sees about 5 cases of mushroom poisoning. This season, 35 cases were delivered in two months.

Mushroom foraging can be rewarding when done correctly, but a single mistake can cost you your life. The fungi kingdom contains roughly 135,000 species, only a fraction of which have been studied. Some make delicious meals. Others destroy your liver before you even know you're sick.

Here's what you need to know to stay alive.