The USDA says now… as the snow recedes, mushrooms will begin returning to the forest floor. Personal-use mushroom picking is free and does not require a permit or payment under the legal limits, which authorizes an individual to harvest, possess, or transport less than a gallon of them in Oregon and less than five gallons in Washington. The free mushrooms are only available for personal consumption and cannot be sold, bartered, or given away. Meanwhile, commercial mushroom permits cost $2 per day, with a minimum purchase of 10 days or an annual permit for $100. You must be 18 or older to purchase a commercial mushroom permit.