A Yellowstone National Park Fishing Permit is required to fish in the park. Anglers 16 years of age and older are required to purchase either a $18 three-day permit, a $25 seven-day permit or a $40 season permit.
Anglers 15 and younger have two options:
1) Children 15 and younger may fish without a permit if they are fishing under the direct supervision of an adult who has a valid park fishing permit, or
2) Children 15 and younger may obtain a free permit that must be signed by a responsible adult; with this permit, a child can fish without direct adult supervision.
Fishing permits are available at all ranger stations, visitor centers, and Yellowstone Park General Stores. Fishing permits are also available at many businesses in the Greater Yellowstone Area. No state fishing license is required in Yellowstone National Park.