The mill will be open from 9 a.m.-5 p.m., both days of the festival.
Visitors can sign up for a mushroom hunt both days. Those interested may register for the hunts at Fox's Overlook from 8-10 a.m., each day, for $8.
Visitors may buy or sell bags of morels during the mushroom auction, which will take place both days.
On Sunday, May 1, a car show and free oldies concert will be featured. Gift shops will have a variety of unique items for sale, include fresh, stone-ground cornmeal and other foods.
Historic Mansfield Roller Mill is managed by Raccoon State Recreation Area and is located six miles south of United States 36 on the east side of State Road 59 in Mansfield.
The mill opens for the season with the mushroom festival.