The sheriff's office said deputies found several heat-sealed packages of marijuana inside a duffel bag in the trunk - weighing about 4.3 pounds.
Also found in the car, officials said, were items of drug paraphernalia including syringes and equipment used to produce Cannabidiol oil.
Hatch and Barry W. Herbert Jr., 32, of Roosevelt were arrested and booked into the Ada County Jail.
Both men were set to make their initial court appearances Monday afternoon.
The crime of trafficking in marijuana is punishable by up to 15 years in prison.
Ada sheriff: Utah men had 4 pounds of pot in car
Donald Ray Hatch
LE Number: 1066940 Cell: 742
C/O Ada County Jail
7210 Barrister Dr.
Boise, ID 83704