It happened near the 1300 block of West Yakima Avenue early Sunday morning.
The driver has been identified as 22-year-old Jessica Camacho of Yakima. The passenger, 35-year-old, Homero Esquivel, was ejected and suffered serious injuries.
After hitting the trees, both pieces of the car continued moving. The car eventually stopped in front of a business.
Police said speed and alcohol may have been factors in the collision.