Sunnyside Cinco De Mayo 2025. The annual cinco de mayo festival is the largest and longest running cultural event in the yakima valley, celebrating mexican and latin american heritage and culture and drawing over 25,000. Cinco de mayo celebrations are planned throughout the valley with the largest occurring in sunnyside and yakima.

The annual cinco de mayo festival is the largest and longest running cultural event in the yakima valley, celebrating mexican and latin american heritage and culture and drawing over 25,000. Cinco de mayo is observed on may 5.