The Kasabbaan Festival is a highly anticipated annual event in the town of San Guillermo, located in the province of Isabela, Philippines. During the Kasabbaan Festival, locals and tourists alike gather to celebrate the town's bountiful harvest. The festival usually runs for a week and features colorful parades, street dances, and various competitions showcasing the town's rich culture and traditions.

The Kasabbaan Festival of San Guillermo is deeply rooted in the agricultural sector, and it is celebrated to give thanks for a plentiful harvest. The festival is named after the native Gaddang term "kasaba," which means "harvest." The Kasabbaan Festival of San Guillermo is a vibrant celebration that offers visitors an opportunity to experience the beauty and diversity of Philippine culture. One of the highlights of the Kasabbaan Festival is a grand parade that showcases various floats decorated with colorful fruits and vegetables, which are harvested during the season. Additionally, during the festival, there are traditional dances that locals and visitors can enjoy. The Kasabbaan Festival of San Guillermo is a true reflection of the local community's love for their land and appreciation for its bounties. The Kasabbaan Festival of San Guillermo is a magnificent display of the rich agricultural traditions and cultural heritage of this charming town in the Isabela province of the Philippines.