The best time to go to Phu Tho is during the dry season, which runs from October to April.During these months, you'll experience pleasant temperatures and minimal rainfall, making it ideal for exploring the province's natural beauty and historical sites. The weather is generally sunny and comfortable, superb for outdoor activities like visiting Thanh Thuy Hot Spring or exploring Xuan Son National Park.For those interested in cultural events, visiting in early spring, specifically around the 10th day of the third lunar month (usually April), is recommended. This is when the Hung King Temple Festival takes place, a significant national celebration honoring the mythical founders of Vietnam.