Hulda Klager Lilac Gardens – A National Historic Site located in Woodland, WA, Visit Today! Open Daily 10am to 4pm all year. NO pets. Service Dogs per ADA permitted. Lilac Days 2020, April 18 - May 10. Home, potting shed, plant sales, and gift shop open only during Lilac Days. See Today in the Gardens for bloom time. Gardens are wheelchair accessible - Home.