Lilac Sunday has been celebrated at the Arnold Arboretum since 1908. The lilac collection at the Arnold Arboretum is among the premier collections of these plants in North America and is singled out each year for a daylong celebration on May 12.
Tours of the lilacs and family activities are available from 10:00am to 3:00pm on Sunday, May 12. Pack a picnic! Picnicking is permitted on this day only, but food must be brought in to the Arboretum. There will only be lemonade, slush, and ice cream available on site during event hours. The landscape is open from dawn until dusk.