I don't think you would have found lilacs up here in June either. They are usually completely gone by the end of May. I remember the year I graduated in Great Falls though they were in full bloom in our backyard over my graduation weekend. We have photos taken of me in my high school graduation gown in front of beautiful lilacs. I had hoped they would be in bloom over DD's graduation 2 years ago because my lilacs that I planted when I moved into our current house are finally large enough for photo backgrounds.