Q.Lilies Came Up First Year But The Second Year In The Spring They Did Not Come Up Until Winter. Why
I plant lilies in the spring of 2018. They came up just fine. Spring of 2019 only one lily of about 40 came up. Not December of 2019 they all came up. I live in the Northwest. Any speculation on my crazy lilies?

Certified GKH Gardening Expert
There are many, many species and genus that bear the name of "lily" and it will be important to know, exactly, which one it is to be able to give you the best answer.
Since they all came back this year, I would say that it is because of the type that you have. Some lilies are known for being finicky from year to year.
As long as you are caring for it as you should be, then you should continue to see flowers, somewhat reliably, for years to come.
This collection of articles will help you with the general care of lily plants: https://www.gardeningknowhow.com/category/ornamental/bulbs/lily