On April 2, I took these photos of trees at the bottom of the hill. I assumed they were spruces.
As I walked back up the hill, I took this photo of trees at the top of the hill.
I have long suspected that these trees at the top of the hill were firs. In order to further investigate that theory, I took these close-ups of the trees at the top of the hill on April 6:
They have flat needles. I think that means they are firs. The trees at the bottom of the hill have flat needles too. So they are all firs.