As traveling becomes less restricted I have enjoyed venturing across southwest Indiana over the last few months and seeing all the fall tree colors. I have also noticed many evergreen trees (particularly white pine) that have needles turning yellow.
Typically, I get questions every year from concerned homeowners thinking their trees are dying, but in this case it is normal needle drop. Evergreen needles have various life expediencies. White pine needles live for two years, whereas others can live up to six years. Spruce needles can live three to 10 years. Some evergreens have a subtle needle drop that may go unnoticed, whereas others such as white pine and arborvitae will shed all their old needles at once and are more noticeable.