My zip code is 18032, and the larch tree does not shed needles until the fall. It is June and they are turning brown and falling all over the patio.
Larch Tree Shedding Needles
Certified GKH Gardening Expert
If you have been experiencing extremes in temperatures, such as much warmer weather, then the tree could be stressed, which would make it go into dormancy early to survive. Other than keeping it well watered, there is little else you can do but it should recover on its own. Another possibility could be insects (which would most likely affect the area nearest the crown) or some type of fungus.