My Maple tree is 20 years old. The seed pinwheels turned black and did not fall off the tree. The rest of the tree looks ok but the seed pinwheels are still hanging on the tree.
Certified GKH Gardening Expert
The drop of the trees samaras can occur at different times of year. Some years a tree produces more samaras then other years.
I'm confident that when the moisture level dries in the samaras they will drop this fall. This should have no effect on your tree's health.