I would trim in the fall... for one reason, there is less sap moving (most in the spring) and less likely to drip pitch on your sidewalk, car, etc. Winter possibly dangerous if there's ice.

Also, for all of the trimmed stumps, paint over them with a neutral color outdoor paint. this will help prevent infections from creeping in.
Source(s):
I used to trim trees at a 3000 acre state park.


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