Lawn Care Calendar for the Pacific Northwest:
http://www.lawncare.net/northwest-lawn-care-calendar/
International Society of Arboriculture:
Local Pests:
Ants:
http://www.mnn.com/your-home/at-home/blogs/13-natural-remedies-for-the-ant-invasion
Fir Beetles:
http://ext.nrs.wsu.edu/forestryext/foresthealth/notes/doublasbeetle.htm
Want to stop weed whacking? How about edging and mulching beds instead.
Edging:
https://www.youtube.com/watch?v=IcSicWAwiXg
Mulching: