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As a nonprofit, we foster a greater appreciation of trees and promote the professional practice of arboriculture through education, research, and technology.

AK, ID, OR, WA & BC Canada
Joined September 2014
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🌳 Save the date! Join PNW-ISA for Our Life in Trees: A Pruning Workshop for the Willamette Valley on Feb. 19, 2027, 8:30 AM–4:30 PM in Oregon City. Registration opens Dec. 1! #PNWISA #Arboriculture
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🌳🏆 Congrats to Charles Lystrup and Ellen Odmark for representing PNW-ISA at this year’s ITCC! Special shoutout to Ellen for advancing to the Masters Challenge as ISA celebrated ITCC’s 50th anniversary in St. Louis. #PNWISA #ITCC
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🌳 Ready to advance your tree appraisal skills? Join us Nov. 5–6 in Oregon City for TPAQ training with John Bornsworth. Seats are limited! Register & submit eligibility documents by Oct. 21. pnwisa.org/events/EventDetai… #Arboriculture
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🌲 Join John Bornsworth Oct. 23 in Olympia for Managing Trees & Vegetation on Puget Sound Shorelines! Explore tree risk, ecology, erosion & restoration while earning 7.5 CEUs. Register: pnwisa.org/events/EventDetai… #Arboriculture #PNW
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🪲 EAB has arrived in Portland. Join Anya Moucha at ATC ’26 to explore Portland’s response, including monitoring, treatment, proactive removal, outreach, and management strategies for natural areas. 📅 Sept. 27–30 | Boise, ID #PNWISA
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🌲 Thank you to our ATC ’26 sponsors & exhibitors! Your support brings our arboriculture community together for learning, connection & collaboration. Stop by the exhibitor tables in Boise! #PNWISA #ATC26 #Arboriculture
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🍄 Explore how fungal pathogens affect trees at ATC ’26! Andrea Fisher will cover pathogen ID, decay strategies, wood strength, and climbing & rigging techniques for managing compromised conifers. 📅 Sept. 27–30 | Boise, ID #PNWISA
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🌱 Build stronger Plant Health Care programs at ATC ’26! Join Alex Best & Joshua Goode for practical strategies covering IPM, monitoring, seasonal timing, equipment, scouting & region-specific PHC. 📅 Sept. 27–30 | Boise, ID #PNWISA
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🌳 Turn tree planting ideas into successful community events! Join Robin Hastings at ATC ’26 for practical project management tips covering planning, volunteers, logistics, safety & more. 📅 Sept. 27–30 | Boise, ID #PNWISA
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🌳 How can we help trees thrive in a changing world? Join Patrick Anderson at ATC ’26 for “Tree Resiliency in a Changing World” and explore approaches to adaptable, resilient tree care. 📅 Sept. 27–30 | Boise, ID #PNWISA
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🌳 Strong urban forests start with strong partnerships! Join Jennifer Killian & Malcolm Anderson at ATC ’26 for real-world strategies to strengthen collaboration between municipal programs & private arborists. 📅 Sept. 27–30 | Boise, ID #PNWISA
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🌲 Learn how to safely climb and rig compromised trees at ATC ’26! John Shafer will cover techniques for removals involving fungal pathogens, structural defects & tight drop zones. 📅 Sept. 27–30 | Boise, ID #PNWISA
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🌳 Are dynamic cables always the best solution? Join Connor McDermott-Grossman & Allen Taylor at ATC ’26 to explore cabling benefits, drawbacks, alternatives, standards & practical installation techniques. 📅 Sept. 27–30 | Boise, ID #PNWISA
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🌳Join Kevin Van Brunt for “Structural Pruning: A Tree’s Perspective,” a hands-on session focused on improving structural integrity—not just aesthetics or functionality. #PNWISA #ATC26 #Arboriculture
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🌱 Learn how to restore compacted urban soils at ATC ’26! Join Jacob Kite for a hands-on session covering Air Spade use, soil amendments, vertical mulching & radial trenching. #PNWISA #ATC26
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🌳 Sharpen your tree ID skills at ATC ’26! Join Daniel Murphy & Sarah Croak for a guided tree tour at Idaho Botanical Garden and explore key identification features, collection history & more. 📅 Sept. 27–30 | Boise, ID #PNWISA #ATC26
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🌊🌳 Shoreline tree management takes a unique approach. Join us Oct. 23 in Olympia for a hands-on workshop covering ecology, tree risk, erosion, restoration & more. Earn 7.5 CEUs! pnwisa.org/events/EventDetai… #Arboriculture #TreeRisk #ShorelineRestoration #PNW
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🌳 Meet Nolan Sigurdson at ATC ’26! Learn how hard work, continuous learning & new skills can help turn an arboriculture job into a career—and how leaders can help their teams grow.
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🌳 Meet James Pasley & Jennifer Killian at ATC ’26! Explore the root causes of urban tree challenges—from compacted soil to poor water management—and discover strategies for healthier, longer-lived trees.
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🔎🌳 What are trees telling you? At ATC ’26, Patrick Anderson will take you from ground to crown to explore how to recognize signs and symptoms of disorders in the urban forest. Sharpen your diagnostic skills! #PNWISA #ATC26
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