Portland summers bring beautiful sunny days—but they also bring intense heat that can stress our urban forest. As temperatures climb, proper tree care becomes essential for the health and longevity of the trees that provide shade, cleaner air, and beauty across our neighborhoods.

At Harrity Tree Specialists, we fully support the excellent guidance from Portland Parks & Recreation’s Urban Forestry Division. Here’s an expanded look at their top tips, plus practical advice tailored for Portland homeowners.

1. Hydration Is Key

Trees need deep, consistent watering during extended heat. Provide a slow, thorough soak at the base so moisture reaches the root zone. Water early morning or late evening to minimize evaporation.

Portland Tip: Focus on the drip line (outer edge of the canopy) and beyond. Newly planted trees need 15–25 gallons per week; established trees benefit from deep watering every 7–14 days during dry spells.

2. Mulching Matters

A 3–4 inch layer of organic mulch retains moisture, regulates soil temperature, and suppresses weeds. Keep mulch 2–3 inches away from the trunk to prevent rot.

This simple step makes a big difference in Portland’s clay soils, which can dry out quickly in summer.

3. Prune Wisely

Remove dead or poorly attached branches for safety and structure. However, avoid heavy pruning during heat waves—it adds extra stress. Wait 2–3 years before major pruning on newly planted trees.

For best results, schedule structural pruning with certified arborists outside of peak summer heat.

Learn more about our professional pruning services

4. Shield Young Trees from the Sun

Newly planted or young trees are especially vulnerable. Use temporary shade cloth or burlap during extreme heat, then remove it when temperatures cool.

5. Watch for Signs of Stress

Look for wilting, yellowing leaves, scorched edges, or early leaf drop. If you notice these, increase watering immediately and consider professional assessment.

6. Know Your Trees

Different species have varying heat and drought tolerance. Understanding local favorites like Douglas-fir, maple, and oak helps you provide targeted care.

Why These Steps Matter in Portland

Portland’s urban forest is a $6+ billion asset that combats climate change, reduces temperatures, and supports wildlife. Recent studies show declining canopy coverage in some areas, making individual tree care even more important.

For the City’s full resources, visit the Portland Urban Forestry tree care page.

Partner with Local Experts for Best Results

While these tips form a strong foundation, professional evaluation ensures your trees get exactly what they need—especially after harsh weather or for valuable mature specimens.

Ready to give your trees expert summer care? Book a free consultation with Harrity Tree Specialists today. Our ISA Certified Arborists serve all of Portland and the Vancouver metro area with pruning, plant health care, risk assessments, and more.

Call (503) 331-0452 or visit harritytrees.com to schedule.