SALEM, Ore. – Oregon’s forests are bracing for another challenging year as climate conditions continue to strain tree health across the state. Experts say this spring is already showing similarities to 2015, a year marked by extreme heat and drought, raising concerns about the months ahead.
The troubling start follows a historically warm winter that tied 1934 as the warmest on record since consistent tracking began in 1896, according to federal climate data. Scientists warn that these patterns are part of a broader trend of long-term environmental stress affecting Oregon’s trees.
For at least the past two decades, trees statewide have endured repeated periods of “hot drought” — a combination of high temperatures and limited moisture. While occasional relief has occurred, the cumulative effects of persistent warm and dry conditions are taking a toll.
Key stress factors include higher-than-average temperatures, inconsistent precipitation patterns, more winter moisture falling as rain instead of snow, and earlier snowmelt. Together, these changes reduce the water available to trees during critical growing periods.
“A warm or dry spring is particularly harmful for trees as this is their most active growing period,” said Oregon Department of Forestry Forest Entomologist Christine Buhl. “This stress reduces growth, weakens defenses against opportunistic insects and diseases, and can outright kill tissues or whole trees.”
Buhl noted that warmer conditions also favor the spread and survival of tree pests. Milder winters allow more insects to survive, expand into new areas, and feed for longer periods, further compounding the stress on already vulnerable forests.
To help mitigate these impacts, forestry experts are urging landowners to adapt their practices. Recommendations include planting tree species suited to both current and projected climate conditions, avoiding planting during dry periods, and ensuring seedlings are protected from heat and dehydration.
Additional guidance includes reducing competition for moisture by controlling weeds and thinning tree stands, using mulch or native vegetation to retain soil moisture, and avoiding soil compaction caused by heavy equipment. Experts also advise against fertilizing drought-stressed sites, as increased growth can raise water demands beyond what the environment can support.
In areas where traditional species are struggling, landowners are encouraged to consider more drought-tolerant seed sources—or, in extreme cases, entirely different species better suited to changing conditions.
State officials say proactive management will be critical as climate pressures intensify, emphasizing that Oregon’s forests will increasingly depend on adaptive strategies to remain resilient in the years ahead.
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