Photo: Roman Biernacki
The morning mist clings to the ponderosa pines like a quiet secret as I stand at the trailhead of Three Sisters Open Space in Evergreen, Colorado. The air carries that distinct mountain forest smell; a blend of pine resin, decomposing needles, and the crisp bite of 7,500 feet elevation. I am not here to summit anything today. I am not tracking miles or chasing a personal record. I am here to do something that sounds almost too simple to be therapeutic: I am here to bathe in the forest.
For those of us in recovery from substance use disorder, the search for evidence based healing modalities can feel endless and sometimes frustrating. We wade through conflicting advice, trendy wellness fads, and well meaning suggestions that lack scientific backing. So when the concept of shinrin yoku, or forest bathing, started gaining traction in recovery communities, I wanted to know the truth. Not the Instagram version. Not the watered down wellness spin. The actual peer reviewed science.
Forest bathing originated in Japan in the 1980s as a public health initiative. Unlike hiking, which often emphasizes distance, elevation gain, and physical exertion, shinrin yoku invites practitioners to slow down dramatically. The practice involves walking slowly through forested environments, engaging all five senses, and spending extended time, typically two hours or more, immersed in the natural world without destination or agenda.
When I practice this at places like Meyer Ranch Park outside of Conifer, Colorado, the shift in mindset is palpable. Instead of pushing toward the meadow overlook at 9,000 feet, I might spend twenty minutes examining the lichen patterns on a single Douglas fir. I notice the way sunlight filters through lodgepole pines in distinct golden shafts. I feel the texture of granite boulders that have sat in this exact spot for millennia. This intentional slowness activates something different in the nervous system than a brisk trail run ever could.
Here is where the science gets genuinely exciting for those of us in recovery. Multiple peer reviewed studies have demonstrated that forest environments trigger measurable changes in brain chemistry. Research published in the International Journal of Environmental Research and Public Health found that forest bathing significantly reduces cortisol levels, the primary stress hormone that often runs rampant in people recovering from addiction.
But the benefits extend beyond stress reduction. A landmark study from Chiba University in Japan measured participants' brain activity during forest exposure and found increased parasympathetic nerve activity, essentially the body's rest and digest mode, paired with decreased sympathetic nerve activity, our fight or flight response. For anyone whose nervous system has been hijacked by years of substance use, this recalibration is not just pleasant. It is restorative at a cellular level.
The forest does not ask anything of us. It does not demand we perform or produce or prove our worth. It simply exists, and in that existence, it invites us to do the same.
Perhaps most relevant to substance use disorder recovery, research has shown that time spent in forest environments increases natural killer cell activity and the production of anti cancer proteins. While this immune function research was not conducted specifically on people with addiction histories, the implications are significant. Chronic substance use often compromises immune function, and practices that support immune recovery deserve attention in comprehensive recovery planning.
One of the most fascinating discoveries in forest bathing research involves phytoncides, the volatile organic compounds released by trees. Conifers like the Engelmann spruce and subalpine fir that dominate Colorado's high country forests release particularly high concentrations of these compounds. When we breathe in forest air, we absorb these phytoncides through our lungs and skin.
Studies have shown that phytoncide exposure decreases adrenaline and noradrenaline concentrations in urine, indicating reduced stress hormone production. A 2009 study published in Environmental Health and Preventive Medicine found that even brief forest exposure, around 15 minutes of walking in a forest versus an urban environment, produced significant physiological changes including lower pulse rate, lower blood pressure, and increased heart rate variability.
For those of us who have experienced the dysregulation of active addiction, these findings matter. The neural pathways carved by substance use do not simply disappear when we get sober. They require rewiring, and practices that support nervous system regulation become essential tools in sustainable recovery. This connects deeply to why cold exposure practices have also gained traction in recovery communities; both modalities work directly with the autonomic nervous system.
Co occurring mental health conditions affect an estimated 40 to 60 percent of people with substance use disorders. Depression and anxiety often precede addiction, accompany active use, and persist into recovery. This is where forest bathing research becomes particularly compelling.
A meta analysis published in Urban Forestry and Urban Greening examined 28 studies on forest therapy and found consistent reductions in depression, anxiety, and negative affect across multiple populations. Another study from Stanford University demonstrated that participants who walked for 90 minutes in a natural area showed decreased activity in the subgenual prefrontal cortex, a brain region associated with repetitive negative thoughts and rumination.
Anyone in recovery knows the exhausting weight of rumination. The endless loops of shame, regret, and catastrophic thinking that can dominate early sobriety and persist for years. The idea that walking slowly through an aspen grove at Kenosha Pass could literally quiet that brain region feels almost too good to be true. But the research supports it.
Understanding the science is one thing. Actually integrating forest bathing into a recovery lifestyle is another. Based on the research and my own experience with building a nature routine in early recovery, here are evidence based guidelines for getting started.
Most studies showing significant benefits involved forest exposure of two hours or longer. However, even 15 to 20 minute sessions produced measurable physiological changes. For sustainable practice, aim for one longer forest bathing session weekly, supplemented by shorter daily nature exposure when possible.
Dense forest cover appears to produce stronger effects than sparse woodland or urban parks. In the Denver metro area, excellent options include Staunton State Park's old growth forests, the dense pine corridors of Mount Falcon, and the mixed conifer stands at Alderfer Three Sisters. At higher elevations, spots like Brainard Lake's subalpine forest offer particularly high phytoncide concentrations.
Leave fitness trackers and phones behind, or switch them to airplane mode. Walk slowly, much slower than feels natural at first. Pause frequently. Touch bark, smell needles, listen for birdsong and wind in branches. Resist the urge to accomplish anything. The entire purpose is purposelessness.
This intentional slowing down mirrors many principles from mindfulness practices on the trail. The goal is not to achieve a particular state but to allow the nervous system to settle into the present moment without agenda.
Intellectual honesty requires acknowledging the limitations of current research. Most forest bathing studies involve relatively small sample sizes. Few have been conducted specifically on populations with substance use disorder histories. The exact mechanisms by which forest exposure produces therapeutic benefits remain partially understood. And no responsible researcher would suggest that forest bathing alone constitutes adequate treatment for addiction.
What the evidence does support is that forest bathing is a low risk, accessible practice that produces measurable benefits for stress regulation, mental health, and immune function. For those of us building recovery on multiple foundations, it represents one more evidence based pillar in a comprehensive approach to healing.
Tomorrow morning, before the trails get crowded, I will drive up to Maxwell Falls trailhead. I will leave my watch in the car. I will walk slowly through the creek side pine forest, letting my eyes rest on details I usually rush past. I will breathe deeply and let the phytoncides do their quiet work on my nervous system.
This is not magical thinking. This is not wellness culture fluff. This is peer reviewed science pointing toward something our ancestors knew intuitively: the forest heals us because we evolved within it. Our nervous systems are calibrated for this environment. In recovery, we learn to trust our bodies again after years of betrayal. Forest bathing offers one more pathway back to that trust.
If you are looking for community to explore these practices with, Sober Outdoors offers regular group outings throughout Colorado that incorporate forest bathing principles into substance free adventures. Visit soberoutdoors.org to find upcoming events and connect with others who are discovering that the trail offers something medication alone cannot: a place where healing happens simply by being present in the wild.