Health8 min read

# Does Walking Really Lower Cortisol? What Three Studies Actually Measured

"Go for a walk, it'll lower your stress hormones" is one of those pieces of advice that gets repeated so often it stops sounding like a claim that needs evidence. It turns out some researchers actually tested it directly - collecting saliva or hair samples before and after real walks, not just asking people how they felt. Three studies below did that, in 2019, 2024, and 2025. The numbers they found are specific, and they don't all point the same direction you'd guess.

## Does walking actually lower cortisol?

For most people, yes - and this isn't inferred from mood surveys. A 2019 study published in _Frontiers in Public Health_ measured salivary cortisol directly before and after a short walk and found it dropped. Not everyone responded the same way: 69% of participants showed a measurable decrease, while the rest showed little change or a slight increase. That's worth sitting with before the specifics below - this is a real, measured effect for most people, not a universal guarantee for every walk you take.

## What a 2019 study found when it measured cortisol before and after a walk

The clearest data point comes from Kobayashi and colleagues, published in _Frontiers in Public Health_ in 2019. Seventy-four young men walked for 15 minutes at a slow, controlled pace across seven forested sites and seven urban sites in Japan, with saliva collected immediately before and after each walk. The pace was deliberately matched between the two conditions, so the only real variable was the setting.

After the forest walk, average cortisol fell from 9.70 to 8.37 nmol/L. After the urban walk, it barely moved - 10.28 to 10.01 nmol/L. Same duration, same pace, same instructions to the participants. The setting was what changed the outcome.

## Does it matter where you walk?

A second study backs this up with a bigger effect size. Aras and colleagues, publishing in the _International Journal of Environmental Research and Public Health_ in 2024, had participants take 20-to-22-minute walks on two different routes: an urban road, and a 1.2-mile wooded path they called the Green Road. Cortisol dropped on both routes - but by 53% on the Green Road versus 37% on the urban route.

The important part for anyone without easy trail access: the urban walk still produced a real 37% drop. Nature adds to the effect, it doesn't create it from nothing. If your regular route is mostly sidewalks and street crossings, that's still doing real work - a greener alternate loop is a bonus, not a requirement. If you do want to compare how a park route feels against your usual one, Stepzy's [GPS workout maps](https://getstepzy.com/docs/route-flyover) let you look back at where a walk actually went, which makes it easier to notice which routes you keep coming back to.

## How long do you need to walk to see a difference?

Neither study above used anything close to a full workout. Kobayashi's walk was 15 minutes. Aras's was 20 to 22 minutes. Both found a measurable same-day change in that window, which puts the effective dose in this research closer to a lunch-break walk than a training session. There's no evidence here that a longer walk is required before anything happens - the studies simply didn't test durations shorter than about 15 minutes, so that's the lower bound the current research actually covers.

## Does the walk need to be brisk, or is a slow one enough?

In the 2019 study, participants were specifically instructed to walk at a relatively slow, matched pace in both settings - the researchers controlled for intensity on purpose, so they could isolate the effect of the environment rather than the effort. A slow, unhurried walk still produced the cortisol drop in the forest condition. That doesn't rule out a benefit from a brisker pace - it just means the studies behind these specific numbers didn't require one. If a slow walk is what you can actually fit into a stressful day, there's no evidence here that you're leaving the benefit on the table by not pushing the pace.

## What a month of regular walks does, according to a 2025 study

A single walk is one data point. A study by Jezova and colleagues, published in _Scientific Reports_ in 2025, looked at what happens over time in older adults who walked regularly - two 40-minute sessions a week (25 to 30 minutes of walking plus 10 minutes sitting and observing the surroundings) for one month, in either a forest or an urban setting.

Instead of same-day saliva cortisol, this study measured hair cortisol - a marker that reflects cumulative stress hormone exposure over weeks rather than a single walk. After a month of forest walking, hair cortisol was significantly lower than it had been the month before. The urban-walking group didn't show the same drop. That's a different kind of evidence than the first two studies: it suggests the effect isn't just a same-day reset, it can show up as a lower baseline after a repeated habit - at least in this specific study, and at least for the forest condition.

## Morning walk or evening walk for stress?

This is where it's worth being honest about what the research doesn't say: none of the three studies above tested morning walks against evening walks for their effect on cortisol. What is well established, separate from any of these studies, is basic circadian biology - cortisol naturally runs highest in the hour or so after waking and gradually tapers through the day. But that pattern existing on its own doesn't tell you whether walking in the morning or evening produces a bigger stress-relief effect, because that specific comparison hasn't been run for walking. If timing is something you want to dial in for other reasons - sleep, energy, what actually fits your schedule - that's covered in more detail in [the best time of day to walk, according to research](https://getstepzy.com/blog/best-time-of-day-to-walk).

## Building a stress-relief walk into a week that doesn't cooperate

The most useful finding across these three studies isn't any single number - it's that the 2025 study measured a repeated habit, not one perfect walk, and that's what showed up in the longer-run marker. A stressful week is exactly when a walk is easiest to skip and most likely to help, which is also exactly when an all-or-nothing streak does the most damage. Stepzy's [Streak Skips](https://getstepzy.com/docs/streak-skips) let a set number of off days pass without erasing what you've already built - the same argument we make in [why a streak with skips beats a perfect streak](https://getstepzy.com/blog/streaks-that-forgive), applied here to a walk you're taking specifically to unwind.

A single fixed daily target also doesn't fit a week where some days are calm and others aren't. [Weekday and weekend split goals](https://getstepzy.com/docs/weekday-weekend-goals) and [adaptive goals](https://getstepzy.com/docs/adaptive-goals) let the target flex instead of treating every day as a shortfall waiting to happen. If you just want a concrete number to aim for on a stressful afternoon, Stepzy's [walking time calculator](https://getstepzy.com/tools/walking-time) can turn "15 to 20 minutes" into an actual distance at an easy pace. And if you're curious how a stress-focused walk fits alongside the separate research on steps and mood in general, that's covered in [how many steps a day actually help your mood](https://getstepzy.com/blog/how-many-steps-for-mental-health).

This is general wellness information, not medical advice or a treatment for a diagnosed stress or anxiety condition. All three studies above involved relatively small samples - 74 participants in the largest - so individual results vary, and the 2019 study found roughly a third of participants didn't show the typical drop at all. If stress is something you're managing clinically, talk to a doctor about what fits alongside your care. For most people without those considerations, the practical takeaway holds up across all three studies: a walk in the 15-to-40-minute range, taken somewhat regularly, is doing real, measured work - and a greener route seems to help more, without a plainer one doing nothing.

Track steps, streaks, and progress trends in one simple app.

[![Download on the App Store](https://tools.applemediaservices.com/api/badges/download-on-the-app-store/black/en-us?size=250x83)](https://apps.apple.com/us/app/stepzy-smart-step-counter/id6758810944)

## Keep reading

[HealthWalking and Cancer Risk: What Two 2025 Studies Actually Found](https://getstepzy.com/blog/walking-and-cancer-risk)[HealthWalking for Lower Back Pain: What a 2024 Trial and a 2025 Study Actually Found](https://getstepzy.com/blog/walking-and-lower-back-pain)[HealthHow Many Steps a Day Actually Help You Live Longer?](https://getstepzy.com/blog/how-many-steps-to-live-longer)

[← Newer postHow Much Water Should You Drink on a Walk? A Steps-Based Hydration Guide](https://getstepzy.com/blog/how-much-water-should-you-drink-while-walking)[Older post →Does Pushing a Stroller Count as Steps? What Your Watch Actually Misses](https://getstepzy.com/blog/does-pushing-a-stroller-count-as-steps)

---

_Source: [https://getstepzy.com/blog/does-walking-lower-cortisol](https://getstepzy.com/blog/does-walking-lower-cortisol). Site index: [llms.txt](https://getstepzy.com/llms.txt). Sitemap: [sitemap.xml](https://getstepzy.com/sitemap.xml)._