Bare trees and dark by five make it tempting to stay in. A 15-minute winter walk still lifts mood, and morning daylight does more for you in winter than in any other season.
Every year around November I get the same question: does any of this still count when the trees are bare and it is dark by five? The practical answer is yes, and winter adds one benefit summer cannot match. I used to answer from experience. Now I can answer from the studies.
Almost all forest research had been done in leaf, which is why a Polish team ran their study in winter. They took 62 young adults to a leafless forest in early March, at about 4 degrees Celsius with no snow, and to a city square, and had each group stand and look for 15 minutes. The winter forest improved mood, restoration and energy, while the city square made all three worse. The effect held without leaves.
The two-hour threshold from the big English survey was measured year-round too. The link between weekly nature time and wellbeing held in the full-year data, winter included. Winter visits were fewer and shorter, which is a reason to plan them instead of skipping them.
For any single walk, outside beats inside. A review of 11 trials that compared the same exercise done outdoors and indoors found that outdoors produced more energy and revitalization, and less tension, confusion and anger. Most of the trials were short, and none checked whether people kept it up. For one session, the outdoor version came out ahead.
Then there is light, the winter-specific reason to go. A team at the University of Colorado sent people camping with no electric light, in summer and in winter. Living on natural light shifted their internal clocks earlier and undid the drift that builds up over a weekend indoors. The winter trip, with far less daylight, still worked. A commentary on that study put it plainly: the price of electric light is a late internal clock, and daylight in the morning is the correction. A bright office gives you a fraction of the light you get outdoors on an overcast winter morning.
A morning walk gets you both winter benefits at once, the mood lift and the light. If walking is out, the light still comes to you. A chair by an east-facing window with the blinds open, or 10 minutes on a doorstep with coffee, delivers most of it, since the camping study was about light exposure. For the mood lift you need to be out among the trees, and the Polish group got it standing still.
The winter study ran on a cold, dry day. Rain changes comfort, and comfort affects how long you stay, which affects the dose. It does not change what the trees and the light do.
For most healthy adults, no. The winter forest study had people standing still in a Polish forest in early March. If you have a heart or lung condition, cold air is a real load, and your doctor's advice comes first.
Lamps help and are well studied for seasonal low mood. Outdoor light, even on an overcast day, is brighter than ordinary indoor lighting, and it comes with the rest of what these notes describe.
Connect at the Hudson's Pace is a 45-minute walk in Riverside Park with the river on one side and open sky on the other, which is exactly what a winter morning needs.
On the science: every study here is real. The underlined phrases link straight to the papers, and the full list is below. The summaries and takeaways are my own reading, simplified to be useful rather than complete.
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