Step Outside: Why Spring Is the Perfect Time to Walk in the Sun
Written By: Xavier Oyola and Ihsaan Alam
Have you ever noticed that the first warm, sunny spring day feels like a full-body reset? That feeling is not just in your head. Research shows that simply stepping outside for a walk in natural daylight can benefit everything from your mood and sleep to your immune function and bone health.
Your body is running low on sunlight.
After months of shorter days spent indoors, many people arrive in spring with a vitamin D deficiency without realizing it. Sunlight is the primary source of vitamin D, with more than 90% of our supply coming from UV exposure. Studies published on PubMed have linked insufficient sun exposure to conditions including hypertension, type 1 diabetes, multiple sclerosis, and certain cancers. 10 to 30 minutes of sunlight on bare skin a few times a week is enough to support healthy levels, making a spring walk one of the simplest health interventions available.
A natural mood boost
Sunlight triggers the release of serotonin, a neurotransmitter central to mood stability and well-being. The CDC notes that time outdoors promotes mental health and stress reduction, and research from the Cleveland Clinic confirms that sunlight can alleviate symptoms of depression and anxiety. Walking compounds these benefits further — a meta-analysis in JAMA Network Open found that as few as 1,000 steps per day correlated with a 10% decrease in depression risk, with peak benefits around 7,500 steps. That is roughly a 30 to 45-minute walk.
Walking in green spaces — parks, trails, wooded paths — produces even greater mental health benefits than the same walk through urban environments, according to research published in PMC.
Better sleep and a stronger immune system
Exposure to natural daylight, especially in the morning, helps regulate your circadian rhythm — the internal clock that governs when you feel awake and when you wind down. This means a lunchtime walk today can translate into falling asleep more easily tonight. Sunlight also directly activates immune T cells, and time among trees and plants exposes you to phytoncides, natural compounds that research suggests may boost immune defenses.
You do not need a gym membership or a structured plan. The prescription for spring is simple: get outside, let some sunlight reach your skin, and move at whatever pace feels good. If you plan to stay out longer than 15 to 20 minutes, apply a broad-spectrum SPF 30+ sunscreen, and reapply every 2 hours. Your mood, your bones, your immune system, and your sleep will all thank you for it.
References:
Alfredsson, L., Armstrong, B. K., Butterfield, D. A., Chowdhury, R., de Gruijl, F. R., Feelisch, M., Garland, C. F., Hart, P. H., Hoel, D. G., Jacobsen, R., Lindqvist, P. G., Llewellyn, D. J., Tiemeier, H., Weller, R. B., & Young, A. R. (2020, July 13). Insufficient sun exposure has become a real public health problem. International journal of environmental research and public health. https://pmc.ncbi.nlm.nih.gov/articles/PMC7400257/
Centers for Disease Control and Prevention. (2024b, July 1). Benefits of spending time outdoors. Centers for Disease Control and Prevention. https://www.cdc.gov/skin-cancer/outdoors/index.html
Grassini, S. (2022, March 21). A systematic review and meta-analysis of Nature walk as an intervention for anxiety and depression. Journal of clinical medicine. https://pmc.ncbi.nlm.nih.gov/articles/PMC8953618/
Increased walking can lessen depression. UCLA Health. (2025, January 29). https://www.uclahealth.org/news/article/increased-walking-can-lessen-depression
Mead, M. N. (2008, April). Benefits of sunlight: A bright spot for human health. Environmental health perspectives. https://pmc.ncbi.nlm.nih.gov/articles/PMC2290997/
The health benefits of sunshine (and how much you need per day). Cleveland Clinic. (n.d.). https://health.clevelandclinic.org/how-much-sunshine-you-need-daily
