Parks make communities healthier, wealthier, safer, and more connected. Their benefits reach well beyond recreation, touching everything from property values and stormwater management to children’s brain development and heat-related deaths. Here’s what the evidence actually shows.
Physical Activity and Chronic Disease
People who exercise in their local park have 47% higher overall physical activity levels than nearby residents who don’t use the park for exercise. Even those who simply walk in their park show 33% higher activity levels. That matters because people who don’t get enough physical activity face a 20 to 30% increased risk of death compared to those who do. Parks lower the barrier to movement by offering free, accessible space for walking, jogging, playing sports, or just moving around outdoors.
This is especially significant in low-income neighborhoods, where gym memberships and private recreation options are less accessible. A well-maintained park with walking paths and open fields can serve as the primary fitness infrastructure for an entire community.
Stress Reduction and Mental Health
Living near green space measurably lowers stress. Research in deprived urban neighborhoods in Scotland found that residents surrounded by more green space had lower perceived stress and healthier patterns of cortisol, the hormone your body releases in response to stress. Cortisol naturally peaks in the morning and declines throughout the day, and a steeper decline is a sign of healthy stress regulation. People living near more greenery showed exactly that pattern.
The effect was especially pronounced in women, whose cortisol levels were significantly healthier in greener neighborhoods. Men also benefited, with green space helping to blunt elevated cortisol. Visiting green environments outperforms indoor relaxation for stress recovery. One study found that gardening reduced cortisol more effectively than reading indoors, and forest visits consistently lowered both cortisol and pulse rates compared to time spent in built-up city environments.
Property Values and Local Tax Revenue
Parks raise the value of nearby homes, and the effect is substantial. Properties directly next to a passive, well-maintained park typically sell for about 20% more than comparable homes farther away. Two or three blocks out, the premium drops to around 10%, and it tapers to roughly 5% a few more blocks beyond that. The impact generally reaches 500 to 2,000 feet from the park’s edge in urban settings before leveling off.
Heavily used parks with lots of active recreation tend to work a bit differently. The noise and traffic can limit the price bump for immediately adjacent homes, but properties two or three blocks away still see premiums around 10%. Either way, higher property values translate directly into a larger local tax base, which funds schools, infrastructure, and public services. Parks, in other words, more than pay for themselves.
Cooling Cities and Saving Lives
Urban parks act as natural air conditioners. A large park of about 680 hectares (roughly 1,700 acres) can lower surrounding air temperatures by 0.6 to 2.8°C, with the cooling effect extending up to a full kilometer beyond the park boundary. Even a small park of just 3.4 hectares drops the temperature by 0.5°C in its vicinity, pushing cooler air nearly 400 meters outward.
This isn’t just about comfort. Cities with more green space consistently report fewer heat-related hospitalizations and deaths. Research across 97 U.S. cities found that existing tree cover reduced annual heat-related mortality by 543 deaths compared to a scenario with no trees. Increasing tree cover by just 10% could prevent an additional 83 to 247 deaths per year. One analysis estimated that roughly one in four lives currently lost during heat waves could be saved with more urban greenery. In Sydney, greening interventions reduced heat-attributable deaths by up to 11.7 per day during extreme events.
Stormwater and Flood Prevention
Every tree in a park is a small-scale water management system. A single deciduous tree intercepts 700 to 1,000 gallons of rainwater per year. Evergreens capture more than 4,000 gallons. Multiply that across an entire park, and the volume is enormous. A U.S. Forest Service study found that New York City’s street trees alone, not even counting park trees, reduced stormwater runoff by 890.6 million gallons annually. The average NYC street tree intercepted 1,432 gallons per year, while larger species like London plane trees captured nearly 3,000 gallons each.
That water absorption saves real money. New York’s street tree canopy provided $35.6 million in stormwater management value by reducing the load on drainage systems and treatment plants. Parks, with their dense tree cover and permeable soil, amplify this effect far beyond what street trees alone can achieve.
Children’s Cognitive Development
Growing up near green space appears to protect children’s brain development, particularly when it comes to attention and focus. A large Danish study following more than 800,000 children born between 1992 and 2007 found that kids who grew up in the least green areas had a 20% higher risk of being diagnosed with ADHD compared to those in the greenest neighborhoods, even after accounting for family income and other factors. For every measurable decrease in surrounding vegetation, ADHD risk ticked upward by about 3%.
Other studies reinforce the pattern. Children with more green space near their homes and schools score better on tests of attention and cognitive skills. Living closer to city parks is associated with fewer ADHD symptoms. And experimental research shows that children already diagnosed with ADHD experience reduced symptoms of inattention when they play in green settings rather than indoor or paved environments. Parks give kids something that structured indoor activities and screens cannot fully replace: an environment that restores attention rather than depleting it.
The Park Equity Gap
Not all communities benefit equally. In U.S. cities, neighborhoods with higher poverty rates and larger Black and Hispanic populations tend to have less total green space, even though they’re often physically close to a park. In principal urban centers, a 10 percentage point increase in poverty corresponds to a 1.72 percentage point reduction in green space coverage. A 10 percentage point increase in Black residents corresponds to a 0.30 percentage point reduction.
Proximity alone doesn’t tell the whole story. Parks in non-white neighborhoods tend to be smaller, less safe, less comfortable, and less well-maintained. They have weaker social ties among visitors and lower collective efficacy, which is the sense that neighbors look out for each other. So while a park may technically exist nearby, its quality may not deliver the health, economic, and social benefits that a well-resourced park provides. Closing this gap in park quality is one of the highest-leverage investments a city can make, given how many of the benefits described above compound in exactly the communities that currently have the least access to them.