When most people think about climate resilience infrastructure, they picture seawalls, stormwater systems, and reinforced power grids. These are essential investments. But at TerraFuture, we have spent the past five years building evidence that community gardens represent a form of climate resilience that operates on a fundamentally different and complementary level.
Our network of 35 active community gardens across 47 Portland-area neighborhoods is not just producing food. It is producing measurable environmental and social outcomes that strengthen communities against the cascading effects of climate change.
The Carbon Story
Let us start with the numbers. In partnership with Oregon State University's College of Forestry, we conducted soil carbon sampling across 28 of our garden sites in 2025. The results were encouraging.
Garden soils sequestered an average of 2.4 metric tons of CO2 equivalent per acre per year, compared to 0.3 metric tons for comparable vacant lots and 0.8 metric tons for conventional urban lawns. The difference is driven by intensive composting practices, diverse plantings, and minimal soil disturbance in our no-till plots.
Across our total network footprint of 18.6 acres, that translates to approximately 44.6 metric tons of CO2 equivalent sequestered annually. While modest in absolute terms, this figure does not account for avoided emissions from reduced food transportation, decreased urban heat island effect, or improved stormwater infiltration.
We often frame carbon sequestration as something that happens at industrial scale. But distributed, community-managed green spaces are doing this work right in the neighborhoods that need climate benefits most.
Food Security in a Changing Climate
In 2025, our gardens produced an estimated 62,000 pounds of fresh produce. Of that total, 41 percent was donated to local food banks and mutual aid networks, providing nutritious food to approximately 3,200 households.
But the food security dimension extends beyond calories. Our gardens serve as living laboratories for climate-adapted agriculture. Gardeners are experimenting with drought-tolerant crop varieties, season extension techniques, and water-efficient irrigation systems that will become increasingly relevant as summers grow hotter and drier.
Three of our sites now operate year-round using low-cost hoop houses, producing cold-hardy greens through Portland's mild winters. This kind of distributed, small-scale food production builds genuine resilience into local food systems.
Stormwater and Urban Cooling
Each garden functions as a miniature green infrastructure installation. Our monitoring data shows that garden plots absorb 85 percent of rainfall events under 1.5 inches, compared to roughly 15 percent for paved surfaces and 45 percent for conventional lawns.
Temperature sensors placed in and around five of our largest gardens show an average cooling effect of 3.1 degrees Fahrenheit within a 200-foot radius of garden boundaries during peak summer heat. This hyperlocal cooling effect is modest but meaningful for adjacent residences, particularly in neighborhoods with limited tree canopy.
The Social Infrastructure of Resilience
Perhaps the most undervalued dimension of community gardens is their role in building social cohesion. Research consistently shows that communities with stronger social networks recover faster from climate disasters and adapt more effectively to ongoing environmental changes.
Our annual survey of garden participants reveals that 78 percent report knowing more of their neighbors since joining the garden, and 64 percent say they would feel comfortable asking another gardener for help during an emergency. These connections constitute a form of social infrastructure that no engineering project can replicate.
Scaling What Works
Based on five years of data, TerraFuture is preparing to launch an expanded garden network initiative targeting 15 new sites by 2028, with a focus on neighborhoods identified as high-vulnerability in our climate equity mapping. Each new site will incorporate standardized monitoring for carbon, stormwater, temperature, and social outcomes.
Community gardens will not solve the climate crisis on their own. But they represent a proven, community-driven intervention that delivers compounding benefits across environmental, social, and economic dimensions. The data supports scaling this approach significantly.
