"Nature in the City’s Green Hairstreak Corridor Open House and Bioblitz is a community-powered climate action event focused on biodiversity monitoring, habitat stewardship, and environmental education in San Francisco. Hosted in partnership with the global City Nature Challenge, this event mobilizes volunteers to document wildlife and contribute valuable data to long-term climate resilience efforts. The Green Hairstreak Corridor is a network of restored habitat sites designed to support the Climate-Sensitive Green Hairstreak butterfly and other native species. As climate change intensifies habitat fragmentation, rising temperatures, and shifting seasonal patterns, localized monitoring and restoration are critical. By gathering biodiversity data through a coordinated Bioblitz, this project strengthens our understanding of species distribution, phenology (timing of life cycles), and ecosystem health—key indicators of climate impacts. Anticipated Climate Outcomes: - Increased biodiversity data to inform adaptive habitat management in a changing climate - Improved understanding of pollinator activity and seasonal shifts - Strengthened urban habitat connectivity to support climate-resilient species - Expanded community knowledge and engagement in local climate solutions Volunteers play an essential role in advancing these outcomes. Participants will use the iNaturalist or Seek apps to record plant and animal observations throughout the Corridor. These observations contribute to both the international City Nature Challenge dataset and Nature in the City’s ongoing Green Hairstreak monitoring efforts. The data collected helps track butterfly populations, identify emerging threats (such as invasive species), and guide future restoration priorities. The event begins at Golden Gate Heights Park, where volunteers gather for orientation and preparation. Guided by expert naturalists, participants will join small-group walks through multiple habitat restoration sites. Along the way, volunteers will: - Identify and document native plants, pollinators, and other wildlife - Upload geotagged observations to iNaturalist or Seek - Learn how to distinguish native species from invasives - Observe and record sightings of the Green Hairstreak butterfly - Share findings during a group debrief highlighting total species counts and observations For those with limited time, a naturalist will also be stationed at the Corridor’s flagship butterfly restoration site at 15th Avenue and Quintara Street to support focused Green Hairstreak observations. Beyond data collection, this collaborative event nurtures environmental stewardship, builds climate literacy, and empowers residents to become active participants in urban ecosystem resilience. By connecting people directly to the landscapes they are helping to monitor and protect, the Green Hairstreak Corridor Bioblitz strengthens both ecological health and community climate leadership. Through collective observation and action, volunteers help create a more biodiverse, climate-resilient San Francisco—one butterfly, one plant, and one data point at a time. 🌿"