What is the availability and distribution of single-day environmental education field trip programs for adolescent students across the U.S.? We assessed the spatial accessibility to EE field trip programs for U.S. schools that serve grades 5-8 (ages 10-14) by (1) compiling a comprehensive national database of 2,930 EE providers that offer field trip programs, (2) identifying 89, 311 middle schools' locations, student populations, and relevant demographic information, and (3) calculating drive times between schools and EE provider locations using a high-performance computing cluster. We then used the integrated Floating Catchment Area method to calculate each school's relative spatial access to EE field trip providers. Results suggest that "spatial access" was highly spatially clustered, particularly around several geographic regions (coastal California metropolitan areas, the southern Rockies, northern Kentucky, North Carolina, the western shore of Lake Michigan, and the high-density, contiguous metropolitan areas of the Northeast). Spatial access was also strongly related to partisan lean and urbanity, with more rural, White, and Republican-leaning areas generally having significantly less spatial access to EE field trips.