BORTLE CLASS 2 / SKY KEY
Typical truly dark site
Very dark rural sky with strong Milky Way structure and only modest distant light domes.
2
HOW TO READ IT
One number is a sketch of the sky, not the whole night.
A Bortle class describes what the sky looks like under particular conditions. Walk across a large park, turn toward a town, add snow or smoke, and the view can change. Use the number to compare darkness quickly, then read the stop page for the horizon, headlights, access and everything else that decides whether the place actually works.
Colorado stops currently logged as Bortle 2
Chimney Rock National MonumentEstimated Bortle 2 from modeled sky-brightness/light-pollution data at the guide location. Bortle is observational, so treat this as roughly ±1 class until field checked. ↗Comanche National GrasslandEstimated Bortle 2 from modeled sky-brightness/light-pollution data at the guide location. Bortle is observational, so treat this as roughly ±1 class until field checked. ↗Dinosaur National MonumentEstimated Bortle 2 from modeled sky-brightness/light-pollution data at the guide location. Bortle is observational, so treat this as roughly ±1 class until field checked. ↗Great Sand Dunes National Park and PreserveEstimated Bortle 2 from modeled sky-brightness/light-pollution data at the guide location. Bortle is observational, so treat this as roughly ±1 class until field checked. ↗Gunnison Gorge National Conservation AreaEstimated Bortle 2 from modeled sky-brightness/light-pollution data at the guide location. Bortle is observational, so treat this as roughly ±1 class until field checked. ↗Marshall PassEstimated Bortle 2 from modeled sky-brightness/light-pollution data at the guide location. Bortle is observational, so treat this as roughly ±1 class until field checked. ↗Mesa Verde National ParkEstimated Bortle 2 from modeled sky-brightness/light-pollution data at the guide location. Bortle is observational, so treat this as roughly ±1 class until field checked. ↗Lake Fork Earth & Sky Center / SlumgullionEstimated Bortle 2 from modeled sky-brightness/light-pollution data at the guide location. Bortle is observational, so treat this as roughly ±1 class until field checked. ↗Starry Meadows / Rocky Mountain Star StareEstimated Bortle 2 from modeled sky-brightness/light-pollution data at the guide location. Bortle is observational, so treat this as roughly ±1 class until field checked. ↗State Forest State ParkEstimated Bortle 2 from modeled sky-brightness/light-pollution data at the guide location. Bortle is observational, so treat this as roughly ±1 class until field checked. ↗Steamboat Lake State ParkEstimated Bortle 2 from modeled sky-brightness/light-pollution data at the guide location. Bortle is observational, so treat this as roughly ±1 class until field checked. ↗UFO WatchtowerEstimated Bortle 2 from modeled sky-brightness/light-pollution data at the guide location. Bortle is observational, so treat this as roughly ±1 class until field checked. ↗Valley View Hot SpringsEstimated Bortle 2 from modeled sky-brightness/light-pollution data at the guide location. Bortle is observational, so treat this as roughly ±1 class until field checked. ↗