Clearlake.
The definitive guide to dark skies and celestial observation in Clearlake, CA. Verified using National Park Service and NASA Night Sky Network Clubs data.
Quick Guide for Clearlake
- Top Community Pick: Foxboro Park (~68.3 miles)
- Best Scientific Reading: Bortle 4.0 at Buckhorn Group Camp
- Local Experts: Robert Ferguson Observatory
- Verified Observations: 5 distinct spots
Stargazing in Clearlake is surprisingly rewarding if you know exactly where to set up your tripod. While enthusiasts often gather at Foxboro Park for its accessibility, scientific audits conducted by the National Park Service at Buckhorn Group Camp provide the most accurate reading of the regional sky quality, measuring at a Bortle 4.0. The transition between the urban infrastructure of Clearlake and the more rural stretches of CA creates several ‘dark sky’ corridors.
The Best Times for Stargazing in Clearlake
For the best results in Clearlake, aim for a ‘New Moon’ window. In these dark-sky conditions, the absence of moonlight allows the Milky Way to cast visible shadows.
Expert Tips for Clearlake Observers
When visiting Foxboro Park, remember to check if the gates close at sunset or if a night-use permit is required. For the best views at this spot, try to observe targets when they are highest in the sky to minimize atmospheric interference. Local enthusiasts often frequent this spot, making it a great place to meet experienced observers. Regardless of your gear, allow 30 minutes for your eyes to fully dark-adapt.
California Guide
Local Top Spots
Community-vetted locations known for clear horizons and accessibility for telescopes and astrophotography.
Foxboro Park
" Standard Advice: Dress in layers as temperatures drop quickly after sunset. Use a red-light flashlight to preserve your night vision. "
Mt. Tamalpais-Rock Springs
" Standard Advice: Dress in layers as temperatures drop quickly after sunset. Use a red-light flashlight to preserve your night vision. "
Museum of Science and Curiosity (MOSAC)
" Standard Advice: Dress in layers as temperatures drop quickly after sunset. Use a red-light flashlight to preserve your night vision. "
Three Rivers Charter School
" Standard Advice: Dress in layers as temperatures drop quickly after sunset. Use a red-light flashlight to preserve your night vision. "
DeJean Middle School
" Standard Advice: Dress in layers as temperatures drop quickly after sunset. Use a red-light flashlight to preserve your night vision. "
NPS Sky Measurements
Instrumented readings from the National Park Service Night Sky Program, providing the most accurate SQM and Bortle classifications.
Buckhorn Group Camp
Black Butte Lake RA
"Site on a knoll just northwest of the group camp, excellent monitoring site with easy access. Seeing excellent, transparency poor. Lingering smoke and haze from wildfire, humid. Despite high extinction, an excellent sky near the zenith, with the dark lane in the Cygnus star cloud visible. Northeast through south along the horizon has numerous bright light domes, the brightest of which definitely affects dark adaptation. Early evening sky is much brighter overhead than late, presumably because of outdoor lights being shut off, but airglow decrease also a factor. By early morning, the light domes are seen to extend to less than 45 degrees above the horizon, while in early evening to at least 60 degrees, with only a small area near the zenith lacking a distinct brightness gradient. SQM 21.44 at 9:30 PM (Sales), 21.77 (Duriscoe) 12:30 AM LMT."
Mt. Vision
Point Reyes NS
"Clear and dry, fog off shore. Very good extinction, and strong airglow"
International Dark Sky Parks
Premier locations certified for their exceptional dark sky quality and commitment to light pollution mitigation.
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Massacre Rim Wilderness Study Area
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Local Astronomy Clubs
Connect with experts and fellow enthusiasts through local astronomical societies and community groups.