Tamalpais-Homestead Valley, CA — light pollution & stargazing
Tamalpais-Homestead Valley, California has a light-pollution rating of about Bortle 4 — a rural / suburban transition (good dark sky) — measured from VIIRS 2024 satellite night-lights at 2.0 nW/cm²/sr at the town center. The Milky Way is still visible overhead but washes out toward the horizon, and light domes are prominent. The brighter nebulae and star clusters are within easy reach of binoculars. Tonight's Moon phase, cloud cover, and aurora odds load live below, computed in your browser. This is a satellite upward-radiance proxy for planning, not a survey-grade sky-brightness measurement.
Stargazing in Tamalpais-Homestead Valley tonight
- Estimated Bortle class
- 4 of 9
- VIIRS radiance (town center)
- 2.0 nW/cm²/sr
- Naked-eye limiting mag.
- 6.1–6.5
- Milky Way
- visible, loses detail near the horizon
Rural / suburban transition. A satellite upward-radiance proxy for planning — not a survey-grade sky-brightness reading.
What you can see from Tamalpais-Homestead Valley
The Milky Way is still visible overhead but washes out toward the horizon, and light domes are prominent. The brighter nebulae and star clusters are within easy reach of binoculars.
Darker skies within reach
Tamalpais-Homestead Valley is already among the darkest towns tracked here — there's no meaningfully darker town nearby. You're in a good spot; just get away from local lights and let your eyes adapt.
Frequently asked questions
- Can you see the Milky Way from Tamalpais-Homestead Valley, CA?
- Yes. At about Bortle 4, the Milky Way visible, loses detail near the horizon from Tamalpais-Homestead Valley on a clear, moonless night away from local lights.
- How dark is the sky in Tamalpais-Homestead Valley?
- Tamalpais-Homestead Valley rates a rural / suburban transition — about Bortle 4, with a naked-eye limiting magnitude around 6.1–6.5. That comes from a VIIRS satellite night-lights reading of 2.0 nW/cm²/sr at the town center. It is a satellite proxy for planning, not a survey-grade measurement.
- Where is the nearest dark sky to Tamalpais-Homestead Valley?
- Tamalpais-Homestead Valley is already among the darkest towns tracked here, so there is no meaningfully darker town nearby — you're in a good spot.
- Can I see the aurora from Tamalpais-Homestead Valley tonight?
- It depends on tonight's space weather. The live panel on this page reads the current NOAA aurora forecast for your latitude, along with cloud cover and the Moon — most U.S. locations only see aurora during strong geomagnetic storms.
The darkness rating is measured from VIIRS satellite night-lights at the town center and is a proxy for planning, not a survey-grade sky-brightness measurement — and the darkest skies are usually a short drive out of any town. Tonight's Moon, cloud, and aurora figures are live third-party forecasts that can change. See the methodology for sources and limits.
More in California
See every town's darkness rating in California, learn to read the Bortle scale, or check tonight's Moon phase.