Located in City and County of San Francisco, California, Bluff Lookout: Mantle Rocks Exposed is a scenic viewpoint. It lies in or next to Golden Gate National Recreation Area, so park hours, fees and rules apply. It sits roughly 6.0 km (3.7 mi) WNW of San Francisco.
From the National Park Service
From here you can see excellent examples of blue-green serpentinite rock. Serpentinite is metamorphosed mantle rock formed in subductions zones when water from the sinking ocean crust alters the surrounding mantle rocks. Because serpentinite is less dense than surrounding rocks, it makes its way to the surface along faults, like a cork rising up to float on water.
Protecting lands, encouraging diversity
Soils above serpentinite rocks are low in nutrients and contain metals toxic to plants. But some plants have adapted to these harsh conditions over the millennia, and some grow nowhere else. Rare native plants like the Franciscan manzanita and Presidio clarkia have adapted to the serpentine soil like the kind found along these cliffs. In contrast, many invasive species have a hard time growing here, one of many reasons to protect these lands.
Text: National Park Service (public domain) — nps.gov.
Sunrise & sunset directions
At Bluff Lookout: Mantle Rocks Exposed the sunrise point swings a long way through the year: about 59° (ENE) at the June solstice and 120° (ESE) in late December. Sunset moves from 301° (WNW) in June to 241° (WSW) in December, and the midday sun climbs to 76° in summer but only 29° in winter.
| Date | Sunrise | Azimuth | Sunset | Azimuth | Noon sun | Daylight |
|---|---|---|---|---|---|---|
| March equinox (Mar 20) | 7:14 AM | 90° E | 7:22 PM | 271° W | 52° | 12h 08m |
| June solstice (Jun 21) | 5:49 AM | 59° ENE | 8:36 PM | 301° WNW | 76° | 14h 47m |
| September equinox (Sep 22) | 6:58 AM | 89° E | 7:08 PM | 271° W | 52° | 12h 10m |
| December solstice (Dec 21) | 7:23 AM | 120° ESE | 4:55 PM | 241° WSW | 29° | 9h 33m |
Azimuth is measured clockwise from true north (90° = east, 270° = west). Computed for 2026; values change by less than a degree from year to year.
Golden hour & blue hour by month
Overlooks are about the sweep of the land, so low-angle light matters most: side-light at sunrise or sunset reveals ridges and texture that midday sun flattens.
| Month (15th) | Blue hour starts | Sunrise | Golden hour ends | Golden hour starts | Sunset | Blue hour ends | Daylight |
|---|---|---|---|---|---|---|---|
| January | 6:56 AM | 7:25 AM | 8:05 AM | 4:35 PM | 5:15 PM | 5:44 PM | 9h 50m |
| February | 6:34 AM | 7:01 AM | 7:37 AM | 5:13 PM | 5:49 PM | 6:16 PM | 10h 49m |
| March | 6:56 AM | 7:22 AM | 7:57 AM | 6:43 PM | 7:17 PM | 7:44 PM | 11h 56m |
| April | 6:08 AM | 6:35 AM | 7:10 AM | 7:11 PM | 7:46 PM | 8:13 PM | 13h 10m |
| May | 5:31 AM | 6:01 AM | 6:38 AM | 7:36 PM | 8:13 PM | 8:43 PM | 14h 13m |
| June | 5:17 AM | 5:48 AM | 6:27 AM | 7:55 PM | 8:34 PM | 9:06 PM | 14h 46m |
| July | 5:30 AM | 6:01 AM | 6:39 AM | 7:54 PM | 8:32 PM | 9:03 PM | 14h 32m |
| August | 5:58 AM | 6:26 AM | 7:02 AM | 7:28 PM | 8:04 PM | 8:32 PM | 13h 38m |
| September | 6:26 AM | 6:53 AM | 7:27 AM | 6:45 PM | 7:19 PM | 7:46 PM | 12h 27m |
| October | 6:52 AM | 7:19 AM | 7:54 AM | 5:58 PM | 6:34 PM | 7:00 PM | 11h 15m |
| November | 6:23 AM | 6:51 AM | 7:30 AM | 4:21 PM | 5:00 PM | 5:28 PM | 10h 09m |
| December | 6:50 AM | 7:19 AM | 8:00 AM | 4:12 PM | 4:53 PM | 5:22 PM | 9h 34m |
Local time (America/Los Angeles), including daylight saving time. Golden hour runs from about −4° to +6° solar altitude, so the morning golden hour begins during blue hour, before sunrise.
Milky Way & night sky
From Bluff Lookout: Mantle Rocks Exposed, the Milky Way core is visible in a dark sky from March through September. June gives the longest window (about 5.3 hours on a moonless night), and the core peaks around 23° above the southern horizon. Our light-pollution model puts the sky at about Bortle 8 (city sky), so expect visible sky glow; drive away from towns for better results.
| Month | Core visible (15th) | Hours | Max altitude | Direction |
|---|---|---|---|---|
| January | Below 10° in darkness | — | -1° | — |
| February | 5:08 AM – 5:28 AM | 0.3 | 13° | SE → SE |
| March | 4:15 AM – 5:45 AM | 1.5 | 20° | SE → SSE |
| April | 2:19 AM – 4:59 AM | 2.7 | 23° | SE → S |
| May | 12:18 AM – 4:08 AM | 3.8 | 23° | SE → S |
| June | 10:29 PM – 3:49 AM | 5.3 | 23° | SE → SW |
| July | 10:22 PM – 2:22 AM | 4.0 | 23° | SSE → SW |
| August | 9:42 PM – 12:22 AM | 2.7 | 23° | S → SW |
| September | 8:48 PM – 10:18 PM | 1.5 | 20° | SSW → SW |
| October | 8:01 PM – 8:21 PM | 0.3 | 13° | SW → SW |
| November | Below 10° in darkness | — | 1° | — |
| December | Below 10° in darkness | — | -19° | — |
Window when the galactic core is at least 10° high during astronomical darkness on the 15th of each month. Pick nights within a few days of the new moon. Plan exact nights with the Milky Way planner.
Estimated sky darkness: 8 Bortle 8 — City sky. Only bright constellations are visible; the sky glows orange or white. Modeled zenith brightness ≈ 18.35 mag/arcsec².
Weather & best season
Long-term NASA satellite data for this area show October as the clearest month (about 44% average cloud cover) and December as the cloudiest (59%). September is the warmest month and January the coldest, which matters for gear, snow access and how long batteries last at night.
Average cloud cover (%)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| High °F | 67 | 69 | 76 | 80 | 87 | 88 | 78 | 85 | 94 | 84 | 78 | 65 |
| Low °F | 36 | 40 | 41 | 43 | 45 | 48 | 51 | 53 | 51 | 47 | 39 | 36 |
| Precip. (in) | 3.4 | 3.7 | 2.9 | 1.6 | 0.6 | 0.2 | 0.1 | 0.1 | 0.1 | 1.0 | 2.2 | 4.4 |
Monthly climatology for the surrounding 1° grid cell from NASA POWER (MERRA-2). Mountain sites can be colder and cloudier than the cell average.
Photography tips for this scenic viewpoint
- Stay behind barriers — many overlook edges are undercut or crumbly.
- A panorama of 3–5 vertical frames gives more resolution and a wider view without a fisheye look.
- Blue hour after sunset is excellent for towns or roads below the viewpoint as lights come on.
- Arrive 30–45 minutes before sunrise or sunset to find a composition before the light peaks.
- Shoot RAW to keep the most latitude for high-contrast sunrise and sunset scenes.
Season: Clear, dry air in autumn and after winter storms gives the longest views; summer adds wildflowers but also haze.
Suggested gear: Tripod, Telephoto lens, Graduated ND filter, Headlamp. Work out exposures with the depth of field, ND filter and NPF rule calculators.
Permits, drones & access
National Park Service rules. Under federal law (54 U.S.C. 100905), still photography in National Park Service areas needs a permit only when it (1) takes place where members of the public are not allowed, (2) uses models, sets or props that are not part of the location's natural or cultural resources or administrative facilities, or (3) would cause the park to incur additional administrative costs to monitor the activity. Ordinary visitor and most landscape photography needs no permit. Commercial filming rules are separate and have changed in recent years — confirm current requirements with the park before a paid shoot.
Drones: Launching, landing or operating unmanned aircraft (drones) is prohibited in National Park Service units under a 2014 Superintendent's closure (36 CFR 1.5), except where a park has issued specific written approval. Flying from outside the boundary over park land can also violate park rules and disturb wildlife.
Nearby photo spots
Other locations within 25 km of Bluff Lookout: Mantle Rocks Exposed, closest first.
Lighthouse
Lighthouse
Beach
Beach
BeachBeach
Lighthouse
Lighthouse
LighthouseCampgrounds nearby (Recreation.gov)
- Rob Hill Group Campground575 m · reservable
- Kirby Cove Campground4.4 km (2.7 mi) · reservable
- Aquatic Park Cove, Black Point Overnight Anchoring, Sailing Vessels Only (Auxiliary Engine Ok)4.9 km (3.0 mi) · reservable
- Bicentennial Campground5.1 km (3.2 mi) · reservable
- Hawk Campground6.8 km (4.2 mi) · reservable
FAQ
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Sources
Location data: National Park Service. Sun, moon and Milky Way times are computed by LWPhoto Atlas for 2026. Climate: NASA POWER. Sky darkness is a population-based estimate (Walker's law), not a measurement. See data sources & licenses.