Sandy Glacier Caves is a cave in Clackamas County, Oregon. It sits roughly 21 km (13 mi) E of Mount Hood Village.
The Sandy Glacier Caves are a system of glacier caves within the ice of Sandy Glacier on Mount Hood, Oregon. They are thought to be the largest glacier caves in the lower 48 states of the United States. Surveys done in 2011 and 2012 have measured the system at over 1 mile in length or about 7,000 feet. The caves formed from internal glacial melting at what are the headwaters of the Muddy Fork river. As melting continues, the caves grow larger with their entrances melting their way up the glacier's slope. Eventually it is predicted the caves will be completely gone within 7 to 10 years once the interior melting has reached the surface of the glacier. During early summer, all three surveyed caves within the glacier are connected through perennial ice and are called the Snow Dragon Glacier Cave System. By late summer, the perennial ice melts away leaving only the disconnected glacier...From the Wikipedia article “Sandy Glacier Caves”, licensed under CC BY-SA 4.0.
Sunrise & sunset directions
At Sandy Glacier Caves the sunrise point swings a long way through the year: about 55° (NE) at the June solstice and 124° (ESE) in late December. Sunset moves from 306° (NW) in June to 237° (WSW) in December, and the midday sun climbs to 68° in summer but only 21° in winter.
| Date | Sunrise | Azimuth | Sunset | Azimuth | Noon sun | Daylight |
|---|---|---|---|---|---|---|
| March equinox (Mar 20) | 7:11 AM | 89° E | 7:20 PM | 271° W | 45° | 12h 09m |
| June solstice (Jun 21) | 5:19 AM | 55° NE | 8:59 PM | 306° NW | 68° | 15h 40m |
| September equinox (Sep 22) | 6:55 AM | 89° E | 7:06 PM | 271° W | 45° | 12h 11m |
| December solstice (Dec 21) | 7:44 AM | 124° ESE | 4:27 PM | 237° WSW | 21° | 8h 43m |
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
Caves are lit artificially — show caves have fixed lighting, so a fast lens and high ISO beat flash, which flattens formations.
| Month (15th) | Blue hour starts | Sunrise | Golden hour ends | Golden hour starts | Sunset | Blue hour ends | Daylight |
|---|---|---|---|---|---|---|---|
| January | 7:10 AM | 7:43 AM | 8:30 AM | 4:03 PM | 4:50 PM | 5:23 PM | 9h 07m |
| February | 6:39 AM | 7:09 AM | 7:51 AM | 4:53 PM | 5:35 PM | 6:05 PM | 10h 25m |
| March | 6:51 AM | 7:20 AM | 7:59 AM | 6:34 PM | 7:13 PM | 7:42 PM | 11h 53m |
| April | 5:51 AM | 6:22 AM | 7:02 AM | 7:13 PM | 7:53 PM | 8:24 PM | 13h 31m |
| May | 5:03 AM | 5:37 AM | 6:20 AM | 7:48 PM | 8:31 PM | 9:05 PM | 14h 53m |
| June | 4:41 AM | 5:19 AM | 6:04 AM | 8:12 PM | 8:58 PM | 9:35 PM | 15h 39m |
| July | 4:57 AM | 5:34 AM | 6:18 AM | 8:09 PM | 8:53 PM | 9:29 PM | 15h 19m |
| August | 5:36 AM | 6:09 AM | 6:50 AM | 7:35 PM | 8:16 PM | 8:48 PM | 14h 07m |
| September | 6:17 AM | 6:46 AM | 7:25 AM | 6:41 PM | 7:20 PM | 7:49 PM | 12h 34m |
| October | 6:54 AM | 7:24 AM | 8:04 AM | 5:43 PM | 6:23 PM | 6:53 PM | 10h 59m |
| November | 6:35 AM | 7:07 AM | 7:51 AM | 3:53 PM | 4:38 PM | 5:10 PM | 9h 32m |
| December | 7:07 AM | 7:41 AM | 8:30 AM | 3:36 PM | 4:25 PM | 4:59 PM | 8h 45m |
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 Sandy Glacier Caves, the Milky Way core is visible in a dark sky from April through August. June gives the longest window (about 3.0 hours on a moonless night), and the core peaks around 16° above the southern horizon. Our light-pollution model puts the sky at about Bortle 3 (rural sky), good enough for detailed Milky Way images.
| Month | Core visible (15th) | Hours | Max altitude | Direction |
|---|---|---|---|---|
| January | Below 10° in darkness | — | -4° | — |
| February | Below 10° in darkness | — | 7° | — |
| March | 5:12 AM – 5:32 AM | 0.3 | 12° | SSE → SSE |
| April | 3:12 AM – 4:22 AM | 1.2 | 15° | SSE → SSE |
| May | 1:12 AM – 3:22 AM | 2.2 | 16° | SSE → S |
| June | 11:35 PM – 2:35 AM | 3.0 | 16° | SSE → SSW |
| July | 11:18 PM – 1:18 AM | 2.0 | 16° | S → SSW |
| August | 10:13 PM – 11:23 PM | 1.2 | 14° | SSW → SSW |
| September | 9:02 PM – 9:22 PM | 0.3 | 12° | SSW → SSW |
| October | Below 10° in darkness | — | 7° | — |
| November | Below 10° in darkness | — | -3° | — |
| December | Below 10° in darkness | — | -20° | — |
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: 3 Bortle 3 — Rural sky. Some light domes sit on the horizon, but the Milky Way still looks complex overhead. Modeled zenith brightness ≈ 21.47 mag/arcsec². Aurora needs roughly Kp 6.0+ to show low on the northern horizon here.
Weather & best season
Long-term NASA satellite data for this area show July as the clearest month (about 25% average cloud cover) and January as the cloudiest (77%). July is the warmest month and December 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 | 61 | 60 | 74 | 80 | 90 | 93 | 99 | 96 | 96 | 83 | 64 | 57 |
| Low °F | -2 | 7 | 10 | 24 | 29 | 37 | 42 | 42 | 32 | 18 | 1 | 0 |
| Precip. (in) | 5.3 | 3.9 | 4.3 | 3.0 | 2.3 | 1.6 | 0.4 | 0.6 | 1.3 | 3.2 | 5.3 | 6.3 |
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 cave
- Many show caves restrict tripods on tours; ask in advance or bring a small beanbag.
- Use manual focus with focus peaking in low light.
- Never touch formations — skin oils stop their growth.
- Follow White-nose Syndrome decontamination rules where posted to protect bats.
- Shoot RAW to keep the most latitude for high-contrast sunrise and sunset scenes.
Season: Cave interiors stay at a constant temperature year-round; summer tours fill up, so book ahead.
Suggested gear: Fast lens (f/1.8–f/2.8), High-ISO camera, Small beanbag. Work out exposures with the depth of field, ND filter and NPF rule calculators.
Nearby photo spots
Other locations within 25 km of Sandy Glacier Caves, closest first.
Glacier
Glacier
National Forest
Mountain Peak
Wilderness Area
Glacier
Glacier
Waterfall
WaterfallCampgrounds nearby (Recreation.gov)
- Tilly Jane Guard Station5.7 km (3.5 mi) · reservable
- Kinnikinnick (Laurance Lake) Campground9.1 km (5.7 mi) · reservable
- Lost Creek9.3 km (5.8 mi) · reservable
- Still Creek9.5 km (5.9 mi) · reservable
- Riley Horse Campground11.2 km (7.0 mi) · reservable
FAQ
When is the best time to photograph Sandy Glacier Caves?
What time is golden hour at Sandy Glacier Caves?
Where does the sun rise and set at Sandy Glacier Caves?
Can you see the Milky Way from Sandy Glacier Caves?
Do you need a permit to photograph at Sandy Glacier Caves?
How far is Sandy Glacier Caves from Mount Hood Village?
Sources
Location data: Wikidata, Wikipedia. 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.