Boulder Glacier is a glacier in Whatcom County, Washington at about 2,378 m (7,802 ft) above sea level. It sits roughly 32 km (20 mi) SE of Peaceful Valley.
Boulder Glacier is located on the southeast slope of Mount Baker, a stratovolcano near the Pacific coast of North America in the Cascade Range of Washington. Boulder Glacier is the sixth largest on Mount Baker with an area of 1.3 square miles (3.4 km2). It flows from the summit crater between Grant Peak (10,781 ft (3,286 m)) and Sherman Peak (10,141 ft (3,091 m)) to about 5,000 ft (1,500 m). It is noteworthy for retreating 1,610 ft (490 m) between 1987 and 2008, leaving newly exposed rock and soil behind.From the Wikipedia article “Boulder Glacier (Washington)”, licensed under CC BY-SA 4.0.
Sunrise & sunset directions
At Boulder Glacier the sunrise point swings a long way through the year: about 52° (NE) at the June solstice and 126° (SE) in late December. Sunset moves from 309° (NW) in June to 234° (SW) in December, and the midday sun climbs to 65° in summer but only 18° in winter.
| Date | Sunrise | Azimuth | Sunset | Azimuth | Noon sun | Daylight |
|---|---|---|---|---|---|---|
| March equinox (Mar 20) | 7:11 AM | 89° E | 7:20 PM | 271° W | 41° | 12h 09m |
| June solstice (Jun 21) | 5:05 AM | 52° NE | 9:15 PM | 309° NW | 65° | 16h 10m |
| September equinox (Sep 22) | 6:55 AM | 89° E | 7:07 PM | 271° W | 41° | 12h 12m |
| December solstice (Dec 21) | 7:58 AM | 126° SE | 4:14 PM | 234° SW | 18° | 8h 15m |
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
Ice shows its blue best under overcast skies or in shade; bright sun turns glaciers white and flat.
| Month (15th) | Blue hour starts | Sunrise | Golden hour ends | Golden hour starts | Sunset | Blue hour ends | Daylight |
|---|---|---|---|---|---|---|---|
| January | 7:20 AM | 7:56 AM | 8:48 AM | 3:47 PM | 4:39 PM | 5:15 PM | 8h 43m |
| February | 6:44 AM | 7:16 AM | 8:01 AM | 4:43 PM | 5:28 PM | 6:01 PM | 10h 12m |
| March | 6:50 AM | 7:21 AM | 8:03 AM | 6:31 PM | 7:13 PM | 7:44 PM | 11h 51m |
| April | 5:44 AM | 6:17 AM | 6:59 AM | 7:16 PM | 7:59 PM | 8:32 PM | 13h 42m |
| May | 4:49 AM | 5:27 AM | 6:13 AM | 7:56 PM | 8:42 PM | 9:20 PM | 15h 16m |
| June | 4:22 AM | 5:04 AM | 5:54 AM | 8:23 PM | 9:13 PM | 9:55 PM | 16h 08m |
| July | 4:41 AM | 5:21 AM | 6:09 AM | 8:19 PM | 9:07 PM | 9:47 PM | 15h 46m |
| August | 5:26 AM | 6:01 AM | 6:45 AM | 7:40 PM | 8:24 PM | 8:59 PM | 14h 23m |
| September | 6:13 AM | 6:45 AM | 7:26 AM | 6:40 PM | 7:22 PM | 7:54 PM | 12h 37m |
| October | 6:56 AM | 7:28 AM | 8:11 AM | 5:36 PM | 6:19 PM | 6:51 PM | 10h 51m |
| November | 6:42 AM | 7:17 AM | 8:06 AM | 3:39 PM | 4:29 PM | 5:03 PM | 9h 12m |
| December | 7:17 AM | 7:55 AM | 8:50 AM | 3:17 PM | 4:12 PM | 4:49 PM | 8h 17m |
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 Boulder Glacier, the Milky Way core is visible in a dark sky from May through July. June gives the longest window (about 2.7 hours on a moonless night), and the core peaks around 12° 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 | — | -5° | — |
| February | Below 10° in darkness | — | 4° | — |
| March | Below 10° in darkness | — | 9° | — |
| April | 3:57 AM – 4:07 AM | 0.2 | 11° | SSE → SSE |
| May | 1:54 AM – 2:44 AM | 0.8 | 12° | SSE → S |
| June | 11:55 PM – 2:35 AM | 2.7 | 12° | SSE → SSW |
| July | 12:03 AM – 12:43 AM | 0.7 | 12° | S → SSW |
| August | 10:33 PM – 10:33 PM | 0.0 | 10° | SSW → SSW |
| September | Below 10° in darkness | — | 8° | — |
| October | Below 10° in darkness | — | 4° | — |
| November | Below 10° in darkness | — | -5° | — |
| 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 ≈ 21.64 mag/arcsec². Aurora needs roughly Kp 4.0+ 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 42% average cloud cover) and November as the cloudiest (76%). August 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 | 47 | 50 | 56 | 68 | 77 | 87 | 90 | 90 | 86 | 76 | 55 | 41 |
| Low °F | -20 | -17 | -12 | 1 | 16 | 28 | 34 | 35 | 24 | -2 | -17 | -20 |
| Precip. (in) | 9.5 | 6.5 | 7.5 | 4.8 | 3.6 | 3.0 | 1.3 | 1.7 | 3.4 | 7.2 | 10.7 | 9.1 |
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 glacier
- A polarizer deepens the blue of glacial ice and the turquoise of meltwater lakes.
- Include a person or boat for scale — glaciers are much larger than they look.
- Boat tours to tidewater glaciers offer calving shots; use fast shutter speeds and a telephoto.
- Never walk on a glacier without training and gear; crevasses hide under snow bridges.
- Check road and trail conditions with the managing agency before you go.
Season: Summer offers access; late summer exposes the most bare ice before new snow.
Suggested gear: Telephoto lens, Polarizer, Waterproof shell, Spare batteries (cold drains them). Work out exposures with the depth of field, ND filter and NPF rule calculators.
Nearby photo spots
Other locations within 25 km of Boulder Glacier, closest first.
Volcano
Mountain PeakVolcano
Glacier
Glacier
Glacier
GlacierWilderness Area
Fire LookoutCampgrounds nearby (Recreation.gov)
- Boulder Creek Campground9.6 km (5.9 mi) · reservable
- Park Creek Campground10.2 km (6.3 mi) · reservable
- Panorama Point Campground10.4 km (6.5 mi) · reservable
- Swift Creek Campground11.1 km (6.9 mi) · reservable
- Bayview Campground (Mt. Baker-Snoqualmie National Forest, Wa)13.6 km (8.4 mi) · reservable
FAQ
When is the best time to photograph Boulder Glacier?
What time is golden hour at Boulder Glacier?
Where does the sun rise and set at Boulder Glacier?
Can you see the Milky Way from Boulder Glacier?
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How far is Boulder Glacier from Peaceful Valley?
Sources
Location data: Wikidata, USGS GNIS / GeoNames, 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.