Located in Whatcom County, Washington, Lower Curtis Glacier is a glacier at about 1,725 m (5,659 ft) above sea level. It lies in or next to North Cascades National Park, so park hours, fees and rules apply. The nearest town is Peaceful Valley, about 41 km (25 mi) away (Lower Curtis Glacier lies ESE of town).
Lower Curtis Glacier is in North Cascades National Park in the U.S. state of Washington. Named for photographer Asahel Curtis, the glacier is in a cirque on the western slopes of Mount Shuksan. Lower Curtis Glacier is rapidly retreating and has a negative mass balance, meaning that the rate of snow and ice that is falling in the accumulation zone is less than that which is lost each year in the ablation zone. Between 1908 and 1984, the glacier experienced a loss of thickness by 45 meters (147 ft). Between 1984 and 2002, the glacier lost another 6 meters (19 ft) in thickness. Lower Curtis Glacier also lost 28% of its surface area between the end of the Little Ice Age (around 1850) and 1950. Between the years 1951 and 1979, the glacier actually lengthened by 245 meters (800 ft) but has retreated 184 m (600 ft) since 1985, partly due to the tongue of the glacier being on a steep...From the Wikipedia article “Lower Curtis Glacier”, licensed under CC BY-SA 4.0.
Sunrise & sunset directions
At Lower Curtis 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) | 7:10 AM | 89° E | 7:19 PM | 271° W | 41° | 12h 09m |
| June solstice (Jun 21) | 5:04 AM | 52° NE | 9:14 PM | 309° NW | 65° | 16h 10m |
| September equinox (Sep 22) | 6:54 AM | 89° E | 7:06 PM | 271° W | 41° | 12h 12m |
| December solstice (Dec 21) | 7:58 AM | 126° SE | 4:13 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 | 7:19 AM | 7:55 AM | 8:47 AM | 3:46 PM | 4:38 PM | 5:14 PM | 8h 43m |
| February | 6:43 AM | 7:15 AM | 8:00 AM | 4:43 PM | 5:28 PM | 6:00 PM | 10h 12m |
| March | 6:49 AM | 7:21 AM | 8:02 AM | 6:30 PM | 7:12 PM | 7:43 PM | 11h 51m |
| April | 5:43 AM | 6:16 AM | 6:59 AM | 7:16 PM | 7:58 PM | 8:31 PM | 13h 42m |
| May | 4:48 AM | 5:26 AM | 6:12 AM | 7:55 PM | 8:42 PM | 9:20 PM | 15h 16m |
| June | 4:21 AM | 5:03 AM | 5:53 AM | 8:22 PM | 9:12 PM | 9:55 PM | 16h 09m |
| July | 4:40 AM | 5:20 AM | 6:08 AM | 8:18 PM | 9:06 PM | 9:47 PM | 15h 46m |
| August | 5:25 AM | 6:00 AM | 6:44 AM | 7:40 PM | 8:24 PM | 8:58 PM | 14h 23m |
| September | 6:12 AM | 6:44 AM | 7:26 AM | 6:40 PM | 7:21 PM | 7:53 PM | 12h 37m |
| October | 6:56 AM | 7:27 AM | 8:11 AM | 5:35 PM | 6:18 PM | 6:50 PM | 10h 51m |
| November | 6:42 AM | 7:16 AM | 8:06 AM | 3:38 PM | 4:28 PM | 5:02 PM | 9h 11m |
| December | 7:17 AM | 7:54 AM | 8:49 AM | 3:16 PM | 4:11 PM | 4:48 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 Lower Curtis 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 2 (typical truly dark site), which is excellent for astrophotography.
| 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 | 3:56 AM – 4:06 AM | 0.2 | 11° | SSE → SSE |
| May | 1:53 AM – 2:43 AM | 0.8 | 12° | SSE → S |
| June | 11:54 PM – 2:34 AM | 2.7 | 12° | SSE → SSW |
| July | 12:02 AM – 12:42 AM | 0.7 | 12° | S → SSW |
| August | 10:32 PM – 10:32 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: 2 Bortle 2 — Typical truly dark site. The summer Milky Way shows rich structure; clouds look like black holes in the stars. Modeled zenith brightness ≈ 21.72 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
- Expose carefully: ice and snow fool meters into underexposure, so add +1 to +2 stops.
- 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.
- Tell someone where you're going in remote areas and carry the ten essentials.
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.
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 Lower Curtis Glacier, closest first.
Glacier
Mountain PeakGlacierGlacier
Mountain Peak
Glacier
Glacier
WaterfallWaterfallCampgrounds nearby (Recreation.gov)
- Shannon Creek Campground9.3 km (5.8 mi) · reservable
- Park Creek Campground10.3 km (6.4 mi) · reservable
- Silver Fir Campground10.5 km (6.5 mi) · reservable
- Swift Creek Campground10.8 km (6.7 mi) · reservable
- Panorama Point Campground11.7 km (7.2 mi) · reservable
FAQ
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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.