Slumgullion Pass — a mountain pass in Hinsdale County, Colorado at about 3,462 m (11,358 ft) above sea level — is a classic subject for landscape photographers. The nearest town is Ouray, about 40 km (25 mi) away (Slumgullion Pass lies E of town).
Slumgullion Pass (elevation 11,530 ft (3,514 m)) is a mountain pass in southwestern Colorado traversed by State Highway 149 east of Lake City. The north side has the steepest grade of any continuously paved road in Colorado (9%), but the pass does not close often in winter because snowplows clear the route regularly during this season. It has a few switchbacks and tight spots, but other than that, most travelers will find it an easy, scenic route.From the Wikipedia article “Slumgullion Pass”, licensed under CC BY-SA 4.0.
Sunrise & sunset directions
At Slumgullion Pass 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 75° in summer but only 29° in winter.
| Date | Sunrise | Azimuth | Sunset | Azimuth | Noon sun | Daylight |
|---|---|---|---|---|---|---|
| March equinox (Mar 20) | 7:13 AM | 90° E | 7:21 PM | 271° W | 52° | 12h 08m |
| June solstice (Jun 21) | 5:47 AM | 59° ENE | 8:36 PM | 301° WNW | 75° | 14h 48m |
| September equinox (Sep 22) | 6:57 AM | 89° E | 7:07 PM | 271° W | 52° | 12h 10m |
| December solstice (Dec 21) | 7:22 AM | 120° ESE | 4:53 PM | 241° WSW | 29° | 9h 31m |
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
Mountain passes sit above valleys, so they reward sunrise and sunset with layered ridges, valley fog and long shadows.
| Month (15th) | Blue hour starts | Sunrise | Golden hour ends | Golden hour starts | Sunset | Blue hour ends | Daylight |
|---|---|---|---|---|---|---|---|
| January | 6:56 AM | 7:24 AM | 8:04 AM | 4:34 PM | 5:14 PM | 5:42 PM | 9h 49m |
| February | 6:33 AM | 7:00 AM | 7:36 AM | 5:12 PM | 5:48 PM | 6:15 PM | 10h 48m |
| March | 6:55 AM | 7:21 AM | 7:56 AM | 6:42 PM | 7:16 PM | 7:43 PM | 11h 55m |
| April | 6:07 AM | 6:34 AM | 7:09 AM | 7:10 PM | 7:45 PM | 8:12 PM | 13h 11m |
| May | 5:30 AM | 5:59 AM | 6:37 AM | 7:35 PM | 8:13 PM | 8:42 PM | 14h 13m |
| June | 5:15 AM | 5:47 AM | 6:26 AM | 7:55 PM | 8:34 PM | 9:05 PM | 14h 47m |
| July | 5:28 AM | 5:59 AM | 6:37 AM | 7:53 PM | 8:32 PM | 9:02 PM | 14h 33m |
| August | 5:57 AM | 6:25 AM | 7:01 AM | 7:28 PM | 8:04 PM | 8:32 PM | 13h 39m |
| September | 6:25 AM | 6:51 AM | 7:26 AM | 6:44 PM | 7:19 PM | 7:45 PM | 12h 27m |
| October | 6:52 AM | 7:18 AM | 7:54 AM | 5:57 PM | 6:33 PM | 6:59 PM | 11h 15m |
| November | 6:22 AM | 6:50 AM | 7:29 AM | 4:20 PM | 4:58 PM | 5:26 PM | 10h 08m |
| December | 6:49 AM | 7:19 AM | 8:00 AM | 4:10 PM | 4:51 PM | 5:21 PM | 9h 33m |
Local time (America/Denver), 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 Slumgullion Pass, 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 1 (excellent dark-sky site), which is excellent for astrophotography.
| Month | Core visible (15th) | Hours | Max altitude | Direction |
|---|---|---|---|---|
| January | Below 10° in darkness | — | -1° | — |
| February | 5:07 AM – 5:27 AM | 0.3 | 13° | SE → SE |
| March | 4:14 AM – 5:44 AM | 1.5 | 19° | SE → SSE |
| April | 2:18 AM – 4:58 AM | 2.7 | 23° | SE → S |
| May | 12:18 AM – 4:08 AM | 3.8 | 23° | SE → S |
| June | 10:30 PM – 3:50 AM | 5.3 | 23° | SE → SW |
| July | 10:23 PM – 2:23 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 | 8:00 PM – 8:20 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: 1 Bortle 1 — Excellent dark-sky site. The Milky Way casts faint shadows; zodiacal light and airglow are obvious. Modeled zenith brightness ≈ 21.92 mag/arcsec².
Weather & best season
Long-term NASA satellite data for this area show June as the clearest month (about 36% average cloud cover) and July as the cloudiest (55%). July 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 | 48 | 52 | 61 | 69 | 81 | 85 | 87 | 83 | 82 | 71 | 62 | 50 |
| Low °F | -31 | -20 | -13 | -3 | 11 | 23 | 33 | 32 | 13 | 2 | -20 | -28 |
| Precip. (in) | 1.9 | 2.0 | 1.4 | 1.7 | 1.4 | 0.7 | 2.2 | 2.2 | 2.4 | 1.8 | 1.8 | 2.2 |
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 mountain pass
- Check road status before driving: many high passes close seasonally or after storms.
- Look for the road itself as a leading line — switchbacks from above make strong compositions.
- Weather changes fast at elevation; carry layers even in summer.
- Summit pull-outs often face one direction; use the sun azimuth table to see whether sunrise or sunset suits the view.
- Scout in daylight if you plan to shoot at night or before sunrise.
Season: Summer and early autumn are the main season; winter visits depend on plowing and avalanche conditions.
Suggested gear: Telephoto lens, Tripod, Warm layers, Road-condition app. Work out exposures with the depth of field, ND filter and NPF rule calculators.
Nearby photo spots
Other locations within 25 km of Slumgullion Pass, closest first.
Scenic Viewpoint
Waterfall
Mountain PassWaterfallWaterfall
Wilderness Area
Ghost Town
WaterfallScenic ViewpointCampgrounds nearby (Recreation.gov)
- Deer Lakes (Co)4.8 km (3.0 mi) · reservable
- Williams Creek (Co)12.1 km (7.5 mi) · reservable
- Mill Creek Campground (Co)17.3 km (10.8 mi) · reservable
- Bristol Head Campground19.7 km (12.2 mi)
- River Hill28 km (18 mi) · reservable
FAQ
When is the best time to photograph Slumgullion Pass?
What time is golden hour at Slumgullion Pass?
Where does the sun rise and set at Slumgullion Pass?
Can you see the Milky Way from Slumgullion Pass?
Do you need a permit to photograph at Slumgullion Pass?
How far is Slumgullion Pass from Ouray?
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.