Located in Elmore County, Idaho, Trinity Mountain is a mountain peak at about 2,880 m (9,449 ft) above sea level. The nearest town is Mountain Home, about 56 km (35 mi) away (Trinity Mountain lies NNE of town).
Trinity Mountain is the highest point in the Trinity Mountains, a subrange of the Boise Mountains in Boise National Forest, Idaho with a summit elevation of 9,451 feet (2,881 m). It is located 11.63 miles (18.72 km) from Steel Mountain, its line parent, giving it a prominence of 2,371 feet (723 m). Trinity Mountain is within the watershed of the South Fork Boise River.From the Wikipedia article “Trinity Mountain (Idaho)”, licensed under CC BY-SA 4.0.
Sunrise & sunset directions
At Trinity Mountain the sunrise point swings a long way through the year: about 56° (NE) at the June solstice and 123° (ESE) in late December. Sunset moves from 304° (NW) in June to 238° (WSW) in December, and the midday sun climbs to 70° in summer but only 23° in winter.
| Date | Sunrise | Azimuth | Sunset | Azimuth | Noon sun | Daylight |
|---|---|---|---|---|---|---|
| March equinox (Mar 20) | 7:46 AM | 90° E | 7:54 PM | 271° W | 46° | 12h 08m |
| June solstice (Jun 21) | 6:01 AM | 56° NE | 9:27 PM | 304° NW | 70° | 15h 26m |
| September equinox (Sep 22) | 7:30 AM | 89° E | 7:41 PM | 271° W | 47° | 12h 11m |
| December solstice (Dec 21) | 8:13 AM | 123° ESE | 5:09 PM | 238° WSW | 23° | 8h 56m |
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
Summits catch first and last light — alpenglow can turn rock pink or orange minutes before sunrise and after sunset while valleys stay in shadow.
| Month (15th) | Blue hour starts | Sunrise | Golden hour ends | Golden hour starts | Sunset | Blue hour ends | Daylight |
|---|---|---|---|---|---|---|---|
| January | 7:41 AM | 8:13 AM | 8:58 AM | 4:46 PM | 5:31 PM | 6:03 PM | 9h 18m |
| February | 7:12 AM | 7:41 AM | 8:21 AM | 5:32 PM | 6:12 PM | 6:42 PM | 10h 31m |
| March | 7:26 AM | 7:55 AM | 8:33 AM | 7:10 PM | 7:48 PM | 8:17 PM | 11h 53m |
| April | 6:30 AM | 7:00 AM | 7:38 AM | 7:47 PM | 8:25 PM | 8:55 PM | 13h 25m |
| May | 5:45 AM | 6:18 AM | 6:59 AM | 8:19 PM | 9:00 PM | 9:33 PM | 14h 43m |
| June | 5:25 AM | 6:01 AM | 6:44 AM | 8:42 PM | 9:26 PM | 10:01 PM | 15h 25m |
| July | 5:40 AM | 6:15 AM | 6:57 AM | 8:39 PM | 9:22 PM | 9:56 PM | 15h 07m |
| August | 6:16 AM | 6:47 AM | 7:27 AM | 8:07 PM | 8:47 PM | 9:18 PM | 14h 00m |
| September | 6:53 AM | 7:22 AM | 8:00 AM | 7:16 PM | 7:54 PM | 8:23 PM | 12h 32m |
| October | 7:28 AM | 7:56 AM | 8:35 AM | 6:21 PM | 7:00 PM | 7:29 PM | 11h 03m |
| November | 7:06 AM | 7:37 AM | 8:20 AM | 4:35 PM | 5:18 PM | 5:49 PM | 9h 41m |
| December | 7:36 AM | 8:09 AM | 8:56 AM | 4:20 PM | 5:07 PM | 5:39 PM | 8h 57m |
Local time (America/Boise), 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 Trinity Mountain, the Milky Way core is visible in a dark sky from March through September. June gives the longest window (about 3.8 hours on a moonless night), and the core peaks around 18° 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 | — | -4° | — |
| February | Below 10° in darkness | — | 8° | — |
| March | 5:34 AM – 6:14 AM | 0.7 | 14° | SSE → SSE |
| April | 3:29 AM – 5:09 AM | 1.7 | 17° | SSE → S |
| May | 1:33 AM – 4:13 AM | 2.7 | 18° | SSE → S |
| June | 11:47 PM – 3:37 AM | 3.8 | 18° | SSE → SSW |
| July | 11:34 PM – 2:14 AM | 2.7 | 18° | S → SSW |
| August | 10:37 PM – 12:17 AM | 1.7 | 17° | S → SSW |
| September | 9:32 PM – 10:12 PM | 0.7 | 14° | SSW → SSW |
| October | Below 10° in darkness | — | 8° | — |
| November | Below 10° in darkness | — | -2° | — |
| 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 ≈ 21.81 mag/arcsec². Aurora needs roughly Kp 6.5+ 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 26% average cloud cover) and December as the cloudiest (67%). 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 | 49 | 54 | 69 | 81 | 91 | 102 | 104 | 101 | 97 | 89 | 67 | 51 |
| Low °F | -12 | -4 | 1 | 11 | 22 | 30 | 40 | 37 | 27 | 14 | -9 | -15 |
| Precip. (in) | 2.8 | 2.2 | 2.5 | 1.8 | 1.7 | 1.1 | 0.4 | 0.4 | 0.7 | 1.4 | 2.3 | 3.6 |
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 peak
- Clouds around the summit add drama — a clear blue sky is often the least interesting condition.
- Photograph the peak from a lake, meadow or ridge at sunrise when the face that looks east lights up first.
- Long lenses compress ridgelines; shoot the peak from several miles away to make it look massive.
- Afternoon thunderstorms are common in summer at high elevations — plan summit hikes for early morning.
- Snow on the summit holds detail best when you expose for the highlights and lift shadows later.
- Shoot RAW to keep the most latitude for high-contrast sunrise and sunset scenes.
Season: Early summer keeps snow on the peaks with green valleys below; autumn adds aspen or larch color in many ranges.
Suggested gear: Telephoto lens, Lightweight tripod, Warm layers, Microspikes in shoulder seasons. Work out exposures with the depth of field, ND filter and NPF rule calculators.
Nearby photo spots
Other locations within 25 km of Trinity Mountain, closest first.
Campgrounds nearby (Recreation.gov)
- Big Roaring River Lake Campground2.7 km (1.7 mi)
- Big Trinity Cabin3.4 km (2.1 mi) · reservable
- Dog Creek (Id)12.7 km (7.9 mi) · reservable
- Elks Flat Campground12.8 km (7.9 mi) · reservable
- Pine Campground Boat Ramp18.2 km (11.3 mi)
FAQ
When is the best time to photograph Trinity Mountain?
What time is golden hour at Trinity Mountain?
Where does the sun rise and set at Trinity Mountain?
Can you see the Milky Way from Trinity Mountain?
Do you need a permit to photograph at Trinity Mountain?
How far is Trinity Mountain from Mountain Home?
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.