Castle Rocks Geological Area Overlook is a scenic viewpoint in Cassia County, Idaho. It lies in or next to City Of Rocks National Reserve, so park hours, fees and rules apply. It sits roughly 46 km (29 mi) SSE of Burley.
From the National Park Service
From this rocky ridge, hikers can view the Stines Creek riparian area below and watch for birds and other wildlife; however, it is the Castle Rocks Geologic Area that dominates one’s attention. The towering spires and monoliths of the Almo Pluton fall within areas managed by the State Park, Bureau of Land Management, and Forest Service.
This topography results from crustal extension. As the crust is stretched, high angle faults develop. Along these faults, mountains uplift and valleys drop, creating the distinctive mountain ranges.
As rocky ranges rise, the newly exposed rock is immediately subjected to weatherin g and erosion. This rock is attacked by water, ice, wind, and other erosive agents, that have produced many of the geologic features visible today.
Text: National Park Service (public domain) — nps.gov.
Sunrise & sunset directions
At Castle Rocks Geological Area Overlook the sunrise point swings a long way through the year: about 57° (ENE) at the June solstice and 122° (ESE) in late December. Sunset moves from 303° (WNW) in June to 239° (WSW) in December, and the midday sun climbs to 71° in summer but only 24° in winter.
| Date | Sunrise | Azimuth | Sunset | Azimuth | Noon sun | Daylight |
|---|---|---|---|---|---|---|
| March equinox (Mar 20) | 7:39 AM | 90° E | 7:47 PM | 271° W | 48° | 12h 08m |
| June solstice (Jun 21) | 6:00 AM | 57° ENE | 9:15 PM | 303° WNW | 71° | 15h 15m |
| September equinox (Sep 22) | 7:23 AM | 89° E | 7:34 PM | 271° W | 48° | 12h 11m |
| December solstice (Dec 21) | 8:01 AM | 122° ESE | 5:07 PM | 239° WSW | 24° | 9h 06m |
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
Overlooks are about the sweep of the land, so low-angle light matters most: side-light at sunrise or sunset reveals ridges and texture that midday sun flattens.
| Month (15th) | Blue hour starts | Sunrise | Golden hour ends | Golden hour starts | Sunset | Blue hour ends | Daylight |
|---|---|---|---|---|---|---|---|
| January | 7:30 AM | 8:01 AM | 8:45 AM | 4:45 PM | 5:28 PM | 5:59 PM | 9h 27m |
| February | 7:03 AM | 7:32 AM | 8:11 AM | 5:29 PM | 6:08 PM | 6:36 PM | 10h 36m |
| March | 7:20 AM | 7:47 AM | 8:24 AM | 7:04 PM | 7:41 PM | 8:09 PM | 11h 54m |
| April | 6:26 AM | 6:55 AM | 7:32 AM | 7:38 PM | 8:16 PM | 8:45 PM | 13h 21m |
| May | 5:43 AM | 6:15 AM | 6:55 AM | 8:09 PM | 8:49 PM | 9:21 PM | 14h 34m |
| June | 5:24 AM | 5:59 AM | 6:41 AM | 8:31 PM | 9:13 PM | 9:48 PM | 15h 14m |
| July | 5:39 AM | 6:13 AM | 6:54 AM | 8:29 PM | 9:10 PM | 9:43 PM | 14h 57m |
| August | 6:13 AM | 6:43 AM | 7:22 AM | 7:59 PM | 8:37 PM | 9:07 PM | 13h 54m |
| September | 6:47 AM | 7:16 AM | 7:52 AM | 7:09 PM | 7:46 PM | 8:14 PM | 12h 31m |
| October | 7:20 AM | 7:48 AM | 8:26 AM | 6:16 PM | 6:54 PM | 7:23 PM | 11h 06m |
| November | 6:56 AM | 7:26 AM | 8:08 AM | 4:33 PM | 5:15 PM | 5:45 PM | 9h 49m |
| December | 7:25 AM | 7:57 AM | 8:42 AM | 4:19 PM | 5:04 PM | 5:36 PM | 9h 07m |
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 Castle Rocks Geological Area Overlook, the Milky Way core is visible in a dark sky from March through September. June gives the longest window (about 4.2 hours on a moonless night), and the core peaks around 19° 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 | — | -3° | — |
| February | Below 10° in darkness | — | 9° | — |
| March | 5:15 AM – 6:05 AM | 0.8 | 15° | SSE → SSE |
| April | 3:08 AM – 5:08 AM | 2.0 | 18° | SE → S |
| May | 1:17 AM – 4:07 AM | 2.8 | 19° | SSE → S |
| June | 11:27 PM – 3:37 AM | 4.2 | 19° | SSE → SSW |
| July | 11:17 PM – 2:17 AM | 3.0 | 19° | S → SSW |
| August | 10:25 PM – 12:15 AM | 1.8 | 18° | S → SSW |
| September | 9:22 PM – 10:12 PM | 0.8 | 15° | SSW → SSW |
| October | Below 10° in darkness | — | 9° | — |
| November | Below 10° in darkness | — | -2° | — |
| 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: 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 ≈ 21.88 mag/arcsec². Aurora needs roughly Kp 7.0+ 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 35% average cloud cover) and December as the cloudiest (72%). 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 | 63 | 59 | 74 | 85 | 98 | 104 | 107 | 102 | 101 | 90 | 73 | 56 |
| Low °F | -19 | 0 | 9 | 19 | 22 | 31 | 43 | 43 | 29 | 11 | -12 | -7 |
| Precip. (in) | 1.7 | 1.3 | 1.6 | 1.8 | 1.8 | 0.8 | 0.5 | 0.6 | 0.8 | 1.2 | 1.3 | 2.0 |
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 scenic viewpoint
- Use a telephoto (70–200 mm) to isolate layered ridges and light rays instead of shooting only wide.
- Check the sun azimuth for your date: front-light, side-light and back-light give three different pictures from the same rail.
- Haze builds in summer afternoons; mornings after a cold front are often the clearest.
- Stay behind barriers — many overlook edges are undercut or crumbly.
- A panorama of 3–5 vertical frames gives more resolution and a wider view without a fisheye look.
- Bring a spare battery — cold weather and long exposures drain them fast.
Season: Clear, dry air in autumn and after winter storms gives the longest views; summer adds wildflowers but also haze.
Suggested gear: Tripod, Telephoto lens, Graduated ND filter, Headlamp. 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 Castle Rocks Geological Area Overlook, closest first.
State Park
Rock FormationRock Formation
State Park
Mountain Peak
Natural ArchRock Formation
Hot Spring
Mountain PeakCampgrounds nearby (Recreation.gov)
- Smoky Mountain Campground6.0 km (3.7 mi)
- City Of Rocks Campground7.0 km (4.4 mi)
- Independence Lakes Campground10.1 km (6.3 mi)
- Lake Cleveland Campground - West Side21 km (13 mi)
- Twin Lakes Campground (Sawtooth)22 km (13 mi) · reservable
FAQ
When is the best time to photograph Castle Rocks Geological Area Overlook?
What time is golden hour at Castle Rocks Geological Area Overlook?
Where does the sun rise and set at Castle Rocks Geological Area Overlook?
Can you see the Milky Way from Castle Rocks Geological Area Overlook?
Do you need a permit to photograph at Castle Rocks Geological Area Overlook?
How far is Castle Rocks Geological Area Overlook from Burley?
Sources
Location data: National Park Service. 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.