Located in Ravalli County, Montana, Boulder Falls is a waterfall at about 1,672 m (5,486 ft) above sea level. It sits roughly 44 km (28 mi) SSW of Hamilton.
Sunrise & sunset directions
At Boulder Falls the sunrise point swings a long way through the year: about 54° (NE) at the June solstice and 124° (SE) in late December. Sunset moves from 306° (NW) in June to 236° (WSW) in December, and the midday sun climbs to 68° in summer but only 21° in winter.
| Date | Sunrise | Azimuth | Sunset | Azimuth | Noon sun | Daylight |
|---|---|---|---|---|---|---|
| March equinox (Mar 20) | 7:41 AM | 89° E | 7:50 PM | 271° W | 44° | 12h 09m |
| June solstice (Jun 21) | 5:48 AM | 54° NE | 9:32 PM | 306° NW | 68° | 15h 44m |
| September equinox (Sep 22) | 7:25 AM | 89° E | 7:37 PM | 271° W | 44° | 12h 12m |
| December solstice (Dec 21) | 8:16 AM | 124° SE | 4:56 PM | 236° WSW | 21° | 8h 39m |
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
Waterfalls photograph best in soft, even light: overcast days, deep shade, or the hour after sunrise before direct sun hits the water. Bright sun on white water blows highlights and adds harsh contrast.
| Month (15th) | Blue hour starts | Sunrise | Golden hour ends | Golden hour starts | Sunset | Blue hour ends | Daylight |
|---|---|---|---|---|---|---|---|
| January | 7:42 AM | 8:15 AM | 9:03 AM | 4:32 PM | 5:19 PM | 5:53 PM | 9h 04m |
| February | 7:10 AM | 7:41 AM | 8:23 AM | 5:22 PM | 6:04 PM | 6:35 PM | 10h 23m |
| March | 7:21 AM | 7:51 AM | 8:30 AM | 7:04 PM | 7:43 PM | 8:13 PM | 11h 52m |
| April | 6:21 AM | 6:52 AM | 7:32 AM | 7:44 PM | 8:24 PM | 8:55 PM | 13h 32m |
| May | 5:31 AM | 6:06 AM | 6:50 AM | 8:19 PM | 9:03 PM | 9:38 PM | 14h 56m |
| June | 5:09 AM | 5:47 AM | 6:33 AM | 8:44 PM | 9:30 PM | 10:08 PM | 15h 43m |
| July | 5:26 AM | 6:02 AM | 6:47 AM | 8:40 PM | 9:25 PM | 10:02 PM | 15h 23m |
| August | 6:05 AM | 6:38 AM | 7:19 AM | 8:06 PM | 8:47 PM | 9:20 PM | 14h 09m |
| September | 6:46 AM | 7:16 AM | 7:56 AM | 7:11 PM | 7:50 PM | 8:20 PM | 12h 34m |
| October | 7:24 AM | 7:54 AM | 8:35 AM | 6:12 PM | 6:53 PM | 7:23 PM | 10h 58m |
| November | 7:06 AM | 7:38 AM | 8:24 AM | 4:22 PM | 5:07 PM | 5:40 PM | 9h 29m |
| December | 7:38 AM | 8:13 AM | 9:03 AM | 4:04 PM | 4:54 PM | 5:28 PM | 8h 41m |
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 Boulder Falls, the Milky Way core is visible in a dark sky from April through August. June gives the longest window (about 2.8 hours on a moonless night), and the core peaks around 15° 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 | — | -4° | — |
| February | Below 10° in darkness | — | 7° | — |
| March | 5:43 AM – 6:03 AM | 0.3 | 12° | SSE → SSE |
| April | 3:43 AM – 4:53 AM | 1.2 | 14° | SSE → SSE |
| May | 1:44 AM – 3:44 AM | 2.0 | 15° | SSE → S |
| June | 12:09 AM – 2:59 AM | 2.8 | 15° | SSE → SSW |
| July | 11:50 PM – 1:50 AM | 2.0 | 15° | S → SSW |
| August | 10:44 PM – 11:44 PM | 1.0 | 14° | SSW → SSW |
| September | 9:32 PM – 9:42 PM | 0.2 | 11° | SSW → SSW |
| October | Below 10° in darkness | — | 6° | — |
| November | Below 10° in darkness | — | -3° | — |
| 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: 1 Bortle 1 — Excellent dark-sky site. The Milky Way casts faint shadows; zodiacal light and airglow are obvious. Modeled zenith brightness ≈ 21.93 mag/arcsec². Aurora needs roughly Kp 5.0+ 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 34% average cloud cover) and March as the cloudiest (76%). 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 | 43 | 47 | 63 | 72 | 82 | 89 | 98 | 94 | 89 | 81 | 63 | 42 |
| Low °F | -30 | -32 | -13 | 1 | 17 | 24 | 33 | 29 | 21 | -2 | -20 | -27 |
| Precip. (in) | 2.5 | 2.6 | 2.6 | 2.5 | 2.6 | 2.8 | 0.8 | 1.1 | 1.4 | 1.9 | 2.4 | 2.8 |
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 waterfall
- Spring snowmelt and the days after heavy rain give the strongest flow; late summer flow can drop to a trickle.
- Look for a foreground: a mossy boulder, a fallen log or the creek's leading lines make a stronger frame than the falls alone.
- Keep a microfiber cloth handy — spray drifts onto the lens, especially at the plunge pool.
- Bracket shutter speeds: 1/8 s, 1/2 s and 2 s give very different water textures and you can choose later.
- Tell someone where you're going in remote areas and carry the ten essentials.
Season: Peak flow is usually in late spring; autumn adds color around the falls, and winter can bring ice formations at colder locations.
Suggested gear: Tripod, Circular polarizer, 3–6 stop ND filter, Lens cloth, Waterproof footwear. Work out exposures with the depth of field, ND filter and NPF rule calculators.
Nearby photo spots
Other locations within 25 km of Boulder Falls, closest first.
Fire Lookout
Mountain Peak
Waterfall
Fire Lookout
Hot Spring
Mountain PassWaterfallCampgrounds nearby (Recreation.gov)
- Rombo10.8 km (6.7 mi) · reservable
- Medicine Point Lookout16.4 km (10.2 mi) · reservable
- Fales Flat Campground16.4 km (10.2 mi) · reservable
- Crazy Creek Campground19.3 km (12.0 mi)
- Warm Springs Campground21 km (13 mi)
FAQ
When is the best time to photograph Boulder Falls?
What time is golden hour at Boulder Falls?
Where does the sun rise and set at Boulder Falls?
Can you see the Milky Way from Boulder Falls?
Do you need a permit to photograph at Boulder Falls?
How far is Boulder Falls from Hamilton?
Sources
Location data: USGS GNIS / GeoNames. 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.