Halvorson Hot Spring is a hot spring in Rosebud County, Montana at about 946 m (3,104 ft) above sea level. The nearest town is Forsyth, about 59 km (36 mi) away (Halvorson Hot Spring lies NNW of town).
Sunrise & sunset directions
At Halvorson Hot Spring the sunrise point swings a long way through the year: about 54° (NE) at the June solstice and 125° (SE) in late December. Sunset moves from 307° (NW) in June to 236° (SW) in December, and the midday sun climbs to 67° in summer but only 20° in winter.
| Date | Sunrise | Azimuth | Sunset | Azimuth | Noon sun | Daylight |
|---|---|---|---|---|---|---|
| March equinox (Mar 20) | 7:12 AM | 89° E | 7:20 PM | 271° W | 43° | 12h 09m |
| June solstice (Jun 21) | 5:14 AM | 54° NE | 9:06 PM | 307° NW | 67° | 15h 52m |
| September equinox (Sep 22) | 6:55 AM | 89° E | 7:07 PM | 271° W | 43° | 12h 12m |
| December solstice (Dec 21) | 7:50 AM | 125° SE | 4:23 PM | 236° SW | 20° | 8h 32m |
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
Steam is most visible on cold mornings; backlight from a low sun makes rising steam glow.
| Month (15th) | Blue hour starts | Sunrise | Golden hour ends | Golden hour starts | Sunset | Blue hour ends | Daylight |
|---|---|---|---|---|---|---|---|
| January | 7:15 AM | 7:49 AM | 8:38 AM | 3:58 PM | 4:46 PM | 5:21 PM | 8h 58m |
| February | 6:42 AM | 7:13 AM | 7:56 AM | 4:50 PM | 5:33 PM | 6:04 PM | 10h 20m |
| March | 6:51 AM | 7:21 AM | 8:02 AM | 6:33 PM | 7:13 PM | 7:44 PM | 11h 52m |
| April | 5:49 AM | 6:21 AM | 7:02 AM | 7:15 PM | 7:56 PM | 8:28 PM | 13h 35m |
| May | 4:58 AM | 5:34 AM | 6:18 AM | 7:52 PM | 8:36 PM | 9:12 PM | 15h 02m |
| June | 4:34 AM | 5:14 AM | 6:01 AM | 8:17 PM | 9:04 PM | 9:44 PM | 15h 50m |
| July | 4:52 AM | 5:29 AM | 6:15 AM | 8:13 PM | 8:59 PM | 9:37 PM | 15h 30m |
| August | 5:33 AM | 6:06 AM | 6:48 AM | 7:38 PM | 8:20 PM | 8:53 PM | 14h 14m |
| September | 6:16 AM | 6:46 AM | 7:26 AM | 6:41 PM | 7:21 PM | 7:52 PM | 12h 35m |
| October | 6:55 AM | 7:26 AM | 8:07 AM | 5:41 PM | 6:22 PM | 6:53 PM | 10h 56m |
| November | 6:38 AM | 7:11 AM | 7:58 AM | 3:49 PM | 4:35 PM | 5:08 PM | 9h 24m |
| December | 7:11 AM | 7:47 AM | 8:38 AM | 3:29 PM | 4:21 PM | 4:56 PM | 8h 34m |
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 Halvorson Hot Spring, the Milky Way core is visible in a dark sky from April through August. June gives the longest window (about 2.3 hours on a moonless night), and the core peaks around 14° 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 | — | -5° | — |
| February | Below 10° in darkness | — | 6° | — |
| March | 5:25 AM – 5:35 AM | 0.2 | 11° | SSE → SSE |
| April | 3:28 AM – 4:18 AM | 0.8 | 13° | SSE → SSE |
| May | 1:34 AM – 3:04 AM | 1.5 | 14° | SSE → S |
| June | 11:56 PM – 2:16 AM | 2.3 | 14° | SSE → SSW |
| July | 11:33 PM – 1:13 AM | 1.7 | 14° | S → SSW |
| August | 10:21 PM – 11:11 PM | 0.8 | 13° | SSW → SSW |
| September | 9:06 PM – 9:06 PM | 0.0 | 10° | SSW → SSW |
| October | Below 10° in darkness | — | 6° | — |
| November | Below 10° in darkness | — | -4° | — |
| 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 ≈ 21.94 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 41% average cloud cover) and December as the cloudiest (71%). 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 | 60 | 66 | 82 | 90 | 96 | 106 | 112 | 107 | 101 | 93 | 76 | 59 |
| Low °F | -18 | -15 | -25 | 11 | 25 | 35 | 48 | 42 | 31 | 7 | -5 | -15 |
| Precip. (in) | 0.4 | 0.5 | 0.7 | 1.7 | 3.2 | 2.5 | 1.4 | 1.3 | 1.3 | 1.2 | 0.5 | 0.5 |
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 hot spring
- Condensation forms quickly on lenses; let gear acclimate and carry a cloth.
- Keep to boardwalks and marked paths — crusts around thermal features can be thin and the water dangerously hot.
- A polarizer brings out the colors of mineral terraces and microbial mats.
- Respect bathers' privacy: ask before including people at soaking pools.
- Shoot RAW to keep the most latitude for high-contrast sunrise and sunset scenes.
Season: Winter gives the most dramatic steam; some primitive springs are only accessible in summer.
Suggested gear: Circular polarizer, Lens cloth, Telephoto for distant pools. Work out exposures with the depth of field, ND filter and NPF rule calculators.
Nearby photo spots
Other locations within 25 km of Halvorson Hot Spring, closest first.
FAQ
When is the best time to photograph Halvorson Hot Spring?
What time is golden hour at Halvorson Hot Spring?
Where does the sun rise and set at Halvorson Hot Spring?
Can you see the Milky Way from Halvorson Hot Spring?
Do you need a permit to photograph at Halvorson Hot Spring?
How far is Halvorson Hot Spring from Forsyth?
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.