From central Montana the Milky Way's galactic core is visible in true darkness from April to July, with the longest viewing window in June. Below: monthly times, the next new moons, and the darkest photo locations in Montana ranked by our light-pollution model.
Core season
Apr–Jul
Best month
June
1.5 h window
Max core altitude
13°
above southern horizon
Dark locations
446
Bortle 1–3 (est.)
Milky Way core visibility in Montana by month
| Month | Core visible (15th) | Hours | Max altitude | Direction |
|---|---|---|---|---|
| January | — | — | -6° | — |
| February | — | — | 5° | — |
| March | — | — | 9° | — |
| April | 4:10 AM – 4:40 AM | 0.5 | 12° | SSE → SSE |
| May | 2:11 AM – 3:21 AM | 1.2 | 13° | SSE → S |
| June | 12:48 AM – 2:18 AM | 1.5 | 13° | SSE → S |
| July | 12:15 AM – 1:15 AM | 1.0 | 13° | S → SSW |
| August | 10:54 PM – 11:14 PM | 0.3 | 12° | SSW → SSW |
| September | — | — | 9° | — |
| October | — | — | 5° | — |
| November | — | — | -4° | — |
| December | — | — | -20° | — |
Computed for central Montana (47.88, -113.55) — core at least 10° high during astronomical darkness. Northern parts of the state see it lower and for less time.
Next new moons (darkest nights)
| Date | Time | Milky Way |
|---|---|---|
| Mon, Nov 09, 2026 | 12:02 AM | Core below horizon at night |
| Tue, Dec 08, 2026 | 5:52 PM | Core below horizon at night |
| Thu, Jan 07, 2027 | 1:24 PM | Core below horizon at night |
| Sat, Feb 06, 2027 | 8:56 AM | Core below horizon at night |
| Mon, Mar 08, 2027 | 2:29 AM | Core below horizon at night |
| Tue, Apr 06, 2027 | 5:51 PM | Core season |
| Thu, May 06, 2027 | 4:58 AM | Core season |
| Fri, Jun 04, 2027 | 1:40 PM | Core season |
| Sat, Jul 03, 2027 | 9:02 PM | Core season |
| Mon, Aug 02, 2027 | 4:05 AM | Core below horizon at night |
| Tue, Aug 31, 2027 | 11:41 AM | Core below horizon at night |
| Wed, Sep 29, 2027 | 8:36 PM | Core below horizon at night |
| Fri, Oct 29, 2027 | 7:36 AM | Core below horizon at night |
New moon times from the U.S. Naval Observatory, converted to local time. The 3–4 nights either side are also dark in the evening or morning.
Darkest photo locations in Montana
| Location | Type | County | Est. Bortle | Zenith mag/arcsec² |
|---|---|---|---|---|
| Waterton-Glacier International Peace Park | Dark Sky Place | Glacier County | 1 | 21.94 |
| Medicine Rocks State Park | State Park | Fallon County | 1 | 21.94 |
| Missouri Headwaters State Park | State Park | Gallatin County | 2 | 21.87 |
| Greycliff Prairie Dog Town State Park | State Park | Sweet Grass County | 1 | 21.92 |
| Tongue River Reservoir State Park | State Park | Big Horn County | 1 | 21.92 |
| Placid Lake State Park | State Park | Missoula County | 2 | 21.88 |
| Hell Creek Recreational Area | State Park | Valley County | 1 | 21.95 |
| Thompson Falls State Park | State Park | Sanders County | 1 | 21.91 |
| Sluice Boxes State Park | State Park | Cascade County | 2 | 21.89 |
| Yellow Bay State Park | State Park | Lake County | 2 | 21.85 |
| Rosebud Battlefield State Park | State Park | Big Horn County | 1 | 21.93 |
| Tower Rock State Park | State Park | Cascade County | 1 | 21.89 |
| Bird Woman Falls Overlook | Scenic Viewpoint | Flathead County | 1 | 21.93 |
| Bear Creek Overlook Point of Interest | Scenic Viewpoint | Ravalli County | 2 | 21.88 |
| Camas Creek Overlook | Scenic Viewpoint | Flathead County | 1 | 21.90 |
| Devils Canyon Overlook | Scenic Viewpoint | Carbon County | 1 | 21.92 |
| Gibson Overlook | Scenic Viewpoint | Teton County | 1 | 21.93 |
| Golden Overlook Mine | Scenic Viewpoint | Madison County | 1 | 21.93 |
| Lookout Point | Scenic Viewpoint | Gallatin County | 1 | 21.93 |
| McGee Meadow Overlook | Scenic Viewpoint | Flathead County | 1 | 21.89 |
Sky brightness is modeled from nearby town populations (Walker's law); terrain, altitude and local lighting can make real skies better or worse.
Certified dark sky places in Montana
Starting exposure for sharp stars (NPF rule)
| Sensor | Lens | Aperture | NPF max shutter | 500 rule |
|---|---|---|---|---|
| Full frame (35 mm) | 14 mm | f/2.8 | 19.6 s | 36 s |
| Full frame (35 mm) | 20 mm | f/2.8 | 13.8 s | 25 s |
| Full frame (35 mm) | 24 mm | f/2.8 | 11.5 s | 21 s |
| APS-C (Nikon, Sony, Fujifilm, Pentax) | 14 mm | f/2.8 | 15.4 s | 23 s |
| APS-C (Nikon, Sony, Fujifilm, Pentax) | 20 mm | f/2.8 | 10.8 s | 16 s |
| APS-C (Nikon, Sony, Fujifilm, Pentax) | 24 mm | f/2.8 | 9.0 s | 14 s |
| Micro Four Thirds | 14 mm | f/2.8 | 14.1 s | 18 s |
| Micro Four Thirds | 20 mm | f/2.8 | 9.8 s | 12 s |
| Micro Four Thirds | 24 mm | f/2.8 | 8.2 s | 10 s |
NPF = (35 × f-number + 30 × pixel pitch) ÷ focal length, using typical pixel pitch per format (24 MP FF, 24–26 MP APS-C, 20 MP MFT). Fine-tune for your camera with the NPF calculator.
Tips for Milky Way photography
- Shoot within a few days of the new moon, or after moonset / before moonrise.
- Use ISO 3200–6400 on modern full-frame sensors, f/1.8–f/2.8, and the NPF shutter time.
- Focus manually on a bright star with live view magnified, then lock the focus ring.
- Shoot a blue-hour or low-ISO foreground frame from the same tripod position and blend it later.
- Stack 10–20 frames to reduce noise, or use a star tracker for longer exposures.
- Check the darkest-location table above, then confirm the view to the south on the location's sun-path diagram.
FAQ
When is Milky Way season in Montana?
From about April to July the core is above the horizon during darkness; June gives the longest window.
Where is the best place to see the Milky Way in Montana?
Our darkest modeled locations include Waterton-Glacier International Peace Park, Medicine Rocks State Park, Missouri Headwaters State Park, Greycliff Prairie Dog Town State Park.
What time is the Milky Way visible tonight?
Use the Milky Way planner with your location for exact rise, transit and dark-window times.