Texas, USA · 29.13°N 103.24°W · 1140 m
Stargazing in Big Bend
The darkest measured sky in the contiguous United States.
- Sky quality
- Bortle 1 — pristine
- Clear nights a year
- —
- Best month overall
- January
- Milky Way core
- February–October
The Milky Way shows structure and casts a faint shadow; the zodiacal light and airglow are visible to the naked eye.
Key facts
- Sky quality
- Bortle 1 — pristineBortle class 1
- Best Milky Way season
- February–OctoberPeak month: April, core reaching 32°
- Darkness quality
- Good10.7 h of astronomical darkness at its darkest, in December
- Best month for astrophotography
- NovemberAbout 12.0 dark, moon-free, statistically clear nights
- Coordinates
- 29.1275, -103.24251140 m elevation · America/Chicago
Questions answered on this page
- Is tonight good for stargazing in Big Bend?
- Is the Milky Way visible from Big Bend?
- How many clear nights does Big Bend get each year?
- What is the best month for astrophotography in Big Bend?
- How many hours of true darkness does Big Bend get each month?
- How dark is the sky in Big Bend on the Bortle scale?
- When is the Milky Way core above the horizon from Big Bend?
- Should I drive somewhere darker than Big Bend?
Big Bend National Park has the least light pollution of any national park in the lower 48, and at 29° north the galactic core climbs far higher than it ever does from Europe or the northern United States. Both facts together make it one of the strongest Milky Way sites on the continent.
The trade-off is remoteness and heat. The nearest services are hours away, summer days are punishing, and the late-summer monsoon brings cloud. The prime window is March to early June and again in October and November.
Evergreen intelligence
The four questions people ask about Big Bend
Computed from astronomy for these coordinates and a full year of Sun and Moon geometry — not copied from anywhere.
- How many clear nights does Big Bend have?
- The cloud archive did not load for this location, so the clear-night count is unavailable right now. The darkness and Moon figures below are computed locally and remain valid.
- What is the best month for the Milky Way in Big Bend?
- April. The galactic centre clears 10° from February to October, and in April it reaches 32° while the sky is astronomically dark, with about 4.0 hours of usable core time a night.
- When is it darkest in Big Bend?
- December gives the most true darkness — an average of 10.7 hours a night with the Sun more than 18° below the horizon.
- When should I plan an astrophotography trip to Big Bend?
- November offers the most nights that are simultaneously dark, moon-free and statistically clear — about 12.0 of them. Book around the new Moon in that month and keep two spare nights; a single fixed date at any location is a coin toss.
Darkness calendar
Big Bend month by month
Astronomical darkness and Moon geometry are computed for these coordinates. Cloud figures are ten-year ERA5 daily means. Rating combines darkness, moon-free nights and clear-sky odds.
| Month | Astro darkness | Moon-free dark nights | Avg cloud | Clear nights | Milky Way core | Rating |
|---|---|---|---|---|---|---|
| Jan | 10.5 h | 22 | — | — | — | Good |
| Feb | 10.0 h | 21 | — | — | 17° max | Good |
| Mar | 9.3 h | 21 | — | — | 27° max | Good |
| Apr | 8.3 h | 20 | — | — | 32° max | Good |
| May | 7.4 h | 19 | — | — | 32° max | Good |
| Jun | 6.5 h | 20 | — | — | 32° max | Good |
| Jul | 7.0 h | 20 | — | — | 32° max | Good |
| Aug | 8.0 h | 20 | — | — | 32° max | Good |
| Sep | 8.8 h | 20 | — | — | 29° max | Good |
| Oct | 9.9 h | 22 | — | — | 19° max | Good |
| Nov | 10.5 h | 24 | — | — | — | Good |
| Dec | 10.7 h | 24 | — | — | — | Good |
"Moon-free dark nights" counts nights with at least two hours of astronomical darkness during which the Moon stays below the horizon. "Clear nights" is the share of days in the ERA5 record averaging under 30% cloud cover.
Practical
What Big Bend is actually good for
- Milky Way core at high altitude
- Deep-sky visual
- Astrophotography workshops
For a decision on a specific night rather than a season, the SnapCosmos Night Engine scores tonight and the next six nights from these coordinates — . The method, weighting and known limits are documented on the Night Engine page, and its measured accuracy is published here.
FAQ
Common questions about the sky in Big Bend
- Can you see the Milky Way in Big Bend?
- Yes. Big Bend sits at Bortle 1 — pristine, where the Milky Way is an obvious, structured band whenever the galactic centre is above the horizon and the Moon is down.
- When is the best time of year to stargaze in Big Bend?
- It depends on what you want to see, and the month-by-month table on this page ranks every month by hours of astronomical darkness, moon-free nights and ten years of cloud statistics for these exact coordinates.
- How dark does it get in Big Bend?
- Big Bend is at latitude 29.1°N, and this page computes the hours of true astronomical darkness — Sun more than 18° below the horizon — for every month of the year at that latitude.
- Is tonight a good night in Big Bend?
- The SnapCosmos Night Engine scores tonight for these coordinates against the coming week using live cloud forecasts, Moon geometry and darkness, and returns a single go, wait or skip recommendation.
Where these numbers come from
- Ten-year cloud-cover climatology and historical night rankingERA5 reanalysisECMWF / Copernicus Climate Change Service
- Hourly cloud cover, precipitation, humidity and visibility forecastsOpen-Meteo forecast and archive APIOpen-Meteo
- Sun, Moon and planet positions, rise and set times, twilight phasesAstronomy Engine (VSOP87 / ELP2000 series)Don Cross, after the IMCCE and JPL analytical theories
- Bortle class and sky-brightness context for each locationWorld Atlas of Artificial Night Sky Brightness (Falchi et al., 2016)Science Advances / Light Pollution Map
- Definitions of civil, nautical and astronomical twilight, and lunar phase conventionsAstronomical Applications DepartmentUnited States Naval Observatory
Figures on this page last recomputed .
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