United States · International Dark Sky Community
Stargazing at Fredericksburg, Texas
How dark this certified sky really is, how far it is from the nearest cities, a live seven-night forecast for the site itself, and the moon-free nights worth planning around. Official DarkSky International page ↗
How dark the sky really is at Fredericksburg, Texas
Modelled zenith brightness at the site's coordinates is 19.89 mag/arcsec², which maps to roughly Bortle 5 (what each level means). This is an approximation from the 2024 light-pollution atlas, not a field measurement — and it describes the single point DarkSky lists, not the darkest corner of the community.
Modelled zenith brightness puts this spot at Bortle 5 — a suburban sky where the Milky Way is only faintly visible at best. The international dark sky community designation recognises responsible lighting and education, not a pristine sky; the Moon, planets, double stars and bright clusters are the realistic targets, and the atlas value at the site centre may not reflect its darkest corners.
Getting to Fredericksburg, Texas
The nearest cities we publish guides for, with the direction to head and a rough drive estimate.
- From San Antonio
head north · 102 km straight-line · ≈132.6 km by road · ≈1.9 h · weekend trip
- From Austin
head west · 108.9 km straight-line · ≈141.6 km by road · ≈2 h · weekend trip
- From Dallas
head south-west · 341 km straight-line · ≈443.3 km by road · ≈5.1 h · weekend trip
Estimated from straight-line distance x a 1.3 road-detour factor and staged average speeds (40 km/h leaving town, 70 km/h regional, 95 km/h highway). It is a rough guide, not a routed drive time.
The next seven nights at Fredericksburg, Texas
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Plan the next 90 days at Fredericksburg, Texas
Moon-free dark windows are astronomy — computable years ahead. Cloud is not: beyond the 16-night forecast nobody knows the weather, and we won't pretend to. What five years of reanalysis can say is how often each month's nights actually stayed clear here.
- Nov 2–1514 moon-free nights58% of November nights here stayed clear (2021–2025)
- Dec 2–1413 moon-free nights49% of December nights here stayed clear (2021–2025)
- Dec 31 – Jan 1314 moon-free nights49% of December nights here stayed clear (2021–2025)
Clear nights by month, 2021–2025
- Jan63%
- Feb52%
- Mar50%
- Apr45%
- May45%
- Jun73%
- Jul69%
- Aug83%
- Sep90%
- Oct73%
- Nov58%
- Dec49%
Clearest months historically: September (90%), August (83%), June (73%); across the year 62% of nights with astronomical darkness stayed clear.
"Clear" = weighted cloud cover (low 0.5 / mid 0.3 / high 0.2) ≤ 20% across the night's astronomical darkness. ERA5 reanalysis via Open-Meteo Archive, 2021–2025 (CC BY 4.0) — historical frequency, not a forecast. Once a window comes within 16 nights, the live forecast above takes over.
Put Fredericksburg, Texas's dark-sky nights on your calendar
Every month has a stretch of nights when the Moon leaves the dark hours at Fredericksburg, Texas essentially moon-free. Subscribe once and each window lands in your own calendar, about a year ahead — no account, no email.
moon & darkness geometry only — cloud can't be known this far out; check the live forecast above when a window gets close
Questions people ask about Fredericksburg, Texas
- How dark is the sky at Fredericksburg, Texas?
- Modelled zenith brightness from the 2024 World Atlas of Artificial Night Sky Brightness puts Fredericksburg, Texas at about 19.89 mag/arcsec², roughly Bortle class 5. That is an approximation derived from satellite data, not a field measurement; it is certified by DarkSky International as an International Dark Sky Community.
- How far is Fredericksburg, Texas from San Antonio?
- About 102 km in a straight line, heading north from San Antonio. Using a 1.3 road-detour factor and staged average speeds that is roughly 132.6 km and 1.9 h of driving — an estimate, not a routed drive time.
- When is the next moon-free dark window at Fredericksburg, Texas?
- The next stretch of essentially moon-free dark hours runs Nov 2–15 (14 nights), computed from Moon phase and altitude with Skyfield and JPL DE440s. Cloud cannot be known that far ahead; the live seven-night forecast on this page shows real cloud cover once a window is close.
- What is the clearest month at Fredericksburg, Texas?
- Over 2021–2025, September (90%), August (83%), June (73%) had the highest share of nights with astronomical darkness that stayed clear (weighted cloud cover ≤ 20%); across the year it was 62%. ERA5 reanalysis via Open-Meteo — historical frequency, not a forecast.
Place name and coordinates: DarkSky International (reviewed 2026-07-15, data 2026-10-13). Light pollution: David Lorenz, World Atlas 2024 (EOG VIIRS, CC BY 4.0), approximate. Cloud: Open-Meteo.com (CC BY 4.0). Moon and darkness geometry: Skyfield + JPL DE440s, computed locally. Drive times are estimates, not routes.