How to Know if the Milky Way Will Be Visible Tonight Near You
Three things kill a Milky Way shoot before you even leave the house: cloud cover, moon phase, and light pollution. Most people check the first one and ignore the other two. A clear sky with a full moon overhead is nearly as bad as an overcast one — moonlight washes out the galactic core just like a city does. All three have to work together for the night to be worth it.
The StarCast score above factors in cloud cover, moon illumination and how long it's above the horizon that night, estimated light pollution for your location using the Bortle scale, humidity, and visibility. It combines all of that into a single 0–100 number. An 80+ is a genuine dark sky window. Below 50 and something significant is working against you — usually the moon or clouds.
The nearby scan exists because light pollution is uneven. Driving 30–50 miles out of a city can drop you two or three Bortle classes — the difference between a faint smear and a fully visible arch. If your local score is limited by Bortle and a location to the northwest is scoring meaningfully higher, that's the drive worth making.
Frequently Asked Questions
How does the dark sky finder work?
Enter your city and the tool scans 16 candidate locations in all compass directions within ~150 miles, scoring each on cloud cover, moon phase, estimated Bortle class, humidity, and visibility. The best-scoring sites are shown with links to their full Starcast forecast.
What is Bortle class and why does it matter?
The Bortle scale runs from 1 (pristine dark sky) to 9 (inner-city). At Bortle 7+, the Milky Way core is barely visible. Even driving 50 miles from a city can drop two or three Bortle classes — a dramatic improvement for faint nebula and galaxy work.
More on Bortle & A Milky Way Guide →
Does moon phase affect which location is best?
Yes. A full moon washes out faint objects regardless of how dark the sky otherwise is. This tool factors in current moon illumination when scoring each location, so all sites are compared under the same moon conditions.
How accurate is the Bortle estimate?
Bortle class is derived from the Falchi et al. (2016) World Atlas of Artificial Night Sky Brightness — a globally calibrated dataset based on VIIRS satellite data and over 35,000 ground-truth SQM readings. It models atmospheric light scatter rather than just upward radiance, making it accurate for suburban and rural locations. Dataset:
doi:10.5880/GFZ.1.4.2016.001 · CC BY-NC 4.0
When is Milky Way season, and where should I shoot it?
Milky Way season runs roughly March through October in the Northern Hemisphere, with the core at its highest and most photogenic from May through August. The best shooting windows fall in the few days around new moon each month — when the sky is darkest. Where to shoot it depends on your latitude and how far you can get from city light. This tool scans locations within 150 miles of you and scores them on Bortle class, cloud cover, and current moon phase, so you can find your best option for tonight.
Milky Way Season Guide →
What if my location already has the best skies nearby?
If no nearby site scores significantly higher than yours, the tool tells you. Stay put, set up your gear, and shoot.
Can I get a full astrophotography forecast for a result?
Yes — every result links directly to Starcast preloaded with that location, showing moon phase, Bortle class, seeing conditions, dark window timing, and a 10-day outlook.
Open StarCast →