Sierra Madre, CA: how dark is the sky here?

Satellite radiance puts Sierra Madre in the rural band. Little local light dome. Most stars are visible; the Milky Way is faint but often findable away from town lights. That's brighter than 12.1% of the 3,206 US cities in this dataset.

This comes from a satellite measuring light radiating upward, not a person's eyes on the ground, so it isn't the same as a Bortle class, though the two track each other closely.

Where to go for a darker sky near Sierra Madre

The closest place in this dataset with a meaningfully darker sky is Banning, CA, roughly 68 miles away in a straight line, rated dark sky. Road distance will be more.

Banning, CA is itself still a measured city, not a designated dark-sky park, this only compares against the 3,206 places this dataset covers.

How Sierra Madre compares nationally

About 10,775 people live in Sierra Madre, CA, sized enough to appear in this dataset of 3,206 incorporated US cities. Sierra Madre places 388 of 3,206 cities in this dataset's darkest-to-brightest order.