[aCookieMomster]

Chino Hills to:
San Bernardino: 35.6 miles
Fontana: 25 miles
Rancho Cucamonga: 19 miles
Claremont: 12 miles

And yes, within seeing distance, if the smoke isn't too thick.

[Ladypixel]

Those estimates seem off, at least based off of personal driving distance of that area and the knowledge of the roads and freeways 'round here. But hey, I don't exactly pay attention to distance as the crow flies when driving - that doesn't work well in this area. :)

I can tell you that Chino Hills is off of the 91 freeway, well south-southwest of the fire zone, which is along the 210 freeway, and that it is /not/ in visual range, as the Grand Prix fire cannot be seen at all anywhere west of Rancho Cucamonga at this point.