Several. Boise State and Parish Episcopal School in Dallas both have it.
Actually there are two, as off now West Hills High School in Santee, California has a blue turf football field. :)
New update: Check out UNH Chargers field and a new one in Barrow, Alaska. They are popping up everywhere.
Currently, there are 18 NFL Stadiums with a grass, natural grass mix, or grass/artificial fiber mix. The move has been towards some type of artificial turf or mix for many teams for a number of reasons, but the most obvious is maintenance and upkeep.
As an example, the Ravens stadium originally had natural grass (smelled great too). However, much of the field was trashed during filming of the movie "The Replacements", and had to be completely replaced. Given that the stadium is also used for other events, it was more cost effective to move to artificial turf.
It's also much easier to maintain during the colder and rainier months during the regular season.
Still, I miss that smell of natural grass during Ravens home games.
96.78 football fields.
528 American football fields.
3 football fields
22.58 American football fields.
88 football fields
187,475.2 American football fields.
369,600 American football fields.
About 37,813 US NFL football fields.
25 football fields can fit inside the pentagon
15 miles = 264 American football fields.
About 105 (105.876124933827422) US NFL football fields.
24 whole fields (US, NFL) with some room left over.