In the 1970-80s most fields were the hard concrete astro turf........
Yeah I don't know when turf overtook grass as the preferred surface..
Just off the top of my head in 1980 the stadiums that had grass were:
Candlestick - San Francisco
LA Coliseum - Los Angeles
Oakland Coliseum - Oakland
Jack Murphy - San Diego
Tampa Bay - The Big Sombrero
Miami - Orange Bowl
Mile High - Denver
Arrowhead - KC
Memorial Stadium - Baltimore
Memorial Stadium - Cleveland
Soldier Field - Chicago
RFK - Washington DC
Green Bay
Fulton County - Atlanta
That's 14 of 28 .. I stopped there.. I may have missed a couple but you get the picture.. Most teams were still on grass in 1980.. 3 of the 4 expansion teams since 1980 have been grass.. JAX, Carolina, Cleveland .. Houston being the only exception. Most teams that play outdoors have tried to go grass. The ones that worry about weather went to FieldTurf.