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It also looks like that's Everett, not Memorial Stadium. Note the Mariners crest on the left field fence. Memorial Stadium is pictured here. -- http://www.milb.com/content/page.jsp?ymd=20090313&content_id=40997878&si...
But both are green. Boise's just takes more watering to make and keep it that way.
Also, though several of my kids live in Boise, I'm in Rockford, near Blackfoot, four hours away. Until recently, though, one of my daughters lived in an apartment complex behind the Garden City Library almost across from the Stadium.