[Peter_Spaeth]

ESPN analysis of Coors prominently mentions field size.

1. Coors Field, home to Colorado Rockies
Runs: 1.427, HR: 1.323, HR (RHB): 1.310, HR (LHB): 1.342
Dimensions: 347' (8')-390' (8')-415' (8')-375' (8')-350' (14')
Altitude: 5,186 feet; Open-air stadium; Grass field

It's the No. 1 run-scoring environment in baseball, but not merely due to the distance a baseball travels at the mile-high altitude (a common misconception). Coors' expansive outfield, creating the largest amount of fair territory in baseball, results in the game's best venue for hits of all kinds (1.247 factor) and second-best for extra-base hits (1.298), and the offensive benefits are mostly balanced for rightes and lefties. In addition, the effects of the altitude upon a pitched baseball -- breaking pitches won't break quite so sharply and it's more difficult to keep pitches down -- force an adjustment for the Rockies when traveling and their opponents when visiting, with the more frequent trips for Rockies players a logical explanation for their extreme home/road splits. Breaking down Coors' park factors into the Rockies' and their opponents' stats, from 2011-15, opponents had a 1.199 run and 1.244 home-run factor; the Rockies had 1.669 and 1.409. This is why it's a dangerous thing to extrapolate a departing Rockies hitter's road stats, like Corey Dickerson's career .249/.286/.410 triple-slash rates, to a full season elsewhere. Take those Coors visitors' park factors to heart, too, as fantasy owners are often quick to exaggerate its impact upon a visiting player.