A Pitcher’s Park No More

When Target Field first opened in 2010, something unexpected quickly became evident. Although the park’s dimensions were somewhat modeled after the Metrodome, and the intent of Target Field was to be a ballpark that evenly favored both hitter and pitcher, everyone noticed that Target Field had seemingly become Petco Park Midwest. You didn’t need ESPN’s Park Factors to know that it was extremely difficult to hit the ball over the fence at 1 Twins Way, though Park Factors did confirm what we could see on FSN. Target Field’s HR park factor was 0.682, which demonstrated that Minneapolis was the hardest city to homer in all of MLB. To give you an idea of how this park factor is calculated, it’s:

((Home HRS + Home HRA) / Home G) / ((Away HRS + Away HRA) / Away G)

Home HRS = HR hit at home
Home HRA = HR allowed at home
Away HRS = HR hit away
Away HRA = HR allowed away
Home G = Home games
Away G = Away games

Thus, a HR park factor of 1.000 meant that in a team’s season (say, the Twins), they would have hit and allowed an equal number of home runs both at home and on the road. Being less than 1.000, Target Field allowed significantly fewer home runs than all other ballparks combined that the Twins played in during the 2010 season, and thus had the appearance that it was a pitcher’s park.

While the home runs hit (or failed to be hit) at Target Field got all the press, many people conveniently ignored many other offensive stats at Target Field. Despite the dearth of big flies, Target Field allowed just slightly fewer runs than those other ballparks the Twins occupied in 2010 (0.962), it was virtually even in hits allowed (0.996), and was actually above average in doubles and triples (1.097 and 1.171, respectively). Although many of us argued that those home runs in the Metrodome were turning into outs at Target Field, in actuality they were turning into outs and doubles and triples.

In 2011, it was a different story, though it still painted Target Field in a negative light, at least from a hitter’s point of view. The ballpark was starting to trend more into the even field that was intended, but it still wasn’t entirely there. Target Field was still under 1.000 for runs (0.944), home runs (0.913), and now doubles and triples (0.930 and 0.943, respectively), while the hits were again virtually even (1.010). Thus, Target Field was still a pitcher’s park, but now only slightly.

This brings us to this season, and with the exception of the home runs, Target Field has actually started leaning towards being a hitter’s ballpark. That’s right. Take a look as Target Field has evolved since 2010 (MLB ranks are in parentheses).

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2 Responses to “A Pitcher’s Park No More”

  1. Anonymous Says:

    Park factors often vary from season to season. The hitters change, the pitchers change, the weather changes, the opposition parks use for comparison change and there are a bunch of other factors that vary. Like any statistic, small sample sizes have large random variations.

    But the truth is that “park factors” are not fixed relative to the players who play in them. As an example, a park may favor a particular kind of left handed batter or right handed batter. It takes a long time to get an accurate picture of how they effect the “average” batter and then a ten year or more “average” doesn’t mean much in the context of a single season, much less in terms of a single team or player. You really can’t accurately quantify the effects.

  2. Ed Bast Says:

    For the first 2 years TF was interestingly less cavernous to visiting teams than the hometown nine. Now it’s starting to even out. I attribute this almost primarily to Willingham and Plouffe, i.e. 2 guys relatively new to the club and thus less inured to the whiny, coddled, country-club mentality that is the hallmark of the modern Twins. The guys that complained so much that the team cut down the CF pine trees, one of the most unique aspects of the park, just to appease them (lot of good that did). The Hammer has taken the almost incomprehensible (for a Minnesota sports team) approach of “don’t make excuses, just shut up and play”. Suddenly TF isn’t so cavernous after all.

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