Located up against the north bank of the Ohio River, Great American Ball Park’s tight dimensions make for the most home-run-friendly venue in all of Major League Baseball.
Unlike many hitters parks, there isn’t one point in the outfield where the Cincinnati venue stands out as playing much shorter than average. Although the 12-foot fence in left makes that side of the field a bit less inviting, the entire outfield is in play for a cheap HR here and there. If you had to choose a spot to target, it would have to be right-center field which plays about 30-40$ better than the league average for home runs.
Partially offsetting home runs is a below-average rating in batter contact. According to the Ballpark Pal model, hitters are about 1.1% less likely to put the ball in play (after controlling for player skill). This could be due to a change in hitting approach as hitters may swing for the fences at GABP more than they normally would. It could also be due to some aesthetic aspect of the park such as the batter's eye.
The home run favorability of Great American Ball Park really is all about its dimensions as external factors aren’t particularly influential. Wind speed is below average (6 mph) and the park ranks 21st in wind receptiveness. The stadium sits at 683 ft above sea level and carry distance is just slightly above average. Overall, GABP ranks 17th for day-to-day variation, which is in the bottom half for fully outdoor stadiums.
