Let's just jump right in to the ratings of the major league ballparks from 2014.
| MLB Park Factors | |||||||
| RK | PARK NAME | RUNS | HR | H | 2B | 3B | BB |
| 1 | Coors Field (Denver, Colorado) | 1.50 | 1.39 | 1.32 | 1.22 | 1.90 | 1.05 |
| 2 | Chase Field (Phoenix, Arizona) | 1.15 | 1.19 | 1.05 | 1.08 | 1.79 | 0.94 |
| 3 | Target Field (Minneapolis, Minnesota) | 1.12 | 1.02 | 1.08 | 1.08 | 1.41 | 1.08 |
| 4 | Busch Stadium (St. Louis, Missouri) | 1.10 | 0.97 | 1.01 | 1.19 | 1.47 | 1.09 |
| 5 | Fenway Park (Boston, Massachusetts) | 1.07 | 0.72 | 1.07 | 1.52 | 0.86 | 1.17 |
| 6 | Nationals Park (Washington, D.C.) | 1.07 | 0.70 | 1.08 | 1.13 | 0.38 | 1.08 |
| 7 | Globe Life Park in Arlington (Arlington, Texas) | 1.05 | 0.96 | 0.98 | 0.80 | 2.17 | 0.97 |
| 8 | U.S. Cellular Field (Chicago, Illinois) | 1.05 | 1.05 | 1.01 | 1.00 | 1.10 | 1.05 |
| 9 | Rogers Centre (Toronto, Ontario) | 1.04 | 1.31 | 1.03 | 1.11 | 1.33 | 0.92 |
| 10 | O.co Coliseum (Oakland, California) | 1.02 | 0.90 | 1.02 | 1.11 | 1.20 | 1.05 |
| 11 | Kauffman Stadium (Kansas City, Missouri) | 1.01 | 0.84 | 1.01 | 1.04 | 1.07 | 0.95 |
| 12 | Marlins Park (Miami, Florida) | 1.01 | 0.79 | 0.99 | 1.03 | 1.92 | 0.95 |
| 13 | Minute Maid Park (Houston, Texas) | 1.01 | 1.17 | 1.01 | 1.05 | 1.45 | 0.96 |
| 14 | Comerica Park (Detroit, Michigan) | 1.00 | 1.01 | 0.98 | 0.80 | 1.83 | 1.02 |
| 15 | Tropicana Field (St. Petersburg, Florida) | 1.00 | 0.81 | 0.97 | 0.88 | 0.68 | 1.11 |
| 16 | Miller Park (Milwaukee, Wisconsin) | 1.00 | 1.14 | 0.97 | 0.86 | 0.52 | 0.98 |
| 17 | PNC Park (Pittsburgh, Pennsylvania) | 0.98 | 0.71 | 1.04 | 1.08 | 0.81 | 0.99 |
| 18 | Great American Ball Park (Cincinnati, Ohio) | 0.96 | 1.28 | 0.96 | 0.90 | 1.11 | 1.11 |
| 19 | Progressive Field (Cleveland, Ohio) | 0.95 | 1.08 | 0.98 | 1.03 | 0.53 | 0.96 |
| 20 | Yankee Stadium (New York, New York) | 0.95 | 1.47 | 1.01 | 0.88 | 0.53 | 0.96 |
| 21 | Turner Field (Atlanta, Georgia) | 0.94 | 1.12 | 0.97 | 0.83 | 0.63 | 1.01 |
| 22 | Oriole Park at Camden Yards (Baltimore, Maryland) | 0.93 | 0.94 | 0.98 | 0.94 | 0.64 | 1.00 |
| 23 | Wrigley Field (Chicago, Illinois) | 0.93 | 0.94 | 0.98 | 1.07 | 1.04 | 1.00 |
| 24 | Citizens Bank Park (Philadelphia, Pennsylvania) | 0.93 | 1.21 | 0.97 | 0.91 | 0.84 | 1.00 |
| 25 | AT&T Park (San Francisco, California) | 0.92 | 0.68 | 0.95 | 0.92 | 1.81 | 0.99 |
| 26 | Angel Stadium of Anaheim (Anaheim, California) | 0.92 | 0.84 | 0.98 | 0.99 | 0.55 | 0.92 |
| 27 | Dodger Stadium (Los Angeles, California) | 0.91 | 1.23 | 0.91 | 1.06 | 0.35 | 0.84 |
| 28 | Citi Field (New York, New York) | 0.85 | 0.96 | 0.92 | 1.04 | 0.67 | 0.98 |
| 29 | Petco Park (San Diego, California) | 0.83 | 0.81 | 0.92 | 0.91 | 0.96 | 1.06 |
| 30 | Safeco Field (Seattle, Washington) | 0.83 | 1.05 | 0.89 | 0.79 | 0.47 | 0.88 |
***To read the above: A mark over 1.00 can be read as a positive percentage for the offense. As an example, a mark of 1.18 means the park played at a rate that was 18 percent better than the league average. A mark of 0.96 would mean the stadium was four percent below the league average.
Park Factors compares the rate of stats at home vs. the rate of stats on the road.
A rate higher than 1.000 favors the hitter. Below 1.000 favors the pitcher. Teams with home games in multiple stadiums list aggregate Park Factors.
FORMULA
PF: ((homeRS + homeRA)/(homeG)) / ((roadRS + roadRA)/(roadG))
homeRS: Runs scored at home
homeRA: Runs allowed at home
homeG: Home games
roadRS: Runs scored on the road
roadRA: Runs allowed on the road
roadG: Road games
Ballpark Factors are definitely something worth noting when drafting and tracking free agent moves, 
but it is also important not to let them change your position too much on certain players. Great hitters will hit anywhere no matter the environment, but the pitchers (to me) are the ones that could have the most variance depending on where they are pitching. For example, pitchers with a big fly ball tendency could perform better in bigger ballparks or parks where the ball does not carry that well (i.e. Dodger Stadium at night). Then there is, of course, Coors Field, which seems to have to gone back to the days of the late 1990s and early 2000s when everyone seemed to have no problem hitting there. The rating factors for both runs and home runs of a park should be noted but not a final determining factor in drafting any particular player.
This table reflects ESPN’s rating of the park factors for runs scored, extra base hits and walks. Coors Field saw 50 percent more runs scored than the MLB average across all stadiums. This was a significant jump from the 27 percent more per game we saw at Coors in 2013. It is unlikely Coors will be at the 50 percent clip better than average once again. It interesting to note that three of the top six ballparks in runs scored were Target Field in Minnesota (3rd), Busch Stadium in St. Louis (4th) and Nationals Park in Washington, D.C. (6th). These are all considered pitcher friendly parks, with Nationals Park even being at 30 percent below the MLB average for home runs hit.
There are three different stadiums that saw some drastic differences in runs scored from 2013 vs. 2014. Wrigley Field in Chicago was 2nd in 2013 and dropped down to 23th in 2014. There are weather patterns on the north side of Chicago that can dictate a baseball game more so than any other stadium in the majors. The differences this past season also have more to do with improved pitching as well. Citizens Bank Park in Philadelphia dropped to 24th in 2014 after being at 3rd in 2013. Citizens Bank still played favored the home run, though, at 20 percent above average. Oriole Park at Camden Yards in the Baltimore fell to 22nd in 2014 after being 10th in 2013, the biggest difference being home runs, which were down significantly (home runs were 27 percent above average in 2013 but fell to six percent below average in 2014).
The top home runs parks from 2014 are Yankee Stadium at 47 percent above average, Coors Field at 39 percent and the Rogers Centre in Toronto at 31 percent. The most unusual part of that is Yankee Stadium surrenders the most home runs but was still five percent below average in runs. It will be interesting to see how the big hitter additions in San Diego workout. Of Justin Upton, Matt Kemp and Wil Myers, Myers may see the least amount of change in home run rates. Tropicana Field in Tampa is the closest in home run rate at 20 percent below average, while Dodger Stadium was rather friendly at 20 percent above average and Turner field is at 10 percent above average.
The Ball Park Factors are something you should give some consideration to when drafting like players who may have changed teams or when targeting younger players. Great players are still going to be great and bad players are still going to be bad, so don’t get too crazy in breaking it down. These factors will have a much greater effect in Daily Fantasy Baseball than they will in the season-long leagues.