A park factor measures how much a ballpark raises or lowers offense compared with a neutral park, and 100 is neutral. On Baseball Savant's 2024 park factors, which cover the 2022 to 2024 seasons, Coors Field comes in at 112, the highest in baseball, and its runs index is 125. T-Mobile Park in Seattle is the lowest at 91. A hitter's season line can't tell you where tonight's game is being played or which hand tonight's starter throws with, and both change what you should expect from them.
Coors Field's 2024 park factor on Savant is 112
Savant's headline "Park Factor" is built on wOBA, so it rates the whole offensive environment, and by default it rolls three seasons together so one weird year can't swing it. Next to it, Savant breaks out an index for each result. These five parks come from the 2024 leaderboard.
| Park | Park factor | Runs | Hits | Home runs |
|---|---|---|---|---|
| Coors Field (Rockies) | 112 | 125 | 116 | 109 |
| Fenway Park (Red Sox) | 107 | 114 | 109 | 98 |
| Great American Ball Park (Reds) | 105 | 110 | 102 | 128 |
| Petco Park (Padres) | 96 | 92 | 96 | 104 |
| T-Mobile Park (Mariners) | 91 | 83 | 90 | 96 |
If you want 2024 on its own, Savant's one-year figure for Coors is 110. The 2025 update, covering 2023 to 2025, is 112 again, and Coors tops all three of those lists. Denver sits a mile up: a row of third-deck seats at Coors is painted purple because it's exactly 5,280 feet above sea level, per MLB.com.
Under the headline number, the parks play differently. Coors adds more hits than homers: 16% more hits than a neutral park, nearly twice as many triples, and only 9% more home runs. It also cuts strikeouts by 11%, which matters for a pitcher's strikeout pick. Great American Ball Park runs the other way, with ordinary hit totals and 28% more homers. Petco holds runs down while still giving up a few more homers than average. For a power bat, the home run column matters more than the headline, and barrel rate tells you how much power the hitter brings to it.
Savant also splits these indexes by the hitter's side, which ties the park to the matchup. Over 2022 to 2024, Great American Ball Park's home run index was 142 for left-handed hitters and 120 for right-handed ones. Dodger Stadium leaned the other way, at 116 for lefties and 126 for righties (Savant, left-handed hitters).
A hitter's line carries the home park
In 2025, Rockies hitters batted .270 with a .330 wOBA over 3,022 plate appearances at Coors. Everywhere else they hit .203 with a .260 wOBA over 2,886, according to Savant's Statcast search filtered by home and road.
Hunter Goodman shows it in one player. He hit .307 at home with a .366 BABIP, and .248 on the road with a .291 BABIP. He also hit more of his home runs away from Coors, 18 of his 31 (Savant). That matches Savant's indexes: Coors mostly turns balls in play into hits, so his average rode the park while his power traveled. It's also why his wOBA beat his contact-based xwOBA by 37 points in 2025, since xwOBA doesn't know which park a ball was hit in.
OPS+ takes the park out of OPS
OPS is on-base percentage plus slugging percentage, raw. OPS+ compares a hitter's on-base and slugging to the league's, adjusts for their ballparks, and sets 100 as league average, so 150 means 50% better than average. The formula is 100 × (OBP ÷ league OBP + SLG ÷ league SLG − 1), with the park adjustment applied (MLB.com). MLB.com's own example is Miguel Cabrera in 2014, whose .895 OPS worked out to a 150 OPS+.
FanGraphs' version is wRC+, built on wOBA with the same 100-is-average scale and the same park adjustment. MLB.com's glossary uses Coors against T-Mobile Park to explain it, and says a hitter's wRC+ and OPS+ for a season will almost always look very similar (MLB.com).
Goodman and Bryce Harper finished 2025 with the same OPS, .843 and .844, and nearly the same wOBA, .359 and .361. FanGraphs has Harper's wRC+ at 130 and Goodman's at 119 (FanGraphs). With their raw production that close, the 11-point gap is mostly Coors.
Most hitters do better against the opposite hand
The FanGraphs library calls this a platoon split: most lefty hitters do better against righties, and most righty hitters do better against lefties. How big it gets depends on which side the hitter bats from. These are 2025's numbers from Savant's Statcast search, grouped by the batter's side and the pitcher's hand.
| Matchup (2025) | Plate appearances | wOBA | Strikeout rate |
|---|---|---|---|
| Lefty batter vs righty pitcher | 65,310 | .324 | 21.5% |
| Lefty batter vs lefty pitcher | 15,249 | .292 | 24.0% |
| Righty batter vs lefty pitcher | 34,498 | .313 | 22.2% |
| Righty batter vs righty pitcher | 67,869 | .307 | 22.5% |
Left-handed hitters lost 32 points of wOBA against lefties, while right-handed hitters lost only 6 against righties. Lefty batters also faced a lefty in fewer than one of every five trips, so their season lines are built mostly against right-handers. When a lefty takes the mound, check the hitter's split before you trust the season number.
One season's split can mislead
Splits need more data than a season usually gives them. FanGraphs notes that a split over 300 total plate appearances probably holds only 75 to 100 against lefties, which isn't enough to tell you much, and that a big split over 1,500 plate appearances has a good chance of meaning something. It also says most research has found that batter-versus-pitcher history doesn't predict future matchups.
Two 2025 lefties show why. Nathaniel Lowe had a .330 wOBA against righties and .228 against lefties, a 102-point gap on 171 plate appearances against lefties. Over 2022 to 2025, with 745 of them, his gap was 27 points. Jarren Duran's 2025 gap was 104 points, and over the same four seasons it was still 85, on 530 plate appearances against lefties (Savant). So Lowe's 2025 split was mostly noise, while Duran's has held up for four seasons. For more on when a number is ready to trust, see how many at-bats before you can trust a stat.
The same pick looks different in two parks
Say a left-handed slugger shows up on your GAGE menu twice in one week. On Tuesday they're at Coors against a right-hander, and Total bases 2+ has a 45% chance, so YES scores +5.5 if it lands and loses 4.5 if it misses. On Friday they're in Seattle facing a lefty, and the same pick sits at 25%, which makes YES worth +7.5 if it lands and a loss of 2.5 if it doesn't.
In this example, both chances already reflect the park and the hand. Your job is to judge whether they reflect them enough. If this hitter's split against lefties over several seasons is small, like Lowe's, 25% may undersell them, and the +7.5 side deserves a look. If their split is Duran-sized, 25% might be generous. Seattle matters too: T-Mobile Park's runs index is 83 and its strikeout index is 115 on Savant's 2022 to 2024 numbers. Tuesday's Coors boost is mostly hits for a lefty: over the same years, the park's hits index for left-handed batters was 115 and its home run index was only 102.
Starters change, so check the lineup again before first pitch. If a lefty gets scratched for a righty after you've locked, decide whether your read still holds before you touch the pick. How scoring and lock-in work has the full rules, and you can make picks like these in GAGE on the App Store.