Analytics

MLB Park Factors Explained

The same player prop bet has a different expected value depending on where the game is played. Park factors quantify exactly how much each of the 30 MLB stadiums affects offensive production — and ignoring them is one of the most common and costly mistakes in prop betting.

What Are MLB Park Factors?

MLB park factors are multipliers that quantify how much a specific stadium inflates or suppresses offensive production relative to the league average (1.0). A run factor of 1.10 means 10% more runs are scored at that park than at an average stadium. A factor of 0.90 means 10% fewer. Park factors account for outfield dimensions, altitude, humidity, foul territory size, and prevailing wind patterns.

How to Use Park Factors for Player Props

Hits props: A run factor >1.05 means more balls are reaching the outfield and finding gaps. Favour hits Overs at Coors, Great American, and Citizens Bank Park.

Home run props: Use the HR-specific factor. Yankee Stadium (1.12×), Rogers Centre (1.08×), and American Family Field (1.08×) are premium HR environments. Oracle Park (0.85×) and Kauffman Stadium (0.85×) are the worst for HR Overs.

Strikeout props: The K-factor is smaller in magnitude than run/HR factors but still meaningful. Avoid Coors Field for pitcher strikeout Overs — the altitude reduces pitch movement.

Pitcher props (ERA/WHIP context): Never evaluate a pitcher's ERA in a vacuum. A 4.20 ERA pitcher at Oracle Park is performing like a 3.78 ERA pitcher at a neutral park. ProprStats applies park normalisation to all pitcher stat comparisons.

Park Factors — All 30 MLB Stadiums

StadiumTeamRun FactorHR Factor
Coors FieldCOL1.20×1.25×
Great American Ball ParkCIN1.10×1.20×
Citizens Bank ParkPHI1.08×1.10×
Chase FieldARI1.05×1.10×
Guaranteed Rate FieldCWS1.05×1.10×
Yankee StadiumNYY1.05×1.12×
Rogers CentreTOR1.03×1.08×
Wrigley FieldCHC1.03×1.05×
Braves ParkATL1.02×1.05×
Fenway ParkBOS1.04×1.01×
Minute Maid ParkHOU1.02×1.05×
American Family FieldMIL1.04×1.08×
Camden YardsBAL1.02×0.96×
Nationals ParkWSN1.01×0.99×
Progressive FieldCLE1.00×0.98×
Target FieldMIN0.99×0.95×
Globe Life FieldTEX0.99×0.97×
Kauffman StadiumKCR0.98×0.85×
Busch StadiumSTL0.97×0.92×
Angel StadiumLAA0.97×0.92×
Dodger StadiumLAD0.98×0.95×
Tropicana FieldTBR0.95×0.92×
PNC ParkPIT0.95×0.90×
Citi FieldNYM0.96×0.90×
Comerica ParkDET0.96×0.90×
T-Mobile ParkSEA0.94×0.90×
Petco ParkSDP0.94×0.90×
loanDepot ParkMIA0.94×0.88×
Oakland ColiseumOAK0.92×0.85×
Oracle ParkSFG0.92×0.85×

Factor >1.0 = hitter-friendly; <1.0 = pitcher-friendly. Source: ProprStats park factor database, calibrated from multi-year Statcast data.

Frequently Asked Questions

What are MLB park factors?

MLB park factors are multipliers that quantify how much a specific stadium inflates or suppresses offensive production compared to the league average (1.0). A run factor of 1.10 means 10% more runs are scored at that park than average. Park factors account for dimensions, altitude, humidity, and prevailing wind patterns. They are essential context for any hitting or pitching prop bet.

Which MLB stadium has the highest park factor?

Coors Field in Denver has the highest park factor in MLB, with a run factor of 1.20 and HR factor of 1.25. The high altitude (5,280 feet) reduces air resistance on batted balls, significantly increasing carry distance. This makes Coors Field the most extreme hitter-friendly environment in baseball — a major edge for Over bets on hits, home runs, and total bases.

Do park factors apply to pitcher strikeout props?

Yes, but the effect is smaller than for hitting props. Some parks have a K-factor (strikeout park factor) that reflects whether the environment helps or hurts strikeout generation. Enclosed, sea-level stadiums tend to maintain better pitch movement and produce slightly more Ks. High-altitude parks like Coors Field can reduce spin-based pitch movement, slightly suppressing K rates.

Should I bet differently at Coors Field?

Yes. Coors Field is the most significant park factor adjustment in MLB. Hits Overs, HR props, and total bases props are all elevated in value there. Conversely, pitcher strikeout props and ERA-based pitcher analysis need a significant discount at Coors — the altitude reduces pitch movement, making it harder for even elite pitchers to perform at their normal level.

Park factors applied automatically

ProprStats bakes park factor into every EdgeScore and projection. No manual lookup required.

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Park factors sourced from the ProprStats park factor database, calibrated from multi-year MLB Statcast data. Statistics current as of the 2026 MLB season.