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Every park is measured against an average one. A park at 1.18× gives up that outcome 18% more often than average, and the card prints the same thing as +18%. A park at 0.92× gives it up 8% less often, and prints as −8%. An average park is 1.00×, or 0%.
Each number is per plate appearance, adjusted for who hit and pitched there, over up to three seasons of the park’s current layout, with this season counting most. A slugging home team does not make its own park look friendly, and a great rotation does not make it look tough.
Park factors reflect ballpark only — weather is shown separately and not included in these values.
HR — home run rate. XBH — extra-base hit rate (2B + 3B + HR). HIT — total hit rate (1B + 2B + 3B + HR).
Switch between All Hitters, vs Righties and vs Lefties. Each side is compared with the league average for hitters on that same side, so a park that helps left-handed hitters specifically — the short porch in right field at Yankee Stadium — shows up rather than being averaged away.
A team that moves its fences or plays in a new ballpark starts over from the change, so old seasons never blur the new shape. A new layout starts from a published estimate of the change, or from average when there is none, and its own games take over as they add up — by midseason they count for more. The line under each card says which seasons the numbers cover.
Wednesday · 12:10 PM
WSHAway
DETPark factors
HR
+1%
1.01×
XBH
0%
1.00×
HIT
-1%
0.99×
How this park compares with an average one. 1.00× is average.
2024–2026 · 17,273 plate appearances
Wednesday · 12:35 PM
TORAway
BALPark factors
HR
+9%
1.09×
XBH
+2%
1.02×
HIT
+1%
1.01×
How this park compares with an average one. 1.00× is average.
2025–2026 · 11,701 plate appearances
Wednesday · 2:45 PM
MINAway
SFPark factors
HR
-17%
0.83×
XBH
-6%
0.94×
HIT
-1%
0.99×
How this park compares with an average one. 1.00× is average.
2024–2026 · 17,592 plate appearances
Wednesday · 5:35 PM
TORAwayBALPark factors
HR
+9%
1.09×
XBH
+2%
1.02×
HIT
+1%
1.01×
How this park compares with an average one. 1.00× is average.
2025–2026 · 11,701 plate appearances
Wednesday · 5:40 PM
STLAway
PITPark factors
HR
-11%
0.89×
XBH
+4%
1.04×
HIT
+3%
1.03×
How this park compares with an average one. 1.00× is average.
2024–2026 · 17,998 plate appearances
Wednesday · 5:40 PM
MILAway
PHIPark factors
HR
+14%
1.14×
XBH
+3%
1.03×
HIT
+2%
1.02×
How this park compares with an average one. 1.00× is average.
2024–2026 · 17,521 plate appearances
Wednesday · 6:05 PM
TBAway
NYYPark factors
HR
+15%
1.15×
XBH
+5%
1.05×
HIT
-3%
0.97×
How this park compares with an average one. 1.00× is average.
2024–2026 · 17,358 plate appearances
Wednesday · 6:10 PM
CLEAway
BOSPark factors
HR
-11%
0.89×
XBH
+6%
1.06×
HIT
+5%
1.05×
How this park compares with an average one. 1.00× is average.
2024–2026 · 17,765 plate appearances
Wednesday · 6:15 PM
CINAway
ATLPark factors
HR
-1%
0.99×
XBH
-3%
0.97×
HIT
+2%
1.02×
How this park compares with an average one. 1.00× is average.
2024–2026 · 17,699 plate appearances
Wednesday · 6:40 PM
CWSAway
KCPark factors
HR
+10%
1.10×
XBH
+12%
1.12×
HIT
+6%
1.06×
How this park compares with an average one. 1.00× is average.
2026 · 5,623 plate appearances
Wednesday · 6:40 PM
MIAAway
CHCPark factors
HR
+6%
1.06×
XBH
-6%
0.94×
HIT
-3%
0.97×
How this park compares with an average one. 1.00× is average.
2024–2026 · 17,644 plate appearances
Wednesday · 7:05 PM
NYMAway
TEXPark factors
HR
-7%
0.93×
XBH
-4%
0.96×
HIT
-4%
0.96×
How this park compares with an average one. 1.00× is average.
2024–2026 · 17,447 plate appearances
Wednesday · 7:40 PM
ARIAway
COLPark factors
HR
+5%
1.05×
XBH
+18%
1.18×
HIT
+14%
1.14×
How this park compares with an average one. 1.00× is average.
2024–2026 · 18,374 plate appearances
Wednesday · 8:40 PM
LAAAway
ATHPark factors
HR
+14%
1.14×
XBH
+14%
1.14×
HIT
+9%
1.09×
How this park compares with an average one. 1.00× is average.
2025–2026 · 11,650 plate appearances
Wednesday · 9:10 PM
HOUAway
SEAPark factors
HR
-5%
0.95×
XBH
-12%
0.88×
HIT
-10%
0.90×
How this park compares with an average one. 1.00× is average.
2024–2026 · 17,105 plate appearances
Wednesday · 9:10 PM
SDAway
LADPark factors
HR
+19%
1.19×
XBH
+3%
1.03×
HIT
-2%
0.98×
How this park compares with an average one. 1.00× is average.
2024–2026 · 17,538 plate appearances
How each of the day’s ballparks treats home runs, extra-base hits and hits, with the weather for the game. Park effects are large and stable, and easy to forget once you are deep in a matchup.
HR, XBH and HIT compare the park with an average one, per plate appearance and adjusted for who hit and pitched there, over up to three seasons of its current layout, with this season counting most. +18% means that outcome happens 18% more often there; the smaller number says the same as a multiple, where 1.00× is average. Green favors hitters, red favors pitchers. A hard place to homer can still be a good place for doubles. Weather is not part of those numbers.