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Minor League Park Factors 2021

Polar Park Johntlumackigetty
(Photo by John Tlumacki/Getty Images)

New leagues. New teams. New affiliations. New schedules. In some cases, new parks—or at least novel arrangements.

The minor leagues in 2021 looked different than they did in 2019.

And we loved every second of it after the scuttled 2020 season.

With the new minor league landscape comes new minor league ballpark data. This post compares home output and road output for all 120 full-season minor league teams in 11 leagues to create basic park factors. The statistics measured are Runs, Home Runs and BABIP, or batting average on balls in play.

These basic park factors are expressed as both a comparison index, where 100 is average, and a multiplier that halves the magnitude of park factors to reflect the fact that players compile only half their statistics at their home parks.

It wouldn't be 2021 without caveats and distortions. Because schedules tended to be more regional this season than in the past, the "neutral" road sample is not as robust as in the past. Also, the sample is smaller. Rather than the standard 70 home games of the past, most Triple-A teams played 65 home games this season, while most teams at Double-A, High-A and Low-A played 60 home games.

Other caveats are noted as footnotes to each league.

Triple-A East

RunsHome RunsBABIP
TeamOrgPFMultPFMultPFMult
BuffaloTOR1021.012890.9451041.020
CharlotteCWS1131.0651351.1731061.032
ColumbusCLE1071.0351241.121960.982
DurhamTB1131.0641121.0601021.012
GwinnettATL1001.001880.9421051.025
IndianapolisPIT990.996840.9221000.999
IowaCHC1091.0451131.0671031.017
JacksonvilleMIA910.955830.913930.967
Lehigh ValleyPHI1101.052730.8661061.031
LouisvilleCIN970.9861081.038980.990
MemphisSTL1091.0431031.0131051.023
NashvilleMIL920.959740.8701021.008
NorfolkBAL840.919800.902920.960
OmahaKC900.952960.9801011.006
RochesterWSH890.944800.8991011.006
Scranton/Wilkes-BarreNYY890.9451171.084940.971
St. PaulMIN1051.0251421.208980.990
SyracuseNYM1131.0641291.1441001.000
ToledoDET940.970770.884980.991
WorcesterBOS990.9951181.088950.977


Buffalo played its home games in Trenton, N.J., in May, June and July before going back to Sahlen Field in August, when the Blue Jays returned to Toronto. Trenton played in the Double-A Eastern League in 2019 but was dropped from affiliated baseball when MLB took over the minor leagues.

Triple-A West

RunsHome RunsBABIP
TeamOrgPFMultPFMultPFMult
AlbuquerqueCOL1121.0591141.0721091.045
El PasoSD1241.1211271.1371071.033
Las VegasOAK1281.1411141.0701121.059
Oklahoma CityLAD830.916770.883950.974
RenoARI1061.0311091.0441011.003
Round RockTEX970.9851081.042970.984
SacramentoSF880.9391061.031930.967
Salt LakeLAA1061.0291001.0011071.033
Sugar LandHOU780.892700.849900.951
TacomaSEA850.923860.931900.948

Double-A Central

RunsHome RunsBABIP
TeamOrgPFMultPFMultPFMult
AmarilloARI1271.1331691.3431071.036
ArkansasSEA780.892580.789940.968
Corpus ChristiHOU930.9631141.071930.964
FriscoTEX1111.0551141.070950.976
MidlandOAK940.971590.7971151.074
Northwest ArkansasKC930.9651091.045970.984
San AntonioSD880.938640.820960.978
SpringfieldSTL1111.0531291.1431071.034
TulsaLAD1031.016970.983970.987
WichitaMIN1051.024940.9691001.000

Double-A Northeast

RunsHome RunsBABIP
TeamOrgPFMultPFMultPFMult
AkronCLE910.954700.849950.974
AltoonaPIT1001.002770.8831041.022
BinghamtonNYM950.973850.9251011.004
BowieBAL1221.1111351.174990.994
ErieDET900.951990.9931021.012
HarrisburgWSH940.9711081.039990.996
HartfordCOL1000.9981091.0431000.999
New HampshireTOR1031.013970.9831001.002
PortlandBOS1021.011890.9451031.014
ReadingPHI1151.0771501.2501021.010
RichmondSF920.961770.8861031.014
SomersetNYY990.9941171.087920.961

Double-A South

RunsHome RunsBABIP
TeamOrgPFMultPFMultPFMult
BiloxiMIL1031.0161051.025950.976
BirminghamCWS940.9721011.005980.992
ChattanoogaCIN1251.1251011.0031071.036
MississippiATL810.906530.766960.982
MontgomeryTB1071.0371071.0331041.018
PensacolaMIA920.960980.9921021.012
Rocket CityLAA940.9691351.175970.986
TennesseeCHC1071.0371141.0721011.003

High-A Central

RunsHome RunsBABIP
TeamOrgPFMultPFMultPFMult
BeloitMIA1161.0791101.0511021.009
Cedar RapidsMIN940.969790.894940.972
DaytonCIN1000.9991131.0641061.032
Fort WayneSD1041.0221081.0401051.023
Great LakesLAD940.972900.9481001.002
Lake CountyCLE990.9961411.207910.954
LansingOAK1241.1201081.0381061.030
PeoriaSTL870.9361041.021970.983
Quad CitiesKC920.961960.9811041.018
South BendCHC1021.008880.9381021.008
West MichiganDET850.927530.766910.955
WisconsinMIL1081.0401321.1581031.017

Beloit, Wis., moved into newly-built ABC Supply Stadium on Aug. 3 after spending nearly 40 years at Pohlman field.

High-A East

RunsHome RunsBABIP
TeamOrgPFMultPFMultPFMult
AberdeenBAL930.965730.8661000.998
AshevilleHOU1381.1881411.2041171.084
Bowling GreenTB930.966970.985990.996
BrooklynNYM800.898520.761960.979
GreensboroPIT1161.0821941.470920.960
GreenvilleBOS1011.006960.9781061.029
HickoryTEX970.9851131.0651011.005
Hudson ValleyNYY1061.0291051.0241051.026
Jersey ShorePHI970.9871171.084990.993
RomeATL840.921510.753990.994
WilmingtonWSH1001.000950.977950.976
Winston-SalemCWS920.962810.905930.963

This league featured three parks—Aberdeen, Brooklyn, Hudson Valley—that were moving from the short-season New York-Penn League to full-season status.

High-A West

RunsHome RunsBABIP
TeamOrgPFMultPFMultPFMult
EugeneSF970.9851091.0451081.038
EverettSEA1211.1031521.2591121.058
HillsboroARI960.982740.869990.997
SpokaneCOL1311.1531731.363990.996
Tri-CityLAA810.905560.778940.970
VancouverTOR800.900610.803910.953

Because of issues crossing the border into Canada during the pandemic, Vancouver played its home schedule in Hillsboro, Ore., all season.

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Low-A East

RunsHome RunsBABIP
TeamOrgPFMultPFMultPFMult
AugustaATL940.9691131.063970.987
CarolinaMIL1151.0731241.1221071.037
CharlestonTB910.957900.950880.941
ColumbiaKC1161.0821311.1541031.014
DelmarvaBAL960.978940.972930.967
Down EastTEX940.9701051.023960.982
FayettevilleHOU910.953930.9631021.008
FredericksburgWSH1021.0091181.0891031.014
KannapolisCWS1071.035980.9901021.008
LynchburgCLE1151.0771331.1631031.013
Myrtle BeachCHC890.945760.8781011.003
SalemBOS960.980530.7641041.021

Low-A Southeast

RunsHome RunsBABIP
TeamOrgPFMultPFMultPFMult
BradentonPIT1111.0561651.3271011.007
ClearwaterPHI1151.0731261.1281011.007
DaytonaCIN910.954920.9601021.012
DunedinTOR870.934880.938930.967
Fort MyersMIN960.9791021.008950.974
JupiterMIA950.974760.881980.991
LakelandDET910.957800.902980.991
Palm BeachSTL890.945480.740950.977
St. LucieNYM1241.1191391.1931111.056
TampaNYY1071.0351071.0341051.023

Jupiter and Palm Beach both play home games at Roger Dean Stadium in Jupiter, an arrangement preserved from their Florida State League days.

Dunedin moved its home operations around the league while the Blue Jays played their games there early in the season.

Low-A West

RunsHome RunsBABIP
TeamOrgPFMultPFMultPFMult
FresnoCOL1161.0781451.223970.987
Inland EmpireLAA970.987870.9331061.030
Lake ElsinoreSD990.993650.826990.997
ModestoSEA910.957690.8451041.020
Rancho CucamongaLAD1051.0261151.075980.992
San JoseSF980.990770.8871021.011
StocktonOAK990.9931601.301900.952
VisaliaARI1001.0001091.0461041.021

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