Public baseball fields are great places to organize impromptu baseball games or practice. Baseball fields are available throughout the Boston area as part of the city's park system, and they can be used (first-come, first-served) by the public when not reserved.
Baseball field reservations in Boston are handled by the Parks and Recreation Department of the city (click here).

 

Cassidy Playground Allston-BrightonFreePark with Little league sports facility, Baseball, Tennis
Address: 379 Chestnut Hill Ave., Allston-Brighton
Hardiman Playground Allston-BrightonFreePark with Sports facility, Full basketball court, Baseball, Playground, Play structure for ages 2-12, Tot spray feature
Address: 380 Faneuil Street, Allston-Brighton
Ringer Playground Allston-BrightonFreePark with Sports facility, Baseball field, Tennis, Basketball, Playground and play structure for ages 2-12, Tot spray feature, Swings
Address: 85 Allston Street, Allston-Brighton
Rogers ParkAllston-BrightonFreePark with Sports facility, Baseball, Basketball, Tennis, Playground and play structure for ages 2-12
Address: 30 Rogers Park Avenue, Allston-Brighton
Smith Playground Allston-BrightonFreePark with Sports facility with multi use field, Softball, Baseball, Street hockey, Full basketball court, Playground and play structure for ages 2-12
Address: 235 Western Ave., Allston-Brighton
Ryan Playground CharlestownFreePark with Sports facility, Multi-use field, Softball, Baseball, Little league, Batting cage, Street hockey, Playground and play structure for ages 2-12, Swings
Address: 75 Alford Street, Charlestown
Doherty Playground DorchesterFreePark with Sports facility, Baseball, Batting cage, Basketball, Playground and play structure for ages 2-12, Swings
Address: 1545 Dorchester Ave., Dorchester
Dorchester ParkDorchesterFreePark with Sports facility, Baseball, Little league, Tennis, Playground and play structure for ages 2-12, Swings
Address: 2180 Dorchester Avenue, Dorchester
Garvey Playground DorchesterFreePark with Sports facility, Baseball, Basketball, Street hockey, Multi-use field, Playground and play structure for ages 2-12, Swings
Address: 340 Neponset Avenue, Dorchester
Hannon Playground DorchesterFreePark with Sports facility, Basketball, Baseball, Playground and play structure for ages 5-12
Address: 621 Dudley Street, Dorchester
Hemenway Playground DorchesterFreePark with Sports facility, Baseball, Basketball, Swings, Playground and play structure for ages 2-12
Address: 540 Adams Street, Dorchester
Mcconnell ParkDorchesterFreePark with Sports facility, Batting cage, Baseball, Playground and play structure for ages 2-12, Swings
Address: 30 Denny Street, Dorchester
Roberts Playground DorchesterFreePark with Playground and play structure for ages 2-12, Swings, Tot spray feature, Sports facility, Multi-use field, Baseball, Soccer, Football, Tennis, Swings for ages 2-5
Address: 56 Dunbar Avenue, Dorchester
Ronan ParkDorchesterFreePark with Sports facility, Baseball, Basketball, Playground and play structures for ages 2-5, Tot spray feature
Address: 92 Mt. Ida Road, Dorchester
Boston CommonDowntownFreePark with Public art, Playground and play structure for ages 5-12, Tot spray feature, Sports facility, Baseball, Tennis, Stage/amphitheater, Wifi
Address: 139 Tremont St (Visitor Info Center), Downtown
Langone Park DowntownFreePark with Sports facility, Baseball, (little league), Playground and play structure for ages 5-12
Address: 529-543 Commercial Street, Downtown
Puopolo PlaygroundDowntownFreePark with Sports facility, Bocce, Baseball, Batting cage, Public art, Playground and play structure for ages 2-12, Swings, Tot spray feature
Address: 517 Commercial Street, Downtown
East Boston Memorial ParkEast BostonFreePark with Playground, Play structure, And swings for ages 2-12, Tot spray, Sports facility, Multi-use field, Soccer, Baseball, Little league, Batting cage, Soccer, Tennis, Football, Track and field
Address: 143 Porter Street (Stadium), East Boston
Noyes Park East BostonFreePark with Playground and play structure for ages 2-12, Swings for ages 2-5, Sports facility, Baseball, Little league, Softball, Basketball
Address: 86 Boardman Street, East Boston
Back Bay FensFenway-KenmoreFreePark with Public art, Sports facility, Multi-use field, Baseball, Basketball, Football, Soccer, Track and field, Playground, Play structures for ages 2 - 12,
Address: 100 Park Drive (Clemente Field House), Fenway-Kenmore
Iacono Playground Hyde ParkFreePark with Sports facility, Baseball, Batting cage, Basketball, Tennis, Fitness station, Playground, Play structures for ages 2 - 12, Swings, Tot spray
Address: 150 Readville Street, Hyde Park
Ross Playground Hyde ParkFreePark with Sports facility, Tennis, Basketball, Street hockey, Softball, Baseball, Playground, Play structures for ages 2 - 12
Address: 145 Westminster Street, Hyde Park
English High School Ball FieldsJamaica PlainFreePark with Sports facility, Multi-use field, Football, Basketball, Soccer, Tennis, Baseball, Batting cage, Public art
Address: 20 Williams Street, Jamaica Plain
Mclaughlin Playground Jamaica PlainFreePark with Sports facility, Basketball, Baseball, Little league, Batting cage, Playground, Play structures for ages 2 - 12, Public art
Address: 239 Parker Hill Ave., Jamaica Plain
Mission Hill PlaygroundJamaica PlainFreePark with Playground, Play structures for ages 2 - 12, Swings, Tot spray, Sports facility, Soccer, Baseball
Address: 60 Smith Street, Jamaica Plain
Fallon FieldRoslindaleFreePark with Sports facility, Street hockey, Tennis, Baseball, Basketball, Playground, Play structures for ages 2 - 12, Swings
Address: 910 South Street, Roslindale
Healy Playground RoslindaleFreePark with Sports facility, Multi-use field, Basketball, Softball, Baseball, Little league, Playground, Play structures for ages 2 - 12
Address: 160 Florence Street, Roslindale
Clifford Playground RoxburyFreePark with Sports facility, Basketball, Tennis, Softball, Baseball, Little league, Playground, Play structures for ages 2 - 12, Swings, Public art
Address: 160 Norfolk Avenue, Roxbury
Madison Park High School Athletic FieldsRoxburyFreePark with Sports facility, Multi-use, Basketball, Tennis, Baseball, Batting cage, Track and field, Public art
Address: 55 Malcolm X Boulevard, Roxbury
Malcolm X ParkRoxburyFreePark with Sports facility, Tennis, Basketball, Little league, Baseball, Playground, Play structures for ages 2 - 12, Swings, Tot spray
Address: 150 M L King Jr. Boulevard, Roxbury
Christopher F. Lee PlaygroundSouth BostonFreePark with Sports facility, Basketball, Baseball, Little league, Playground, Play structure for ages 5 - 12
Address: 775 East First Street, South Boston
Moakley Park South BostonFreePark with Sports facility, Multi-use field, Basketball, Street hockey, Tennis, Soccer, Baseball, Softball, Little league, Batting cage, Track and field, Playground, Play structures for ages 2 - 12, Swings, Tot spray, Public art
Address: 1005 Columbia Road, South Boston
Orton FieldSouth BostonFreePark with Sports facility, Basketball, Baseball, Natural features, Community garden, Public art, Playgrounds, Play structures for ages 2 - 12, Tot spray,
Address: 200 D Street, South Boston
Ramsay Park South EndFreePark with Public art, Sports facility, Baseball, Basketball, Tennis, Playground, Play structures for ages 2 - 12, Swings
Address: 1917 Washington Street, South End
Rotch Playground South EndFreePark with Sports facility, Multi-use field, Soccer, Baseball, Public art
Address: 30 Randolph Street, South End
Billings FieldWest RoxburyFreePark with Sports facility, Multi-use field, Baseball, Little league, Basketball, Tennis, Playground, Play structures for ages 2 - 12, Swings, Tot spray
Address: 369 LaGrange Street, West Roxbury