Tuesdays
Brooklyn Botanic Garden - Free all day Tuesday, all year around (normally $8)
China Institute Gallery - free from 6 to 8 p.m. (normally $7)
Wave Hill Gardens - Free all day July–August (normally $6)
 

Wednesdays
Bronx Zoo - Admission by optional "donation" all day (new spring/summer rates are normally $15)
Museum of Jewish Heritage - A Living Memorial to the Holocaust - Free from 4 to 8 p.m. (normally $10)
NY Botanical Garden - Free grounds access all day (grounds-only access normally $6)
Van Cortlandt House Museum - free all day (normally $5)

Thursdays
New Museum - Free from 7 to 10 p.m. (normally $12)
China Institute Gallery - free from 6 to 8 p.m. (normally $7)

Fridays
Museum of Modern Art - Free from 4 to 8 p.m. (normally $20)
Whitney Museum of American Art - Pay-what-you-wish from 6 to 9 p.m. (normally $15)
Guggenheim - Pay-what-you-wish from 5:45 to 7:45 p.m. (normally $18)
International Center of Photography - "voluntary contribution" admission from 5 to 8 p.m. (normally $12)
Morgan Library & Museum - Free from 7 to 9 p.m. (normally $12)
New-York Historical Society - Free from 6 to 8 p.m. (normally $10)
Rubin Museum of Art - Free from 7 to 10 p.m. (normally $10)
South Street Seaport Museum - Free Fridays from 5 to 9 p.m. on the third Friday of each month, sometimes with free harbor sails (museum admission normally $10)
Folk Art Museum - Free from 5:30 to 7:30 p.m. (normally $9)
Children’s Museum of Manhattan - Free the first Friday of each month from 5 to 8 p.m. (normally $9)
Bronx Museum - Free noon to 8 p.m. (normally $5 suggested)
The Noguchi Museum - Pay-what-you-wish on the first Friday of each month, all day (normally $10)
Asia Society - Free 6 to 9 p.m., but free Fridays are suspended July 4 to Labor Day. (normally $10)
NY Hall of Science - Free 2 to 5 p.m., but only September through June (normally $11)
Brooklyn Botanic Garden - Free for seniors (normally $4 for seniors)
 

Saturdays
Jewish Museum - Free from 11:00 a.m. - 5:45 p.m. (normally $12)
NY Botanical Garden - Free grounds access from 10 a.m. to noon(grounds-only access normally $6)
Brooklyn Botanic Garden - Free from 10 a.m. to noon (normally $8)
Wave Hill - Free from 9 a.m. to noon (normally $6)
Brooklyn Museum - Free First Saturdays of most months from 5 to 11 p.m., but "© MURAKAMI" still costs $10 (normally a suggested $8)
New Museum - First Saturdays for Families offers free admission and events from 10 a.m. to noon with tickets given out on a first-come, first-served basis (museum admission normally $12

Sundays

Frick Collection - Pay-what-you-wish from 11 a.m. to 1 p.m. (normally $15)
Museum of the City of New York - Free from 10 a.m. to noon (normally a suggested $9)