While there aren't any completely free museums in the city, thanks to the Scientific and Cultural Facilities District tax, most institutions do host free days, as well as some free evenings. And then there's Visit Denver's Night at the Museums during Denver Arts Week on Saturday, November 2.
Here are all the free museum days in Denver for the rest of the year:
Clyfford Still Museum
1250 Bannock Streetclyffordstillmuseum.org
Sunday, July 28
Saturday, November 2
Denver Art Museum
100 West 14th Avenue Parkwaydenverartmuseum.org
Tuesday, May 14
Tuesday, June 11
Tuesday, July 9
Sunday, July 21
Tuesday, August 13
Saturday, September 7
Tuesday, September 10
Tuesday, October 8
Saturday, November 2
Tuesday, November 12
Tuesday, December 10
Denver Botanic Gardens
1007 York Streetbotanicgardens.org
Wednesday, June 5
Wednesday, July 3
Wednesday, August 28
Friday, November 29
Denver Museum of Nature & Science
2001 Colorado Boulevarddmns.org
Tuesday, June 4, 5 to 9 p.m.
Wednesday, June 19
Wednesday, August 21, 5 to 9 p.m.
Tuesday, September 10, 5 to 9 p.m.
Monday, September 30
Sunday, October 20
Saturday, November 2, 5 to 9 p.m.
Monday, November 18
Sunday, December 8
Denver Zoo
2300 Steele Streetdenverzoo.org
A free day ticket reservation is required; visit the zoo's website to see how to register.
Sunday, November 3; tickets released on October 23
Saturday, November 9; tickets released on October 30
Sunday, November 17; tickets released on November 6
Four Mile Historic Park
715 South Forest Drivefourmilepark.org
Friday, May 24
Friday, June 28
Friday, July 26
Friday, August 23
Friday, September 27
Friday, October 25
Friday, November 22
History Colorado
1200 Broadwayhistorycolorado.org
Sunday, August 4
Saturday, November 2
Museum of Contemporary Art
1485 Delgany Streetmcadenver.org
The museum offers "Penny Saturdays" on the first Saturday of the month, when admission is one penny. Children and teens up to age eighteen are always allowed in free.
The SCFD extends far beyond Denver city limits, of course, and so do the free days. Find the complete lineup here.