All Closures and Refurbishments at Disneyland during March and October of 2017 and 2021

March 2017

Jan. 10 - Jul. 29Frontierland : Disneyland ParkRivers of America Attractions Disneyland Railroad and most Rivers of America attractions (including Fantasmic!) are closed temporarily to make room for the construction of the new Star Wars land. Pirate's Lair on Tom Sawyer Island has re-opened. Fantasmic! opens on July 17. Davy Crockett Explorer Canoes, Mark Twain Riverboat, Sailing Ship Columbia and Disneyland Railroad reopen on July 29.
Sep. 11 - Sep. 15Paradise Pier Hotel : HotelsParadise Pool and Spa Closed for refurbishment
Jan. 02 - May. 26Hollywood Land : Disney California AdventureNew Guardians of the Galaxy theme for the Tower of Terror The Tower of Terror will be re-imagined into a new Guardians of the Galaxy - Mission: BREAKOUT! attraction, scheduled to open on May 27,2017
Jan. 08 - Spring 2017Grand Californian : HotelsGrand California Pool Area Refurbishment All pools at the Grand Californian are closed while the entire pool and cabana area is refurbished. To minimize guest disruption, any activities that may create noise will not start before 9:00 a.m. Guests may use the pools and waterslides at the Paradise Pier Hotel and the Disneyland Hotel. Shuttle service from the entrance to the Grand Californian to the other resorts is available for those wishing to use the pools.
Jan. 08 - Fall 2017Grand Californian : HotelsRoom Refurbishments Rooms at the Grand Californian will be undergoing refurbishment through the fall of 2017.
Jan. 09 - Mar. 22Grizzly Peak : Disney California AdventureGrizzly River Run Closed for refurbishment
Feb. 03 - Mar. 15New Orleans Square : Disneyland ParkPirates of the Caribbean Closed February 3 for refurbishment.
Feb. 06 - Mar. 05Pixar Pier : Disney California AdventureMickey's Fun Wheel Closed for refurbishment.
Feb. 06 - Apr. 27Fantasyland : Disneyland ParkMatterhorn Bobsleds Closed for refurbishment and addition of Fastpass.
Feb. 21 - Mar. 05Pixar Pier : Disney California AdventureWorld of Color Closed for refurbishment.
Mar. 20 - Mar. 22Tomorrowland : Disneyland ParkAutopia Closed March 20-22 for refurbishment

October 2017

Jan. 08 - Fall 2017Grand Californian : HotelsRoom Refurbishments Rooms at the Grand Californian will be undergoing refurbishment through the fall of 2017.
Early August 2017 - Early OctoberGrand Californian : HotelsCraftsman's Club Concierge Lounge Relocation The concierge lounge will be temporarily relocated from early August through early October.
Aug. 2015 - May. 31Disneyland Park : Disneyland ResortStar Wars: Galaxy's Edge The 14-acre Star Wars-themed land that was announced during the 2015 D23 EXPO opens at Disneyland on May 31.
Aug. 21 - Dec. 20Pixar Pier : Disney California AdventureGoofy's Sky School Closed for refurbishment
Sep. 05 - Nov. 20Frontierland : Disneyland ParkRiver Belle Terrace Closed for refurbishment
Sep. 11 - Re-opening date not yet available.Condor Flats : Disney California AdventureSmokejumpers Grill Closed for refurbishment.
Oct. 01 - Oct. 08Disneyland Hotel : HotelsE-Ticket Pool Closed for refurbishment
Oct. 02 - Oct. 19Frontierland : Disneyland ParkBig Thunder Mountain Railroad Closed for refurbishment
Oct. 23 - Nov. 09Fantasyland : Disneyland Park"it's a small world" Closed for installation of holiday overlay
Oct. 23 - Nov. 02a bug's land : Disney California AdventureIt's Tough to be a Bug Closed for refurbishment

March 2021

May. 30 - No details availableDowntown Disney : Downtown DisneyDowntown Disney West End Closures The following Downtown Disney locations closed in preparation for the construction of a proposed new hotel which has since been canceled. No details on what might be going into the now available retail spaces.
 
AMC Theaters
ESPN Zone
Rainforest Cafe
2019 - Early 2023Disneyland Park : Disneyland ResortMickey & Minnie's Runaway Railway (DLR) The first major Mickey-themed ride-through attraction, is coming to Disneyland’s Mickey’s Toontown in Early 2023 as part of the reimagination of Mickey’s Toontown. The ride will be housed in the El CapiTOON Theater, where Mickey and Minnie are premiering their newest short, Perfect Picnic.
March 14th, 2020 - July 25th, 2022Disneyland Park : Disneyland ResortFinding Nemo Submarine Voyage Finding Nemo Submarine Voyage closed for refurbishment on March 14th, 2020. It will reopen on July 25th, 2022.

October 2021

2019 - Early 2023Disneyland Park : Disneyland ResortMickey & Minnie's Runaway Railway (DLR) The first major Mickey-themed ride-through attraction, is coming to Disneyland’s Mickey’s Toontown in Early 2023 as part of the reimagination of Mickey’s Toontown. The ride will be housed in the El CapiTOON Theater, where Mickey and Minnie are premiering their newest short, Perfect Picnic.
March 14th, 2020 - July 25th, 2022Disneyland Park : Disneyland ResortFinding Nemo Submarine Voyage Finding Nemo Submarine Voyage closed for refurbishment on March 14th, 2020. It will reopen on July 25th, 2022.
Oct. 4, 2021 - Nov. 10th, 2023Disneyland Park : Disneyland ResortTarzan's Treehouse Tarzan's Treehouse will close for refurbishment beginning October 4th, 2021. Disney has revealed that the attraction is being rethemed to an adapted version of the original Swiss Family Treehouse concept that Walt and his Imagineers envisioned in 1962.