The Rainy Daze was a psychedelic pop group formed in Denver, Colorado in 1965. They were composed of singer/guitarist Tim Gilbert with his brother Kip on drums, lead guitarist Mac Ferris, bassist Sam Fuller, and keyboardist Bob Heckendorf.

The group started as a covers act, nevertheless parlaying a string of frat party gigs into a local television appearance that reportedly caught the attention of famed producer Phil Spector, who extended a management contract.

The group released an album, That Acapulco Gold, and the title song (written by Tim Gilbert and his roommate, John Carter) made it to #70 on the Billboard Hot 100 in 1967 but was pulled once it was realized it was a pro-marijuana song (see Acapulco Gold). Tim Gilbert was co-author with John S. Carter of the gold record / "million seller" song Incense and Peppermints (song) by Strawberry Alarm Clock.

Kip Gilbert (born Christopher Gilbert) died of cancer on December 11, 2002, at age 57.

Sam Fuller (born Samuel Fuller in Denver on May 17, 1946) died of cancer on October 29, 2008, at age 62.