The outdoor sillcock mounting kit is positioned around a pipe that is connected to a sillcock. The kit is utilized prior to adding finishing material to the outer wall of a home or building. The kit permits adjustments to the pipe and the sillcock when necessary due to a change in the dimensions of the finished material added to the outer wall, especially those outer finished walls that add brick, stucco, and other types of building materials. The kit has three components, two sleeves of the same basic shape and size except one sleeve is longer. The longer sleeve can be utilized with the third component, which is a block-shaped cover. The cover is utilized with rectangular-type finishing material on the outer wall, and fits over the longer sleeve.