Marines typically wear their uniforms with the sleeves rolled up during warm weather months and with the sleeves down during cooler months. The specific date when Marines switch from wearing their uniforms with sleeves rolled up to sleeves down varies based on the geographic location and climate of their duty station.

In general, Marines at locations with colder climates will switch to wearing sleeves down earlier in the fall than Marines stationed in warmer locations. The exact date for the switch is typically determined by the commanding officer of each unit based on weather conditions and other factors.
The switch to sleeves down is often marked by a ceremony known as the “sleeve ceremony” or “sleeve roll-down.” During this ceremony, Marines roll down their uniform sleeves for the first time in several months as a symbol of the change in season and the transition to cooler weather.
The sleeve roll-down ceremony is typically a formal event, with Marines wearing their dress uniforms and standing at attention as their sleeves are rolled down. The ceremony may also include speeches by senior officers and other traditions specific to each unit.
It is important to note that the decision to roll sleeves up or down is not solely based on temperature. Other factors, such as the mission requirements of the unit and the personal preferences of the commanding officer, may also come into play.
Overall, the specific date when Marines go sleeves down can vary based on location and climate, but it is typically determined by the commanding officer of each unit. The sleeve roll-down ceremony is a formal event that marks the transition from warmer to cooler weather and is a symbol of the changing seasons.