Please refer to the new Soucts BSA YPT regulations here: https://www.scouting.org/health-and-safety/gss/gss01/

All adults camping out with their units need to be registered with the BSA and complete YPT and weather hazard training. 

For Cub units, the ratio should be 1:1 (one adult per cub).

Cub units are not allowed to camp, but are allowed to stay the weekend if a heated building is reserved.