No, overnight parking is not allowed at Lake Louise. The parking lot is always open, so feel free to visit for stargazing, you just are not allowed to sleep in your vehicle.
People Also Ask
Technically yes, you can swim at Lake Louise, but it probably won't be for long. The water temperature rarely gets above 4°C, meaning you only have about 15 minutes or so until you become hypothermic.
Although there is no federal law against sleeping in a vehicle, staying in your car overnight is illegal in some states and cities. Laws about sleeping legally in your car vary across states, counties, and cities.