A good tool for this is Stellarium. It lets you set your exact location, date, and time, then shows where astronomical objects will be in the sky, including planets, constellations, and the Milky Way. That makes it very useful for planning nightscape compositions in advance.

It’s also helpful to account for light pollution when choosing a shooting location. A light-pollution map or Google Earth overlay can help you compare potential sites and find darker skies before you go.

In practice, a solid workflow is:

1. Set your shooting location in Stellarium.
2. Dial in the planned date and time.
3. Check the position of the Milky Way, planets, and constellations.
4. Use a light-pollution map/overlay to confirm the site has dark enough skies.

That combination should let you plan both sky placement and location quality before your limited time on site.