The best roast of beans to make cold brew is a medium or dark roast.
Medium roast beans have a balanced flavor and acidity, which makes them a great choice for cold brew. They are less bitter than darker roasts, and have a fuller body and a richer taste than lighter roasts.
Dark roast beans have a bold and robust flavor, and have less acidity than medium roasts which is ideal for cold brew. They are also less bitter and have a more smooth and chocolatey flavor than lighter roasts. Both medium and dark roast beans are suitable for cold brew and it depends on personal taste and preference which one to use.