Absolutely! In fact, I love a good cold tuna pasta pasta, served straight from the fridge. But room temperature works, too. Cover the dish with plastic wrap or transfer the salad to an airtight container, then store in the refrigerator. This salad can be made up to 2 days in advance, with a couple of caveats. The longer pasta salad rests, the more the pasta will absorb dressing. If making tuna pasta salad ahead of time, make extra dressing to toss with the salad right before dressing. Basil leaves start to brown after being sliced. I suggest slicing and adding the basil right before serving the salad.