If you're looking to hold vegetables hot after cooking, the general rule of thumb is to keep them at or above 140 degrees Fahrenheit. This will help to ensure that they retain both their flavor and their nutrients. There are, of course, some exceptions to this rule. For instance, softer vegetables like zucchini or tomatoes may only need to be held at around 120 degrees Fahrenheit in order to stay hot. And, on the other end of the spectrum, harder vegetables like potatoes can actually be held at slightly higher temperatures, around 150 degrees Fahrenheit, without sacrificing quality. Ultimately, it's important to use your best judgement when deciding what temperature to hold your cooked vegetables at. If you're unsure, err on the side of caution and keep them on the hotter side. That way, you can be sure that they'll stay both hot and delicious.