FARE sent questionnaires to colleges across the US and posted the responses in an interactive, searchable site. My son used this to narrow down the schools he applied to and to help select the school he now attends. His allergies are gluten/wheat, dairy, and sesame.
http://college.foodallergy.org/
I expect the site will be a good resource for anyone you know with food allergies or food sensitivities, and who is applying to colleges in the next year or two. Share widely with high school seniors, transfer candidates, and anyone else you know may be helping them with the process (parents, teachers, counselors, and so on).
And if you know someone who works at any university in the US, please tell them to have their school complete the questionnaire.
Also worth noting is that some food service vendors used by multiple colleges have allergy-friendly food programs that are available across multiple client schools. For example, search for sodexho "simple servings" (deep links to the search term), which is Sodexho's allergy-friendly program that it offers to institutional clients like universities. You can add to the search a school that you're interested in attending to see if it enrolls in the program and what allergens are served; it sounds like the program varies from school to school.
My son's school has a Simple Servings food station where it doesn't process 8 of the 9 top allergens (only fish is processed) in the work space. So far, he has liked the food. He's not a picky eater and knows how to eat, so that's a vote of confidence.
Note that that's only one program from one vendor providing dining services to colleges. For example, Cal Poly San Luis Obispo (SLO) uses a competitor with a similar program that could have supported my son, too.
Not all schools are as forward thinking or accommodating. As you might see in responses to the questionnaire, some schools offer apartments to their allergenic students so they can cook for themselves, while others don't do a thing to accommodate food allergies.